Microsoft : comment des hackers infiltrent les PC via WhatsApp sans laisser de trace \u00b7 tech.kouzay.com<\/title>\r\n \r\n \r\n <meta name=\"description\" content=\"L'\u00e9quipe Microsoft Defender Security Research r\u00e9v\u00e8le une nouvelle campagne de piratage : WhatsApp comme point d'entr\u00e9e, Windows comme terrain de jeu. 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<span class=\"badge\"><i class=\"fab fa-whatsapp\"><\/i> WhatsApp<\/span>\r\n <span class=\"badge\"><i class=\"fas fa-shield-alt\"><\/i> Microsoft Defender<\/span>\r\n <\/div>\r\n \r\n \r\n <div class=\"intro\">\r\n <p><strong>L'\u00e9quipe Microsoft Defender Security Research<\/strong> a publi\u00e9 une analyse technique d\u00e9taill\u00e9e d'une nouvelle campagne de piratage. Le constat est sans appel : <strong>WhatsApp est le principal point d'entr\u00e9e<\/strong>, et une cha\u00eene de techniques propres \u00e0 Windows rend l'attaque <strong>extr\u00eamement difficile \u00e0 d\u00e9tecter<\/strong>. D\u00e9couvrez comment op\u00e8rent les hackers et comment vous prot\u00e9ger.<\/p>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fab fa-whatsapp\"><\/i> 1. WhatsApp : la porte d'entr\u00e9e<\/h2>\r\n <div class=\"feature-list\">\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-envelope-open-text\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Un simple fichier .vbs<\/h3>\r\n <p>Tout commence par un <strong>message WhatsApp<\/strong> contenant un fichier <strong>.vbs<\/strong> (VBScript). VBScript est un langage de script int\u00e9gr\u00e9 nativement \u00e0 Windows, con\u00e7u pour automatiser des t\u00e2ches courantes. Son ex\u00e9cution est <strong>rarement pass\u00e9e au crible<\/strong> par les solutions de s\u00e9curit\u00e9 traditionnelles.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-bolt\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Une fois le fichier ouvert<\/h3>\r\n <p>La <strong>cha\u00eene d'infection se d\u00e9clenche<\/strong> sans autre action de la part de la victime. Le script cr\u00e9e des dossiers cach\u00e9s dans <strong>\"C:\\ProgramData\"<\/strong> et y copie des utilitaires Windows parfaitement l\u00e9gaux, renomm\u00e9s pour passer inaper\u00e7us.<\/p>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n \r\n <div class=\"simple-box info\">\r\n <p><strong>\ud83d\udccc Rappel :<\/strong> Mi-mars 2026, une alerte avait \u00e9t\u00e9 lanc\u00e9e en France sur les risques croissants li\u00e9s aux messageries instantan\u00e9es comme vecteurs d'attaque. Cette campagne confirme ce constat.<\/p>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fab fa-windows\"><\/i> 2. Windows : le terrain de jeu<\/h2>\r\n \r\n <div class=\"attack-schema\">\r\n <p><strong>\ud83d\udd10 Sch\u00e9ma de l'attaque (Living-off-the-land)<\/strong><\/p>\r\n <div class=\"schema-step\">\r\n <span class=\"step\"><i class=\"fab fa-whatsapp\"><\/i> Fichier .vbs<\/span>\r\n <span class=\"arrow\"><i class=\"fas fa-arrow-right\"><\/i><\/span>\r\n <span class=\"step\"><i class=\"fas fa-folder\"><\/i> Dossiers cach\u00e9s<\/span>\r\n <span class=\"arrow\"><i class=\"fas fa-arrow-right\"><\/i><\/span>\r\n <span class=\"step\"><i class=\"fas fa-tools\"><\/i> Outils d\u00e9tourn\u00e9s<\/span>\r\n <span class=\"arrow\"><i class=\"fas fa-arrow-right\"><\/i><\/span>\r\n <span class=\"step\"><i class=\"fas fa-cloud\"><\/i> Cloud C2<\/span>\r\n <\/div>\r\n <\/div>\r\n \r\n <div class=\"feature-list\">\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-code\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Des outils Windows d\u00e9tourn\u00e9s<\/h3>\r\n <p>Les hackers renomment des utilitaires l\u00e9gitimes pour les rendre moins suspects :<\/p>\r\n <div class=\"code-block\">\r\n curl.exe \u2192 renomm\u00e9 \"netapi.dll\"<br>\r\n bitsadmin.exe \u2192 renomm\u00e9 \"sc.exe\"\r\n <\/div>\r\n <p>Ces outils se connectent ensuite \u00e0 des services cloud (<strong>AWS S3, Tencent Cloud, Backblaze B2<\/strong>) pour r\u00e9cup\u00e9rer des charges malveillantes suppl\u00e9mentaires.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-leaf\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>\"Living-off-the-land\" (exploiter ce qui existe)<\/h3>\r\n <p>C'est la technique cl\u00e9 : <strong>exploiter ce qui est d\u00e9j\u00e0 pr\u00e9sent sur le syst\u00e8me<\/strong>, plut\u00f4t que d'introduire des outils d'embl\u00e9e suspects. Depuis un pare-feu, le trafic ressemble \u00e0 des \u00e9changes normaux. Rien n'alerte.<\/p>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-shield-alt\"><\/i> 3. Contournement de l'UAC (Contr\u00f4le de Compte Utilisateur)<\/h2>\r\n <div class=\"simple-box warning\">\r\n <p><strong>\ud83d\udd34 L'UAC : le verrou que les hackers font sauter<\/strong><\/p>\r\n <p>L'UAC est cens\u00e9 avertir l'utilisateur quand un programme cherche \u00e0 obtenir des droits d'administrateur. Le malware modifie une valeur du registre Windows :<\/p>\r\n <div class=\"code-block\">\r\n \"ConsentPromptBehaviorAdmin\"\r\n <\/div>\r\n <p>Cette modification <strong>d\u00e9sactive les alertes<\/strong>. Le malware relance ensuite <strong>cmd.exe en boucle<\/strong> jusqu'\u00e0 obtenir les privil\u00e8ges administrateur n\u00e9cessaires.<\/p>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-toolbox\"><\/i> 4. L'arsenal d\u00e9ploy\u00e9<\/h2>\r\n <div class=\"feature-list\">\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-desktop\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Des logiciels l\u00e9gitimes d\u00e9tourn\u00e9s<\/h3>\r\n <p>Avec les droits \u00e9lev\u00e9s, les attaquants installent des <strong>paquets MSI sans signature num\u00e9rique<\/strong> :<\/p>\r\n <ul style=\"margin-top: 0.5rem; margin-left: 1.2rem;\">\r\n <li><strong>AnyDesk.msi<\/strong> : outil de prise en main \u00e0 distance<\/li>\r\n <li><strong>WinRAR.msi<\/strong> : gestionnaire d'archives<\/li>\r\n <li><strong>LinkPoint.msi<\/strong> : autre outil de connexion<\/li>\r\n <\/ul>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-door-open\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Un acc\u00e8s permanent au PC<\/h3>\r\n <p>Cet arsenal permet aux hackers d'<strong>ouvrir un acc\u00e8s permanent<\/strong> au poste infect\u00e9, d'<strong>exfiltrer des donn\u00e9es<\/strong> ou de <strong>d\u00e9ployer d'autres logiciels malveillants<\/strong> \u00e0 volont\u00e9.<\/p>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-eye-slash\"><\/i> 5. La technique qui trompe les antivirus<\/h2>\r\n <div class=\"simple-box info\">\r\n <p><strong>\ud83d\udd0d Le champ \"OriginalFileName\" : le d\u00e9tail qui change tout<\/strong><\/p>\r\n <p>Microsoft souligne un point crucial : chaque ex\u00e9cutable Windows embarque dans ses m\u00e9tadonn\u00e9es un champ appel\u00e9 <strong>\"OriginalFileName\"<\/strong> \u2014 le nom d'origine du fichier, inscrit \u00e0 la compilation. <strong>Renommer le fichier ne modifie pas cette valeur.<\/strong><\/p>\r\n <p>Un antivirus capable de d\u00e9tecter <strong>l'\u00e9cart entre le nom affich\u00e9 et le nom d'origine<\/strong> peut identifier la menace. De m\u00eame, une suite de s\u00e9curit\u00e9 capable d'<strong>analyser le trafic r\u00e9seau<\/strong> est essentielle.<\/p>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-shield-alt\"><\/i> 6. Comment vous prot\u00e9ger ?<\/h2>\r\n \r\n <div class=\"feature-list\">\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-check-circle\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>1. M\u00e9fiez-vous des fichiers .vbs sur WhatsApp<\/h3>\r\n <p>M\u00eame si le message vient d'un contact connu, <strong>n'ouvrez pas<\/strong> un fichier .vbs que vous n'avez pas demand\u00e9. Contactez la personne par un autre canal pour v\u00e9rifier.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-database\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>2. Utilisez un antivirus moderne<\/h3>\r\n <p>Les solutions de s\u00e9curit\u00e9 capables d'<strong>analyser le trafic r\u00e9seau<\/strong> et de d\u00e9tecter les \u00e9carts de m\u00e9tadonn\u00e9es (comme Microsoft Defender) sont essentielles. Assurez-vous qu'il est actif et \u00e0 jour.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-chart-line\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>3. Surveillez les connexions sortantes<\/h3>\r\n <p>Un pare-feu qui alerte sur des connexions vers <strong>AWS S3, Tencent Cloud ou Backblaze B2<\/strong> peut vous sauver. Ces services cloud sont utilis\u00e9s par les hackers pour t\u00e9l\u00e9charger leurs charges utiles.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-user-lock\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>4. Activez la double authentification WhatsApp<\/h3>\r\n <p>Dans les param\u00e8tres de WhatsApp, activez la <strong>v\u00e9rification en deux \u00e9tapes<\/strong>. Cela limitera les risques si vos identifiants sont vol\u00e9s.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fab fa-windows\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>5. Gardez Windows \u00e0 jour<\/h3>\r\n <p>Microsoft a mis \u00e0 jour Windows Defender pour d\u00e9tecter ce type de menace. <strong>Installez les derni\u00e8res mises \u00e0 jour de s\u00e9curit\u00e9.<\/strong><\/p>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-ambulance\"><\/i> 7. Que faire si vous pensez avoir \u00e9t\u00e9 infect\u00e9 ?<\/h2>\r\n <div class=\"simple-box success\">\r\n <p><strong>\u2705 Les bons r\u00e9flexes :<\/strong><\/p>\r\n <ul style=\"margin-top: 0.5rem; margin-left: 1.2rem;\">\r\n <li><strong>D\u00e9connectez imm\u00e9diatement votre PC d'Internet<\/strong> (coupez le Wi-Fi ou le c\u00e2ble r\u00e9seau)<\/li>\r\n <li><strong>Scannez avec un antivirus \u00e0 jour<\/strong> (Windows Defender, Malwarebytes, etc.)<\/li>\r\n <li><strong>Changez tous vos mots de passe<\/strong> (email, banque, r\u00e9seaux sociaux) depuis un autre appareil sain<\/li>\r\n <li><strong>V\u00e9rifiez votre compte WhatsApp<\/strong> : Param\u00e8tres \u2192 Appareils li\u00e9s, d\u00e9connectez tout appareil inconnu<\/li>\r\n <li><strong>Pr\u00e9venez vos contacts<\/strong> qu'ils ont peut-\u00eatre re\u00e7u un message suspect de votre part<\/li>\r\n <\/ul>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-check-circle\"><\/i> 8. En r\u00e9sum\u00e9<\/h2>\r\n <div class=\"simple-box\">\r\n <p><strong>\u2705 Ce qu'il faut retenir de l'analyse Microsoft :<\/strong><\/p>\r\n <ul style=\"margin-top: 0.5rem; margin-left: 1.2rem;\">\r\n <li>L'attaque commence par un <strong>fichier .vbs re\u00e7u sur WhatsApp<\/strong><\/li>\r\n <li>Les hackers exploitent des <strong>outils Windows l\u00e9gitimes<\/strong> (technique du \"living-off-the-land\")<\/li>\r\n <li>Ils <strong>contournent l'UAC<\/strong> en modifiant le registre Windows<\/li>\r\n <li>Ils installent <strong>AnyDesk, WinRAR et LinkPoint<\/strong> pour prendre le contr\u00f4le permanent du PC<\/li>\r\n <li>La cl\u00e9 pour d\u00e9tecter l'attaque : surveiller <strong>l'\u00e9cart entre le nom affich\u00e9 et \"OriginalFileName\"<\/strong> des ex\u00e9cutables<\/li>\r\n <li><strong>Prot\u00e9gez-vous<\/strong> : m\u00e9fiance, antivirus \u00e0 jour, double authentification WhatsApp<\/li>\r\n <\/ul>\r\n <\/div>\r\n \r\n \r\n <div class=\"keywords\">\r\n <span>WhatsApp piratage<\/span>\r\n <span>Microsoft Defender<\/span>\r\n <span>VBScript malware<\/span>\r\n <span>living off the land<\/span>\r\n <span>contournement UAC<\/span>\r\n <span>AnyDesk piratage<\/span>\r\n <span>s\u00e9curit\u00e9 Windows<\/span>\r\n <span>OriginalFileName<\/span>\r\n <span>cloud C2<\/span>\r\n <span>cybers\u00e9curit\u00e9<\/span>\r\n <\/div>\r\n \r\n <footer>\r\n tech.kouzay.com \u00b7 Cybers\u00e9curit\u00e9 \u00b7 Avril 2026 \u00b7 Source : Microsoft Defender Security Research\r\n <\/footer>\r\n<\/div>\r\n<\/body>\r\n<\/html>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>L’\u00e9quipe Microsoft Defender r\u00e9v\u00e8le une nouvelle attaque : WhatsApp comme point d’entr\u00e9e, Windows comme terrain de jeu. VBScript, contournement UAC, AnyDesk. D\u00e9couvrez comment vous prot\u00e9ger.<\/p>\n","protected":false},"author":2,"featured_media":6255,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[189,190,194,204,272,208,210,213,221,270,228,229],"tags":[],"class_list":["post-6250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil","category-actualites","category-blog-guides","category-consommateurs-high-tech","category-cybersecurite","category-cybersecurite-vpn","category-dossier","category-entrepreneurs-tech","category-high-tech-saas","category-ia","category-logiciels","category-logiciels-saas-b2b-b2c"],"jetpack_featured_media_url":"https:\/\/tech.kouzay.com\/wp-content\/uploads\/2026\/04\/whatsapp-web-kouzay.webp","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/posts\/6250","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/comments?post=6250"}],"version-history":[{"count":7,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/posts\/6250\/revisions"}],"predecessor-version":[{"id":6258,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/posts\/6250\/revisions\/6258"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/media\/6255"}],"wp:attachment":[{"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/media?parent=6250"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/categories?post=6250"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/tags?post=6250"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

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\n\t\t\t\t\t\r\n\r\n\r\n \r\n \r\n Microsoft : comment des hackers infiltrent les PC via WhatsApp sans laisser de trace \u00b7 tech.kouzay.com<\/title>\r\n \r\n \r\n <meta name=\"description\" content=\"L'\u00e9quipe Microsoft Defender Security Research r\u00e9v\u00e8le une nouvelle campagne de piratage : WhatsApp comme point d'entr\u00e9e, Windows comme terrain de jeu. D\u00e9couvrez l'attaque et comment vous prot\u00e9ger.\">\r\n <meta name=\"keywords\" content=\"WhatsApp, piratage, Microsoft Defender, VBScript, UAC contournement, living off the land, AnyDesk, s\u00e9curit\u00e9 Windows, attaque informatique, cybers\u00e9curit\u00e9\">\r\n \r\n <link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\r\n <link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\r\n <link href=\"https:\/\/fonts.googleapis.com\/css2?family=Inter:opsz,wght@14..32,400;14..32,500;14..32,600;14..32,700&display=swap\" rel=\"stylesheet\">\r\n <link rel=\"stylesheet\" href=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/font-awesome\/6.0.0-beta3\/css\/all.min.css\">\r\n \r\n <style>\r\n * {\r\n margin: 0;\r\n padding: 0;\r\n box-sizing: border-box;\r\n }\r\n body {\r\n font-family: 'Inter', sans-serif;\r\n background: #f5f7fc;\r\n color: #1a2c3e;\r\n line-height: 1.5;\r\n }\r\n .container {\r\n max-width: 1000px;\r\n margin: 0 auto;\r\n padding: 2rem 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border-radius: 24px;\r\n padding: 1.5rem;\r\n margin-bottom: 2rem;\r\n box-shadow: 0 2px 8px rgba(0,0,0,0.03);\r\n border: 1px solid #e9edf2;\r\n }\r\n .intro p {\r\n font-size: 1rem;\r\n color: #2c3e66;\r\n }\r\n .highlight {\r\n background: #075E54;\r\n color: white;\r\n padding: 0.1rem 0.3rem;\r\n border-radius: 8px;\r\n font-weight: 600;\r\n }\r\n .simple-box {\r\n background: #fef5f5;\r\n border-radius: 20px;\r\n padding: 1.2rem;\r\n margin: 1rem 0;\r\n border-left: 4px solid #dc2626;\r\n }\r\n .simple-box.warning {\r\n background: #fffbeb;\r\n border-left-color: #f59e0b;\r\n }\r\n .simple-box.success {\r\n background: #ecfdf5;\r\n border-left-color: #10b981;\r\n }\r\n .simple-box.info {\r\n background: #e0f2f1;\r\n border-left-color: #128C7E;\r\n }\r\n .feature-list {\r\n display: flex;\r\n flex-direction: column;\r\n gap: 1rem;\r\n margin: 1rem 0;\r\n }\r\n .feature-item {\r\n background: white;\r\n border-radius: 20px;\r\n padding: 1rem 1.2rem;\r\n border: 1px solid #eef2f8;\r\n display: flex;\r\n gap: 1rem;\r\n align-items: flex-start;\r\n }\r\n .feature-icon {\r\n font-size: 1.6rem;\r\n min-width: 45px;\r\n text-align: center;\r\n color: #075E54;\r\n }\r\n .feature-text p {\r\n color: #3a4c66;\r\n font-size: 0.9rem;\r\n }\r\n .attack-schema {\r\n background: #1e2a3a;\r\n border-radius: 20px;\r\n padding: 1.2rem;\r\n margin: 1rem 0;\r\n color: white;\r\n text-align: center;\r\n }\r\n .schema-step {\r\n display: flex;\r\n justify-content: center;\r\n align-items: center;\r\n gap: 1rem;\r\n flex-wrap: wrap;\r\n margin: 1rem 0;\r\n }\r\n .step {\r\n background: #2d3e5a;\r\n padding: 0.5rem 1rem;\r\n border-radius: 40px;\r\n font-size: 0.85rem;\r\n }\r\n .arrow {\r\n font-size: 1.2rem;\r\n color: #128C7E;\r\n }\r\n .code-block {\r\n background: #1e2a3a;\r\n color: #a5d6ff;\r\n padding: 0.8rem;\r\n border-radius: 12px;\r\n font-family: monospace;\r\n font-size: 0.8rem;\r\n margin: 0.5rem 0;\r\n overflow-x: auto;\r\n }\r\n .keywords {\r\n display: flex;\r\n flex-wrap: wrap;\r\n gap: 0.5rem;\r\n margin: 2rem 0 1rem;\r\n }\r\n .keywords span {\r\n background: #eef2f8;\r\n padding: 0.2rem 1rem;\r\n border-radius: 30px;\r\n font-size: 0.75rem;\r\n color: #2c4c6c;\r\n }\r\n footer {\r\n border-top: 1px solid #e2e8f0;\r\n margin-top: 2rem;\r\n padding-top: 1.5rem;\r\n font-size: 0.8rem;\r\n color: #5f6f84;\r\n text-align: center;\r\n }\r\n @media (max-width: 600px) {\r\n .feature-item {\r\n flex-direction: column;\r\n align-items: center;\r\n text-align: center;\r\n }\r\n .schema-step {\r\n flex-direction: column;\r\n }\r\n .arrow {\r\n transform: rotate(90deg);\r\n }\r\n }\r\n <\/style>\r\n<\/head>\r\n<body>\r\n<div class=\"container\">\r\n \r\n <h1>Microsoft : comment des hackers infiltrent les PC via WhatsApp sans laisser de trace<\/h1>\r\n <div class=\"meta\">\r\n <span><i class=\"far fa-calendar-alt\"><\/i> Avril 2026<\/span>\r\n <span><i class=\"fab fa-microsoft\"><\/i> tech.kouzay.com \u00b7 Cybers\u00e9curit\u00e9<\/span>\r\n <span class=\"badge\"><i class=\"fab fa-whatsapp\"><\/i> WhatsApp<\/span>\r\n <span class=\"badge\"><i class=\"fas fa-shield-alt\"><\/i> Microsoft Defender<\/span>\r\n <\/div>\r\n \r\n \r\n <div class=\"intro\">\r\n <p><strong>L'\u00e9quipe Microsoft Defender Security Research<\/strong> a publi\u00e9 une analyse technique d\u00e9taill\u00e9e d'une nouvelle campagne de piratage. Le constat est sans appel : <strong>WhatsApp est le principal point d'entr\u00e9e<\/strong>, et une cha\u00eene de techniques propres \u00e0 Windows rend l'attaque <strong>extr\u00eamement difficile \u00e0 d\u00e9tecter<\/strong>. D\u00e9couvrez comment op\u00e8rent les hackers et comment vous prot\u00e9ger.<\/p>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fab fa-whatsapp\"><\/i> 1. WhatsApp : la porte d'entr\u00e9e<\/h2>\r\n <div class=\"feature-list\">\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-envelope-open-text\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Un simple fichier .vbs<\/h3>\r\n <p>Tout commence par un <strong>message WhatsApp<\/strong> contenant un fichier <strong>.vbs<\/strong> (VBScript). VBScript est un langage de script int\u00e9gr\u00e9 nativement \u00e0 Windows, con\u00e7u pour automatiser des t\u00e2ches courantes. Son ex\u00e9cution est <strong>rarement pass\u00e9e au crible<\/strong> par les solutions de s\u00e9curit\u00e9 traditionnelles.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-bolt\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Une fois le fichier ouvert<\/h3>\r\n <p>La <strong>cha\u00eene d'infection se d\u00e9clenche<\/strong> sans autre action de la part de la victime. Le script cr\u00e9e des dossiers cach\u00e9s dans <strong>\"C:\\ProgramData\"<\/strong> et y copie des utilitaires Windows parfaitement l\u00e9gaux, renomm\u00e9s pour passer inaper\u00e7us.<\/p>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n \r\n <div class=\"simple-box info\">\r\n <p><strong>\ud83d\udccc Rappel :<\/strong> Mi-mars 2026, une alerte avait \u00e9t\u00e9 lanc\u00e9e en France sur les risques croissants li\u00e9s aux messageries instantan\u00e9es comme vecteurs d'attaque. Cette campagne confirme ce constat.<\/p>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fab fa-windows\"><\/i> 2. Windows : le terrain de jeu<\/h2>\r\n \r\n <div class=\"attack-schema\">\r\n <p><strong>\ud83d\udd10 Sch\u00e9ma de l'attaque (Living-off-the-land)<\/strong><\/p>\r\n <div class=\"schema-step\">\r\n <span class=\"step\"><i class=\"fab fa-whatsapp\"><\/i> Fichier .vbs<\/span>\r\n <span class=\"arrow\"><i class=\"fas fa-arrow-right\"><\/i><\/span>\r\n <span class=\"step\"><i class=\"fas fa-folder\"><\/i> Dossiers cach\u00e9s<\/span>\r\n <span class=\"arrow\"><i class=\"fas fa-arrow-right\"><\/i><\/span>\r\n <span class=\"step\"><i class=\"fas fa-tools\"><\/i> Outils d\u00e9tourn\u00e9s<\/span>\r\n <span class=\"arrow\"><i class=\"fas fa-arrow-right\"><\/i><\/span>\r\n <span class=\"step\"><i class=\"fas fa-cloud\"><\/i> Cloud C2<\/span>\r\n <\/div>\r\n <\/div>\r\n \r\n <div class=\"feature-list\">\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-code\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Des outils Windows d\u00e9tourn\u00e9s<\/h3>\r\n <p>Les hackers renomment des utilitaires l\u00e9gitimes pour les rendre moins suspects :<\/p>\r\n <div class=\"code-block\">\r\n curl.exe \u2192 renomm\u00e9 \"netapi.dll\"<br>\r\n bitsadmin.exe \u2192 renomm\u00e9 \"sc.exe\"\r\n <\/div>\r\n <p>Ces outils se connectent ensuite \u00e0 des services cloud (<strong>AWS S3, Tencent Cloud, Backblaze B2<\/strong>) pour r\u00e9cup\u00e9rer des charges malveillantes suppl\u00e9mentaires.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-leaf\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>\"Living-off-the-land\" (exploiter ce qui existe)<\/h3>\r\n <p>C'est la technique cl\u00e9 : <strong>exploiter ce qui est d\u00e9j\u00e0 pr\u00e9sent sur le syst\u00e8me<\/strong>, plut\u00f4t que d'introduire des outils d'embl\u00e9e suspects. Depuis un pare-feu, le trafic ressemble \u00e0 des \u00e9changes normaux. Rien n'alerte.<\/p>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-shield-alt\"><\/i> 3. Contournement de l'UAC (Contr\u00f4le de Compte Utilisateur)<\/h2>\r\n <div class=\"simple-box warning\">\r\n <p><strong>\ud83d\udd34 L'UAC : le verrou que les hackers font sauter<\/strong><\/p>\r\n <p>L'UAC est cens\u00e9 avertir l'utilisateur quand un programme cherche \u00e0 obtenir des droits d'administrateur. Le malware modifie une valeur du registre Windows :<\/p>\r\n <div class=\"code-block\">\r\n \"ConsentPromptBehaviorAdmin\"\r\n <\/div>\r\n <p>Cette modification <strong>d\u00e9sactive les alertes<\/strong>. Le malware relance ensuite <strong>cmd.exe en boucle<\/strong> jusqu'\u00e0 obtenir les privil\u00e8ges administrateur n\u00e9cessaires.<\/p>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-toolbox\"><\/i> 4. L'arsenal d\u00e9ploy\u00e9<\/h2>\r\n <div class=\"feature-list\">\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-desktop\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Des logiciels l\u00e9gitimes d\u00e9tourn\u00e9s<\/h3>\r\n <p>Avec les droits \u00e9lev\u00e9s, les attaquants installent des <strong>paquets MSI sans signature num\u00e9rique<\/strong> :<\/p>\r\n <ul style=\"margin-top: 0.5rem; margin-left: 1.2rem;\">\r\n <li><strong>AnyDesk.msi<\/strong> : outil de prise en main \u00e0 distance<\/li>\r\n <li><strong>WinRAR.msi<\/strong> : gestionnaire d'archives<\/li>\r\n <li><strong>LinkPoint.msi<\/strong> : autre outil de connexion<\/li>\r\n <\/ul>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-door-open\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>Un acc\u00e8s permanent au PC<\/h3>\r\n <p>Cet arsenal permet aux hackers d'<strong>ouvrir un acc\u00e8s permanent<\/strong> au poste infect\u00e9, d'<strong>exfiltrer des donn\u00e9es<\/strong> ou de <strong>d\u00e9ployer d'autres logiciels malveillants<\/strong> \u00e0 volont\u00e9.<\/p>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-eye-slash\"><\/i> 5. La technique qui trompe les antivirus<\/h2>\r\n <div class=\"simple-box info\">\r\n <p><strong>\ud83d\udd0d Le champ \"OriginalFileName\" : le d\u00e9tail qui change tout<\/strong><\/p>\r\n <p>Microsoft souligne un point crucial : chaque ex\u00e9cutable Windows embarque dans ses m\u00e9tadonn\u00e9es un champ appel\u00e9 <strong>\"OriginalFileName\"<\/strong> \u2014 le nom d'origine du fichier, inscrit \u00e0 la compilation. <strong>Renommer le fichier ne modifie pas cette valeur.<\/strong><\/p>\r\n <p>Un antivirus capable de d\u00e9tecter <strong>l'\u00e9cart entre le nom affich\u00e9 et le nom d'origine<\/strong> peut identifier la menace. De m\u00eame, une suite de s\u00e9curit\u00e9 capable d'<strong>analyser le trafic r\u00e9seau<\/strong> est essentielle.<\/p>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-shield-alt\"><\/i> 6. Comment vous prot\u00e9ger ?<\/h2>\r\n \r\n <div class=\"feature-list\">\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-check-circle\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>1. M\u00e9fiez-vous des fichiers .vbs sur WhatsApp<\/h3>\r\n <p>M\u00eame si le message vient d'un contact connu, <strong>n'ouvrez pas<\/strong> un fichier .vbs que vous n'avez pas demand\u00e9. Contactez la personne par un autre canal pour v\u00e9rifier.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-database\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>2. Utilisez un antivirus moderne<\/h3>\r\n <p>Les solutions de s\u00e9curit\u00e9 capables d'<strong>analyser le trafic r\u00e9seau<\/strong> et de d\u00e9tecter les \u00e9carts de m\u00e9tadonn\u00e9es (comme Microsoft Defender) sont essentielles. Assurez-vous qu'il est actif et \u00e0 jour.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-chart-line\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>3. Surveillez les connexions sortantes<\/h3>\r\n <p>Un pare-feu qui alerte sur des connexions vers <strong>AWS S3, Tencent Cloud ou Backblaze B2<\/strong> peut vous sauver. Ces services cloud sont utilis\u00e9s par les hackers pour t\u00e9l\u00e9charger leurs charges utiles.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fas fa-user-lock\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>4. Activez la double authentification WhatsApp<\/h3>\r\n <p>Dans les param\u00e8tres de WhatsApp, activez la <strong>v\u00e9rification en deux \u00e9tapes<\/strong>. Cela limitera les risques si vos identifiants sont vol\u00e9s.<\/p>\r\n <\/div>\r\n <\/div>\r\n <div class=\"feature-item\">\r\n <div class=\"feature-icon\"><i class=\"fab fa-windows\"><\/i><\/div>\r\n <div class=\"feature-text\">\r\n <h3>5. Gardez Windows \u00e0 jour<\/h3>\r\n <p>Microsoft a mis \u00e0 jour Windows Defender pour d\u00e9tecter ce type de menace. <strong>Installez les derni\u00e8res mises \u00e0 jour de s\u00e9curit\u00e9.<\/strong><\/p>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-ambulance\"><\/i> 7. Que faire si vous pensez avoir \u00e9t\u00e9 infect\u00e9 ?<\/h2>\r\n <div class=\"simple-box success\">\r\n <p><strong>\u2705 Les bons r\u00e9flexes :<\/strong><\/p>\r\n <ul style=\"margin-top: 0.5rem; margin-left: 1.2rem;\">\r\n <li><strong>D\u00e9connectez imm\u00e9diatement votre PC d'Internet<\/strong> (coupez le Wi-Fi ou le c\u00e2ble r\u00e9seau)<\/li>\r\n <li><strong>Scannez avec un antivirus \u00e0 jour<\/strong> (Windows Defender, Malwarebytes, etc.)<\/li>\r\n <li><strong>Changez tous vos mots de passe<\/strong> (email, banque, r\u00e9seaux sociaux) depuis un autre appareil sain<\/li>\r\n <li><strong>V\u00e9rifiez votre compte WhatsApp<\/strong> : Param\u00e8tres \u2192 Appareils li\u00e9s, d\u00e9connectez tout appareil inconnu<\/li>\r\n <li><strong>Pr\u00e9venez vos contacts<\/strong> qu'ils ont peut-\u00eatre re\u00e7u un message suspect de votre part<\/li>\r\n <\/ul>\r\n <\/div>\r\n \r\n \r\n <h2><i class=\"fas fa-check-circle\"><\/i> 8. En r\u00e9sum\u00e9<\/h2>\r\n <div class=\"simple-box\">\r\n <p><strong>\u2705 Ce qu'il faut retenir de l'analyse Microsoft :<\/strong><\/p>\r\n <ul style=\"margin-top: 0.5rem; margin-left: 1.2rem;\">\r\n <li>L'attaque commence par un <strong>fichier .vbs re\u00e7u sur WhatsApp<\/strong><\/li>\r\n <li>Les hackers exploitent des <strong>outils Windows l\u00e9gitimes<\/strong> (technique du \"living-off-the-land\")<\/li>\r\n <li>Ils <strong>contournent l'UAC<\/strong> en modifiant le registre Windows<\/li>\r\n <li>Ils installent <strong>AnyDesk, WinRAR et LinkPoint<\/strong> pour prendre le contr\u00f4le permanent du PC<\/li>\r\n <li>La cl\u00e9 pour d\u00e9tecter l'attaque : surveiller <strong>l'\u00e9cart entre le nom affich\u00e9 et \"OriginalFileName\"<\/strong> des ex\u00e9cutables<\/li>\r\n <li><strong>Prot\u00e9gez-vous<\/strong> : m\u00e9fiance, antivirus \u00e0 jour, double authentification WhatsApp<\/li>\r\n <\/ul>\r\n <\/div>\r\n \r\n \r\n <div class=\"keywords\">\r\n <span>WhatsApp piratage<\/span>\r\n <span>Microsoft Defender<\/span>\r\n <span>VBScript malware<\/span>\r\n <span>living off the land<\/span>\r\n <span>contournement UAC<\/span>\r\n <span>AnyDesk piratage<\/span>\r\n <span>s\u00e9curit\u00e9 Windows<\/span>\r\n <span>OriginalFileName<\/span>\r\n <span>cloud C2<\/span>\r\n <span>cybers\u00e9curit\u00e9<\/span>\r\n <\/div>\r\n \r\n <footer>\r\n tech.kouzay.com \u00b7 Cybers\u00e9curit\u00e9 \u00b7 Avril 2026 \u00b7 Source : Microsoft Defender Security Research\r\n <\/footer>\r\n<\/div>\r\n<\/body>\r\n<\/html>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>L’\u00e9quipe Microsoft Defender r\u00e9v\u00e8le une nouvelle attaque : WhatsApp comme point d’entr\u00e9e, Windows comme terrain de jeu. VBScript, contournement UAC, AnyDesk. D\u00e9couvrez comment vous prot\u00e9ger.<\/p>\n","protected":false},"author":2,"featured_media":6255,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[189,190,194,204,272,208,210,213,221,270,228,229],"tags":[],"class_list":["post-6250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil","category-actualites","category-blog-guides","category-consommateurs-high-tech","category-cybersecurite","category-cybersecurite-vpn","category-dossier","category-entrepreneurs-tech","category-high-tech-saas","category-ia","category-logiciels","category-logiciels-saas-b2b-b2c"],"jetpack_featured_media_url":"https:\/\/tech.kouzay.com\/wp-content\/uploads\/2026\/04\/whatsapp-web-kouzay.webp","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/posts\/6250","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/comments?post=6250"}],"version-history":[{"count":7,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/posts\/6250\/revisions"}],"predecessor-version":[{"id":6258,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/posts\/6250\/revisions\/6258"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/media\/6255"}],"wp:attachment":[{"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/media?parent=6250"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/categories?post=6250"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tech.kouzay.com\/index.php\/wp-json\/wp\/v2\/tags?post=6250"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}