{"id":24890,"date":"2026-07-31T08:15:30","date_gmt":"2026-07-31T08:15:30","guid":{"rendered":"https:\/\/windowsreport.com\/fr\/arnaques-au-support-informatique-via-microsoft-teams-menent-a-des-attaques-du-ransomware-chaos\/"},"modified":"2026-07-31T08:15:30","modified_gmt":"2026-07-31T08:15:30","slug":"arnaques-au-support-informatique-via-microsoft-teams-menent-a-des-attaques-du-ransomware-chaos","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/fr\/arnaques-au-support-informatique-via-microsoft-teams-menent-a-des-attaques-du-ransomware-chaos\/","title":{"rendered":"Arnaques au support informatique via Microsoft Teams m\u00e8nent \u00e0 des attaques du ransomware Chaos"},"content":{"rendered":"\n

Des acteurs de menace se font passer pour des techniciens du support informatique d\u2019entreprise sur Microsoft Teams afin d\u2019obtenir un acc\u00e8s \u00e0 distance aux appareils des employ\u00e9s et de d\u00e9ployer le ransomware Chaos.<\/p>\n\n\n\n

Sophos suit la campagne sous le nom STAC4749<\/a>. L\u2019entreprise de s\u00e9curit\u00e9 a observ\u00e9 des dizaines de tentatives d\u2019attaques contre des organisations aux \u00c9tats-Unis et au Canada entre f\u00e9vrier et juin 2026. Au moins trois incidents se sont sold\u00e9s par le chiffrement de fichiers par le ransomware.<\/p>\n\n\n\n

Des attaquants se font passer pour le personnel informatique sur Microsoft Teams<\/h2>\n\n\n\n

Les attaquants contactaient les employ\u00e9s via des comptes Microsoft Teams externes. Lors de conversations et d\u2019appels vocaux, ils se pr\u00e9sentaient comme des techniciens du support ou des membres du service informatique de l\u2019entreprise.<\/p>\n\n\n\n

Ils affirmaient ensuite avoir besoin d\u2019acc\u00e9der \u00e0 l\u2019ordinateur de l\u2019employ\u00e9 pour r\u00e9soudre un probl\u00e8me technique. Leur objectif \u00e9tait d\u2019amener la cible \u00e0 approuver une session de support \u00e0 distance sans v\u00e9rifier la demande via un canal interne.<\/p>\n\n\n\n

D\u00e8s qu\u2019un employ\u00e9 acceptait la demande, les attaquants obtenaient un acc\u00e8s direct \u00e0 l\u2019appareil et commen\u00e7aient \u00e0 installer des outils suppl\u00e9mentaires.<\/p>\n\n\n\n

RemSupp remplace l\u2019Assistance rapide Microsoft dans les attaques ult\u00e9rieures<\/h3>\n\n\n\n

Les premi\u00e8res versions de la campagne s\u2019appuyaient fortement sur l\u2019Assistance rapide de Microsoft, une fonctionnalit\u00e9 l\u00e9gitime de Windows qui permet \u00e0 une autre personne de visualiser ou de contr\u00f4ler un ordinateur \u00e0 distance.<\/p>\n\n\n\n

Lorsque l\u2019Assistance rapide \u00e9tait bloqu\u00e9e ou indisponible, les attaquants demandaient aux victimes d\u2019installer d\u2019autres logiciels de gestion \u00e0 distance. Ils se sont de plus en plus appuy\u00e9s sur le service cloud RemSupp \u00e0 partir du mois d\u2019avril.<\/p>\n\n\n\n

Sophos pense que RemSupp est peut-\u00eatre devenu l\u2019option privil\u00e9gi\u00e9e parce que moins de listes de blocage d\u2019applications d\u2019entreprise le reconnaissaient. L\u2019utilisation d\u2019un logiciel de support \u00e0 distance l\u00e9gitime aidait \u00e9galement les attaquants \u00e0 \u00e9viter de d\u00e9ployer des outils manifestement malveillants lors de la premi\u00e8re \u00e9tape de l\u2019attaque.<\/p>\n\n\n\n

PowerShell t\u00e9l\u00e9charge une porte d\u00e9rob\u00e9e persistante<\/h3>\n\n\n\n

Apr\u00e8s avoir obtenu un acc\u00e8s \u00e0 distance, les attaquants ont utilis\u00e9 des commandes PowerShell pour t\u00e9l\u00e9charger une porte d\u00e9rob\u00e9e dans le dossier %AppData% de la victime.<\/p>\n\n\n\n

Le logiciel malveillant collectait des informations sur le syst\u00e8me compromis, cr\u00e9ait des m\u00e9canismes de persistance et conservait l\u2019acc\u00e8s apr\u00e8s la fin de la session Teams ou de la session de support \u00e0 distance initiale.<\/p>\n\n\n\n

Pour donner \u00e0 l\u2019activit\u00e9 une apparence l\u00e9gitime, les attaquants cr\u00e9aient des entr\u00e9es de registre dont les noms ressemblaient \u00e0 des composants audio de Windows. Les noms observ\u00e9s comprenaient Realtek HD Audio, Realtek Audio UHD et WinAudio life2.<\/p>\n\n\n\n

Ces entr\u00e9es permettaient au malware de d\u00e9marrer automatiquement tout en rendant plus difficile pour les employ\u00e9s et les administrateurs l\u2019identification du processus suspect.<\/p>\n\n\n\n

Les attaquants installent plusieurs outils d\u2019acc\u00e8s \u00e0 distance<\/h3>\n\n\n\n

Lors des incidents qui ont \u00e9volu\u00e9 vers un ransomware, le groupe a install\u00e9 des applications d\u2019acc\u00e8s \u00e0 distance suppl\u00e9mentaires, notamment DWAgent et AnyDesk.<\/p>\n\n\n\n

Ces outils fournissaient un acc\u00e8s de secours si les d\u00e9fenseurs interrompaient la connexion d\u2019origine. Les attaquants ont \u00e9galement tent\u00e9 d\u2019activer le Protocole Bureau \u00e0 distance, ce qui pourrait les aider \u00e0 acc\u00e9der \u00e0 d\u2019autres syst\u00e8mes et \u00e0 se d\u00e9placer sur le r\u00e9seau de l\u2019entreprise.<\/p>\n\n\n\n

Sophos a observ\u00e9 des changements r\u00e9p\u00e9t\u00e9s dans la cha\u00eene d\u2019attaque entre f\u00e9vrier et mai. Les op\u00e9rateurs ajustaient leurs outils, commandes et m\u00e9thodes de persistance \u00e0 mesure que les produits de s\u00e9curit\u00e9 commen\u00e7aient \u00e0 d\u00e9tecter les versions ant\u00e9rieures.<\/p>\n\n\n\n

Le ransomware Chaos a chiffr\u00e9 plusieurs syst\u00e8mes \u00e0 la fois<\/h3>\n\n\n\n

Au moins trois attaques STAC4749 ont abouti au d\u00e9ploiement du ransomware Chaos. Lors de ces incidents, le ransomware a chiffr\u00e9 des fichiers sur plusieurs ordinateurs compromis \u00e0 peu pr\u00e8s au m\u00eame moment.<\/p>\n\n\n\n

Des preuves provenant d\u2019au moins une attaque sugg\u00e8rent que le groupe pourrait avoir vol\u00e9 des donn\u00e9es d\u2019entreprise avant de commencer le chiffrement. Cela permettrait aux attaquants de faire pression sur la victime en combinant l\u2019exposition des donn\u00e9es et la perturbation du syst\u00e8me.<\/p>\n\n\n\n

Sophos estime que la campagne est motiv\u00e9e par des gains financiers. Les op\u00e9rateurs peuvent d\u00e9ployer eux-m\u00eames le ransomware ou fournir un acc\u00e8s \u00e0 des affili\u00e9s ransomware distincts apr\u00e8s avoir compromis un r\u00e9seau.<\/p>\n\n\n\n

D\u2019autres groupes de menace ont \u00e9galement utilis\u00e9 Microsoft Teams pour de l\u2019ing\u00e9nierie sociale. Le groupe MuddyWater, soutenu par l\u2019\u00c9tat iranien, a utilis\u00e9 Teams et de fausses activit\u00e9s de ransomware pour dissimuler des op\u00e9rations d\u2019espionnage.<\/p>\n\n\n\n

Des campagnes li\u00e9es \u00e0 Chaos ont \u00e9galement utilis\u00e9 d\u2019autres techniques. Dans une op\u00e9ration distincte, le ransomware Chaos a utilis\u00e9 msaRAT pour d\u00e9guiser le trafic malveillant \u00e0 l\u2019int\u00e9rieur de Chrome et Edge.<\/p>\n\n\n\n

Comment les organisations peuvent bloquer les attaques de vishing via Teams<\/h3>\n\n\n\n

Les entreprises devraient limiter les communications Microsoft Teams externes ou surveiller \u00e9troitement les messages et les appels provenant de comptes ext\u00e9rieurs \u00e0 l\u2019organisation.<\/p>\n\n\n\n

Les employ\u00e9s ne devraient jamais approuver une demande de support \u00e0 distance inattendue sans la confirmer par une m\u00e9thode de contact interne officielle. Les services informatiques devraient \u00e9galement expliquer clairement quels outils leurs techniciens utilisent et comment les demandes d\u2019assistance l\u00e9gitimes commencent.<\/p>\n\n\n\n

Les \u00e9quipes de s\u00e9curit\u00e9 devraient bloquer ou restreindre l\u2019Assistance rapide, RemSupp, AnyDesk, DWAgent et les logiciels similaires sur les syst\u00e8mes qui n\u2019ont pas besoin d\u2019administration \u00e0 distance.<\/p>\n\n\n\n

Les organisations doivent surveiller toute activit\u00e9 PowerShell inhabituelle, y compris les t\u00e9l\u00e9chargements inattendus ou les commandes encod\u00e9es, ainsi que l\u2019installation d\u2019applications de gestion \u00e0 distance nouvelles ou non autoris\u00e9es. Ces comportements peuvent indiquer qu\u2019un attaquant a obtenu un acc\u00e8s initial et tente d\u2019\u00e9tablir le contr\u00f4le d\u2019un syst\u00e8me.<\/p>\n\n\n\n

Ils doivent \u00e9galement surveiller les entr\u00e9es de registre suspectes imitant des logiciels audio l\u00e9gitimes, les tentatives d\u2019activation du Protocole Bureau \u00e0 distance et les comptes Microsoft Teams externes se faisant passer pour le personnel de support interne. Ensemble, ces indicateurs peuvent aider \u00e0 identifier l\u2019ing\u00e9nierie sociale et l\u2019activit\u00e9 post-compromission \u00e0 un stade pr\u00e9coce de la cha\u00eene d\u2019attaque.<\/p>\n\n\n\n

Dans d\u2019autres actualit\u00e9s de s\u00e9curit\u00e9, Microsoft peine \u00e0 corriger les vuln\u00e9rabilit\u00e9s<\/a> identifi\u00e9es par Claude Mythos d\u2019Anthropic. \u00c0 mesure que la recherche en s\u00e9curit\u00e9 devient plus automatis\u00e9e, les attaquants pourraient \u00e9galement trouver et exploiter plus rapidement les faiblesses logicielles.<\/p>\n\n\n\n

Via BleepingComputer<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Des acteurs de menace se font passer pour des techniciens du support informatique d\u2019entreprise sur Microsoft Teams afin d\u2019obtenir un acc\u00e8s \u00e0 distance aux appareils des employ\u00e9s et de d\u00e9ployer le ransomware Chaos. Sophos suit la campagne sous le nom STAC4749. L\u2019entreprise de s\u00e9curit\u00e9 a observ\u00e9 des dizaines de tentatives d\u2019attaques contre des organisations aux […]<\/p>\n","protected":false},"author":49,"featured_media":24891,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_enabled_clarity":"","footnotes":""},"categories":[1019],"tags":[],"work":[],"class_list":["post-24890","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutoriels"],"acf":[],"yoast_head":"\nArnaques au support informatique via Microsoft Teams m\u00e8nent \u00e0 des attaques du ransomware Chaos<\/title>\n<meta name=\"description\" content=\"Des hackers se font passer pour du personnel de support informatique sur Microsoft Teams afin d\u2019obtenir un acc\u00e8s \u00e0 distance et de d\u00e9ployer le ransomware Chaos sur les r\u00e9seaux d\u2019entreprise.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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