{"id":25024,"date":"2025-10-29T07:55:19","date_gmt":"2025-10-29T07:55:19","guid":{"rendered":"https:\/\/www.stroople.com\/?p=25024"},"modified":"2025-10-29T08:10:38","modified_gmt":"2025-10-29T08:10:38","slug":"phishing-caracteres-invisibles-double-face-objet-de-lemail","status":"publish","type":"post","link":"https:\/\/www.stroople.com\/fr\/phishing-invisible-characters-double-faced-email-subject\/","title":{"rendered":"Alerte au phishing par objet de mail \u00e0 double visage"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"25024\" class=\"elementor elementor-25024\" wpc-filter-elementor-widget=\"1\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-75a7e495 elementor-section-full_width elementor-section-height-default elementor-section-height-default syd-sticky-section-no\" data-id=\"75a7e495\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-379ca332 syd-sticky-section-no\" data-id=\"379ca332\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c67689e syd-sticky-section-no elementor-widget elementor-widget-spacer\" data-id=\"c67689e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3b2c3dd elementor-section-full_width elementor-section-height-min-height elementor-section-items-stretch elementor-reverse-tablet elementor-section-height-default syd-sticky-section-no\" data-id=\"3b2c3dd\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-4002b263 syd-sticky-section-no\" data-id=\"4002b263\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4d0edb4 syd-sticky-section-no elementor-widget elementor-widget-ha-social-icons happy-addon ha-social-icons\" data-id=\"4d0edb4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"ha-social-icons.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"ha-social-icons-wrapper \">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.linkedin.com\/build-relation\/newsletter-follow?entityUrn=7120442855684231170\" class=\"ha-social-icon elementor-repeater-item-f2b3d32  elementor-social-icon-linkedin ha-social-icon--network\">\n\t\t\t\t\t<i class=\"fab fa-linkedin\"><\/i>\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-7af1deef syd-sticky-section-no\" data-id=\"7af1deef\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1e11c0f0 syd-sticky-section-no elementor-widget elementor-widget-post-info\" data-id=\"1e11c0f0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-5b276ce elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.stroople.com\/fr\/2025\/10\/29\/\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-date\">\n\t\t\t\t\t\t\t\t\t\t<time>octobre 29, 2025<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-42127c4d syd-sticky-section-no elementor-widget elementor-widget-theme-post-title elementor-page-title elementor-widget-heading\" data-id=\"42127c4d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"theme-post-title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Alert: Phishing through Double-Faced Email Subjects<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f87f821 elementor-section-boxed elementor-section-height-default elementor-section-height-default syd-sticky-section-no\" data-id=\"f87f821\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0e53a75 syd-sticky-section-no\" data-id=\"0e53a75\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3deb2ab0 syd-sticky-section-no elementor-widget elementor-widget-theme-post-featured-image elementor-widget-image\" data-id=\"3deb2ab0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"theme-post-featured-image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"2368\" height=\"1792\" src=\"https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing.jpg\" class=\"attachment-full size-full wp-image-25026\" alt=\"\" srcset=\"https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing.jpg 2368w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-300x227.jpg 300w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-1024x775.jpg 1024w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-768x581.jpg 768w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-1536x1162.jpg 1536w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-2048x1550.jpg 2048w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-16x12.jpg 16w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-1000x757.jpg 1000w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-230x174.jpg 230w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-350x265.jpg 350w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-480x363.jpg 480w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/Phishing-1320x999.jpg 1320w\" sizes=\"(max-width: 2368px) 100vw, 2368px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ae97c8b syd-sticky-section-no elementor-widget elementor-widget-spacer\" data-id=\"ae97c8b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-064f662 elementor-section-boxed elementor-section-height-default elementor-section-height-default syd-sticky-section-no\" data-id=\"064f662\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-496d655 syd-sticky-section-no\" data-id=\"496d655\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-15e5835 syd-sticky-section-no elementor-widget elementor-widget-spacer\" data-id=\"15e5835\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-02b8cb4 syd-sticky-section-no elementor-widget elementor-widget-text-editor\" data-id=\"02b8cb4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"font-weight: 400;\"><strong>From soft hyphens to homographs \u2014 same battle: normalize, decode, correlate, and educate.<\/strong><\/p><p style=\"font-weight: 400;\">You scan your inbox. A subject line appears: \u201cYour password is about to expire.\u201d Impeccable, flawless, perfectly credible. When opened, everything seems normal. Yet this email is a trap: the subject line contains invisible characters inserted to deceive both the human eye and, above all, automated filtering systems. Much like homograph attacks, where visually similar characters replace letters in a domain name or URL to create confusion, this stratagem exploits the subtleties of Unicode to deceive both human perception and machine analysis.<\/p><p style=\"font-weight: 400;\">This silent trick in the email header marks a strategic evolution of phishing: the attacker no longer hides only the URL, they fragment the very text that security filters rely on. Here\u2019s how it works, why it\u2019s dangerous, and what you should do immediately to protect your organization.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-94434b5 syd-sticky-section-no\" data-id=\"94434b5\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-04dc3a0 syd-sticky-section-no elementor-widget elementor-widget-image\" data-id=\"04dc3a0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.stroople.com\/wp-content\/uploads\/elementor\/thumbs\/Phishing-rdwrrw49tm5upnff2wywxrow5nnu1zlg9oafhm138g.jpg\" title=\"Phishing\" alt=\"Alert: Phishing through Double-Faced Email Subjects\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8e67fb7 elementor-section-boxed elementor-section-height-default elementor-section-height-default syd-sticky-section-no\" data-id=\"8e67fb7\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d6117cb syd-sticky-section-no\" data-id=\"d6117cb\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8b259f3 syd-sticky-section-no elementor-widget elementor-widget-heading\" data-id=\"8b259f3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">1.What Experts Discovered<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-10ca4bd syd-sticky-section-no elementor-widget elementor-widget-text-editor\" data-id=\"10ca4bd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Researchers from the Internet Storm Center observed a malicious email whose subject line appeared strange in the Outlook message list but looked perfectly normal once opened.<\/span><\/p><p style=\"font-weight: 400;\">The analysis of the headers revealed a subject line split into two encoded parts:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8e3b505 syd-sticky-section-no elementor-widget elementor-widget-image\" data-id=\"8e3b505\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"81\" src=\"https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-1024x81.png\" class=\"attachment-large size-large wp-image-25027\" alt=\"\" srcset=\"https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-1024x81.png 1024w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-300x24.png 300w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-768x61.png 768w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-18x1.png 18w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-1000x79.png 1000w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-230x18.png 230w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-350x28.png 350w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-480x38.png 480w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts-1320x105.png 1320w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/a-subject-line-split-into-two-encoded-parts.png 1490w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d26421d syd-sticky-section-no elementor-widget elementor-widget-text-editor\" data-id=\"d26421d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"font-weight: 400;\">This format, known as encoded-word RFC 2047, is a method used to send special characters within emails (often via Base64 encoding). Once decoded, the visible text read \u201cYour Password is About to Expire,\u201d but soft hyphens (U+00AD), invisible hyphenation marks, had been added between the letters. These characters disrupt filters without being visible to the user.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8cad096 syd-sticky-section-no elementor-widget elementor-widget-image\" data-id=\"8cad096\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"606\" height=\"306\" src=\"https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/encoded-word-.png\" class=\"attachment-large size-large wp-image-25028\" alt=\"\" srcset=\"https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/encoded-word-.png 606w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/encoded-word--300x151.png 300w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/encoded-word--18x9.png 18w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/encoded-word--230x116.png 230w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/encoded-word--350x177.png 350w, https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/10\/encoded-word--480x242.png 480w\" sizes=\"(max-width: 606px) 100vw, 606px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-44c9cdd syd-sticky-section-no elementor-widget elementor-widget-text-editor\" data-id=\"44c9cdd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"font-weight: 400;\">Credit: Internet Storm Center<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f951086 syd-sticky-section-no elementor-widget elementor-widget-heading\" data-id=\"f951086\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">2.How This Attack Works<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-956f21f syd-sticky-section-no elementor-widget elementor-widget-text-editor\" data-id=\"956f21f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Imagine an email header like the address on an envelope. Normally, it\u2019s written in plain text. Here, the attacker slips in a \u201ccoded\u201d writing mode defined by email standards, known as an encoded-word. It\u2019s a legitimate mechanism under RFC 2047, originally designed to properly handle accents or non-Latin alphabets. It wraps the subject line into a small technical package \u2014 like folding a note inside the address field.<\/p><p style=\"font-weight: 400;\">Inside that package, the text is written in UTF-8, the universal alphabet of the Internet, then compressed in Base64 so it travels without distortion. When the email client displays it, it unfolds the package and shows a normal-looking subject line.<\/p><p style=\"font-weight: 400;\">That\u2019s where the trick happens. The attacker inserts fake characters called soft hyphens (Unicode code U+00AD) between letters. These are invisible markers used to suggest where a word could be broken if it wrapped onto the next line. In a normal email, they aren\u2019t displayed, the text looks perfectly fine.<\/p><p style=\"font-weight: 400;\">But in the underlying code, those characters remain. A word like <em>password<\/em> becomes, in reality, <em>p-a-s-s-w-o-r-d<\/em>, with invisible breaks between letters. The user sees a normal word, but automated filters no longer recognize the keyword. Detection rules based on known trigger words simply fail, the message slips right through.<\/p><p style=\"font-weight: 400;\">By combining encoded-word packaging (RFC 2047), UTF-8 encoding, and soft hyphen insertion, the attacker creates a double-faced subject line: clear and convincing to humans, fragmented and unrecognizable to keyword-based detection engines.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-118c8bd syd-sticky-section-no elementor-widget elementor-widget-heading\" data-id=\"118c8bd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">3.Why It\u2019s a Concern<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9781e44 syd-sticky-section-no elementor-widget elementor-widget-text-editor\" data-id=\"9781e44\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Traditional detection rules can no longer identify sensitive words like \u201cpassword,\u201d \u201caccount,\u201d or \u201curgent.\u201d The message header itself becomes an evasion vector, often ignored by filters. As a result, phishing campaigns become more effective, particularly those targeting credential theft or business account compromise.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5f4fa09 syd-sticky-section-no elementor-widget elementor-widget-heading\" data-id=\"5f4fa09\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">4.How to Protect Effectively<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2278ed5 syd-sticky-section-no elementor-widget elementor-widget-text-editor\" data-id=\"2278ed5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"font-weight: 400;\"><strong>4.1 Mail Gateway Rules (MTA \/ MTA-AV \/ CASB)<\/strong><\/p><ol><li><strong>Systematic decoding of encoded headers:<\/strong> Before inspection, decode all <strong>RFC 2047 encoded-words<\/strong> in Subject, From, and Reply-To fields, then analyze the decoded version (e.g., raw header \u2192 decode \u2192 normalize \u2192 scan).<\/li><li><strong>Invisible character detection:<\/strong> In the decoded version, look for suspicious Unicode format characters \u2014 at minimum <strong>U+00AD (soft hyphen)<\/strong>,\u00a0<strong>U+200B (zero-width space)<\/strong>, <strong>U+200C\/200D (ZWNJ\/ZWJ)<\/strong>. If they appear in large numbers (threshold to define), tag or quarantine the message.<\/li><li><strong>Alert signatures and regex examples:<\/strong><ul><li>Detect presence of encoded-words in Subject: =\\?[^?]+\\?[BbQq]\\?[A-Za-z0-9+\/=]+\\?=<\/li><li>After decoding, detect soft hyphen: look for\\u00AD or hex\\xAD<\/li><li>Combined rule: Subject matches encoded-word AND decoded contains U+00AD \u2192 HIGH severity<\/li><\/ul><\/li><li><strong>Sanitization before display:<\/strong> Strip invisible characters from the subject shown to users and display a notice if the original version differed (e.g., banner: \u201cSubject modified by the mail gateway for security reasons\u201d).<\/li><li><strong>Conditional blocking:<\/strong> If the decoded Subject contains more than N format-control characters\u00a0<em>and<\/em>the body contains external URLs, automatically quarantine the message (e.g., N \u2265 3).<\/li><\/ol><p style=\"font-weight: 400;\"><strong>4.2 SIEM \/ SOC Rules<\/strong><\/p><ul style=\"font-weight: 400;\"><li><strong>MTA log ingestion:<\/strong> Index events such as \u201csubject_decoded_contains_invisible\u201d as structured fields.<\/li><li><strong>Correlated alerting:<\/strong>\u00a0Combine detection of an altered Subject with any webproxy connection to a credential-harvesting domain \u2192 High priority.<\/li><li><strong>Incident playbook updates:<\/strong> Include account isolation, mailbox log collection, link forensics, and session invalidation in case of compromise.<\/li><\/ul><p style=\"font-weight: 400;\"><strong>4.3 Endpoint and Web Proxy Detection<\/strong><\/p><p style=\"font-weight: 400;\">Block or sandbox domains hosting credential-harvesting pages (for example: <em>stopsoriasis[.]co[.]il\/Webmail\/webmail.php<\/em>), log all access attempts, and correlate them with email filter alerts.<\/p><ol start=\"6\"><li style=\"font-weight: 400;\"><strong> Practical Tests and Exercises<\/strong><\/li><li><strong>Technical test:<\/strong> Send a few RFC 2047-encoded emails containing soft hyphens (U+00AD) and confirm they\u2019re decoded, detected, and logged by the mail gateway and SIEM.<\/li><li><strong>User simulation:<\/strong> Launch a small internal phishing simulation and measure reporting vs. click rates.<\/li><li><strong>False positive check:<\/strong> Ensure that removing invisible characters doesn\u2019t affect legitimate messages (names with accents, non-Latin characters, etc.).<\/li><li><strong>Mail-to-web correlation:<\/strong>Simulate a click to a controlled test domain and verify that the SOC playbook is triggered.<\/li><\/ol><p style=\"font-weight: 400;\">Phishing attacks using invisible characters in email subject lines show that security is no longer only about the content of emails \u2014 it\u2019s also about their structure. Much like homograph attacks, which exploit visually similar characters in domains or URLs to mislead users, these new tactics rely on the hidden complexity of Unicode to evade both human scrutiny and machine detection.<\/p><p style=\"font-weight: 400;\">By systematically decoding headers, detecting invisible characters, and educating users, organizations can eliminate this risk before it spreads.<\/p><p style=\"font-weight: 400;\">Threats now evolve in the silence of code \u2014 we must learn to see what our eyes cannot.<\/p><p style=\"font-weight: 400;\"><strong>Source:<\/strong> <a href=\"https:\/\/isc.sans.edu\/diary\/A+phishing+with+invisible+characters+in+the+subject+line\/32428\">Internet Storm Center \u2013 A phishing with invisible characters in the subject line<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0d45597 syd-sticky-section-no elementor-widget elementor-widget-spacer\" data-id=\"0d45597\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-42f879c9 elementor-section-boxed elementor-section-height-default elementor-section-height-default syd-sticky-section-no\" data-id=\"42f879c9\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-2c8bfc12 syd-sticky-section-no\" data-id=\"2c8bfc12\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6919a471 syd-sticky-section-no elementor-widget elementor-widget-heading\" data-id=\"6919a471\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Share:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-7f905bc1 syd-sticky-section-no\" data-id=\"7f905bc1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-28b6f900 elementor-share-buttons--skin-flat elementor-share-buttons--view-icon-text elementor-share-buttons--shape-square elementor-grid-0 elementor-share-buttons--color-official syd-sticky-section-no elementor-widget elementor-widget-share-buttons\" data-id=\"28b6f900\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;share_url&quot;:{&quot;url&quot;:&quot;https:\\\/\\\/www.stroople.com\\\/phishing-invisible-characters-double-faced-email-subject&quot;,&quot;is_external&quot;:&quot;&quot;,&quot;nofollow&quot;:&quot;&quot;,&quot;custom_attributes&quot;:&quot;&quot;}}\" data-widget_type=\"share-buttons.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-grid\" role=\"list\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_x-twitter\" role=\"button\" tabindex=\"0\" aria-label=\"Share on x-twitter\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<i class=\"fab fa-x-twitter\" aria-hidden=\"true\"><\/i>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-share-btn__text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__title\">\n\t\t\t\t\t\t\t\t\t\tX\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_linkedin\" role=\"button\" tabindex=\"0\" aria-label=\"Share on linkedin\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<i class=\"fab fa-linkedin\" aria-hidden=\"true\"><\/i>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-share-btn__text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__title\">\n\t\t\t\t\t\t\t\t\t\tLinkedIn\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-cf1fb15 elementor-section-boxed elementor-section-height-default elementor-section-height-default syd-sticky-section-no\" data-id=\"cf1fb15\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-12d5d76 syd-sticky-section-no\" data-id=\"12d5d76\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e19b717 syd-sticky-section-no elementor-widget elementor-widget-spacer\" data-id=\"e19b717\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-eef88fd elementor-section-stretched elementor-section-boxed elementor-section-height-default elementor-section-height-default syd-sticky-section-no\" data-id=\"eef88fd\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;stretch_section&quot;:&quot;section-stretched&quot;,&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-c0ccf91 syd-sticky-section-no\" data-id=\"c0ccf91\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div data-ha-element-link=\"{&quot;url&quot;:&quot;https:\\\/\\\/www.stroople.com\\\/audit\\\/&quot;,&quot;is_external&quot;:&quot;&quot;,&quot;nofollow&quot;:&quot;&quot;}\" style=\"cursor: pointer\" class=\"elementor-element elementor-element-3419c3a elementor-widget__width-initial syd-sticky-section-no elementor-widget elementor-widget-ha-image-hover-effect happy-addon ha-image-hover-effect\" data-id=\"3419c3a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"ha-image-hover-effect.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"ha-ihe-wrapper grid\">\n\t\t\t<figure class=\"ha-ihe-fig ha-effect-apollo\">\n\t\t\t\t<img decoding=\"async\" class=\"ha-ihe-img\" src=\"https:\/\/www.stroople.com\/wp-content\/uploads\/2025\/08\/rostislav-uzunov-3G03lBTzjA8-unsplash.jpg\" alt=\"Image hover effect image\" \/>\n\t\t\t\t<figcaption class=\"ha-ihe-caption\">\n\t\t\t\t\t\t\t\t\t\t\t<h2 class=\"ha-ihe-title\">External Attack Surface Audit &amp; Monitoring<\/h2>\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"ha-ihe-desc\">\nKnow what hackers see. Fix it. Watch it.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.stroople.com\/audit\/\"  target=&quot;_blank&quot; rel=&quot;nofollow&quot;><\/a>\n\t\t\t\t\t\t\t\t\t<\/figcaption>\n\t\t\t<\/figure>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-33ef498 syd-sticky-section-no\" data-id=\"33ef498\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div data-ha-element-link=\"{&quot;url&quot;:&quot;https:\\\/\\\/www.stroople.com\\\/audit\\\/&quot;,&quot;is_external&quot;:&quot;&quot;,&quot;nofollow&quot;:&quot;&quot;}\" style=\"cursor: pointer\" class=\"elementor-element elementor-element-70e6ede syd-sticky-section-no elementor-widget elementor-widget-counter\" data-id=\"70e6ede\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"counter.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-counter\">\n\t\t\t\t\t\t<div class=\"elementor-counter-number-wrapper\">\n\t\t\t\t<span class=\"elementor-counter-number-prefix\"><\/span>\n\t\t\t\t<span class=\"elementor-counter-number\" data-duration=\"2000\" data-to-value=\"75\" data-from-value=\"0\" data-delimiter=\",\">0<\/span>\n\t\t\t\t<span class=\"elementor-counter-number-suffix\">%<\/span>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-08910c5 syd-sticky-section-no elementor-widget elementor-widget-text-editor\" data-id=\"08910c5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>of successful breaches start from publicly exposed assets.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7652aef elementor-section-stretched elementor-section-boxed elementor-section-height-default elementor-section-height-default syd-sticky-section-no\" data-id=\"7652aef\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;stretch_section&quot;:&quot;section-stretched&quot;,&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ed0df97 syd-sticky-section-no\" data-id=\"ed0df97\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-14be053 syd-sticky-section-no elementor-widget elementor-widget-spacer\" data-id=\"14be053\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5e63e1f elementor-section-boxed elementor-section-height-default elementor-section-height-default syd-sticky-section-no\" data-id=\"5e63e1f\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6502000 syd-sticky-section-no\" data-id=\"6502000\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-67d7aa6 syd-sticky-section-no elementor-widget elementor-widget-spacer\" data-id=\"67d7aa6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2655d51e elementor-widget-divider--view-line_text elementor-widget-divider--element-align-right syd-sticky-section-no elementor-widget elementor-widget-divider\" data-id=\"2655d51e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div 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Vous consultez votre bo\u00eete de r\u00e9ception. Une ligne d\u2019objet appara\u00eet : \u201c Votre<\/p>","protected":false},"author":1,"featured_media":25026,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-25024","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security-operations-soc-detection"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Alert: Phishing through Double-Faced Email Subjects - Stroople<\/title>\n<meta name=\"description\" content=\"Learn how phishing invisible characters email subject tricks bypass spam filters and deceive users. 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