{"id":5988,"date":"2026-07-31T08:13:16","date_gmt":"2026-07-31T08:13:16","guid":{"rendered":"https:\/\/windowsreport.com\/pt\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\/"},"modified":"2026-07-31T08:13:16","modified_gmt":"2026-07-31T08:13:16","slug":"golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/pt\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\/","title":{"rendered":"Golpes de suporte de TI no Microsoft Teams levam a ataques de ransomware Chaos"},"content":{"rendered":"\n

Agentes de amea\u00e7a est\u00e3o a fazer-se passar por t\u00e9cnicos de suporte de TI empresariais no Microsoft Teams para obter acesso remoto aos dispositivos dos funcion\u00e1rios e implementar o ransomware Chaos.<\/p>\n\n\n\n

A Sophos monitoriza a campanha como STAC4749<\/a>. A empresa de seguran\u00e7a observou dezenas de tentativas de ataque contra organiza\u00e7\u00f5es nos Estados Unidos e no Canad\u00e1 entre fevereiro e junho de 2026. Pelo menos tr\u00eas incidentes terminaram com a encripta\u00e7\u00e3o por ransomware.<\/p>\n\n\n\n

Atacantes fazem-se passar por equipa de TI no Microsoft Teams<\/h2>\n\n\n\n

Os atacantes contactaram os funcion\u00e1rios atrav\u00e9s de contas externas do Microsoft Teams. Durante conversas por chat e chamadas de voz, apresentavam-se como t\u00e9cnicos de helpdesk ou membros do departamento de TI da empresa.<\/p>\n\n\n\n

Em seguida, alegavam que precisavam de acesso ao computador do funcion\u00e1rio para resolver um problema t\u00e9cnico. O seu objetivo era persuadir o alvo a aprovar uma sess\u00e3o de suporte remoto sem verificar o pedido atrav\u00e9s de um canal interno.<\/p>\n\n\n\n

Assim que um funcion\u00e1rio aceitava o pedido, os atacantes obtinham acesso direto ao dispositivo e come\u00e7avam a instalar ferramentas adicionais.<\/p>\n\n\n\n

RemSupp substitui a Assist\u00eancia R\u00e1pida da Microsoft em ataques posteriores<\/h3>\n\n\n\n

As primeiras vers\u00f5es da campanha dependiam fortemente da Assist\u00eancia R\u00e1pida da Microsoft, uma funcionalidade leg\u00edtima de suporte do Windows que permite a outra pessoa ver ou controlar um computador remotamente.<\/p>\n\n\n\n

Quando a Assist\u00eancia R\u00e1pida estava bloqueada ou indispon\u00edvel, os atacantes instru\u00edam as v\u00edtimas a instalar outro software de gest\u00e3o remota. A partir de abril, passaram a recorrer cada vez mais ao servi\u00e7o baseado na nuvem RemSupp.<\/p>\n\n\n\n

A Sophos acredita que o RemSupp pode ter-se tornado a op\u00e7\u00e3o preferida porque menos listas de bloqueio de aplica\u00e7\u00f5es empresariais o reconheciam. A utiliza\u00e7\u00e3o de software de suporte remoto leg\u00edtimo tamb\u00e9m ajudou os atacantes a evitar a utiliza\u00e7\u00e3o de ferramentas obviamente maliciosas durante a primeira fase do ataque.<\/p>\n\n\n\n

PowerShell descarrega um backdoor persistente<\/h3>\n\n\n\n

Ap\u00f3s obterem acesso remoto, os atacantes utilizaram comandos do PowerShell para descarregar um backdoor para a pasta %AppData% da v\u00edtima.<\/p>\n\n\n\n

O malware recolheu informa\u00e7\u00f5es sobre o sistema comprometido, criou mecanismos de persist\u00eancia e manteve o acesso ap\u00f3s o t\u00e9rmino da sess\u00e3o original do Teams ou do suporte remoto.<\/p>\n\n\n\n

Para fazer a atividade parecer leg\u00edtima, os atacantes criaram entradas de registo com nomes que se assemelhavam a componentes de \u00e1udio do Windows. Os nomes observados inclu\u00edam Realtek HD Audio, Realtek Audio UHD e WinAudio life2.<\/p>\n\n\n\n

Estas entradas permitiam que o malware iniciasse automaticamente, ao mesmo tempo que dificultavam a identifica\u00e7\u00e3o do processo suspeito por parte dos funcion\u00e1rios e administradores.<\/p>\n\n\n\n

Atacantes instalam v\u00e1rias ferramentas de acesso remoto<\/h3>\n\n\n\n

Em incidentes que progrediram para ransomware, o grupo instalou aplica\u00e7\u00f5es de acesso remoto adicionais, incluindo DWAgent e AnyDesk.<\/p>\n\n\n\n

Estas ferramentas forneciam acesso de reserva caso os defensores interrompessem a liga\u00e7\u00e3o original. Os atacantes tamb\u00e9m tentaram ativar o Protocolo de Ambiente de Trabalho Remoto, que os poderia ajudar a aceder a outros sistemas e a moverem-se pela rede empresarial.<\/p>\n\n\n\n

A Sophos observou altera\u00e7\u00f5es repetidas na cadeia de ataque entre fevereiro e maio. Os operadores ajustaram as suas ferramentas, comandos e m\u00e9todos de persist\u00eancia \u00e0 medida que os produtos de seguran\u00e7a come\u00e7aram a detetar as vers\u00f5es anteriores.<\/p>\n\n\n\n

Ransomware Chaos encriptou v\u00e1rios sistemas em simult\u00e2neo<\/h3>\n\n\n\n

Pelo menos tr\u00eas ataques da campanha STAC4749 resultaram na implementa\u00e7\u00e3o do ransomware Chaos. Durante estes incidentes, o ransomware encriptou ficheiros em v\u00e1rios computadores comprometidos aproximadamente ao mesmo tempo.<\/p>\n\n\n\n

As provas de pelo menos um ataque sugerem que o grupo pode ter roubado dados empresariais antes de iniciar a encripta\u00e7\u00e3o. Isto permitiria aos atacantes pressionar a v\u00edtima tanto com a exposi\u00e7\u00e3o de dados como com a perturba\u00e7\u00e3o do sistema.<\/p>\n\n\n\n

A Sophos avalia a campanha como sendo motivada financeiramente. Os operadores podem implementar o ransomware eles pr\u00f3prios ou fornecer acesso a afiliados de ransomware separados depois de comprometerem uma rede.<\/p>\n\n\n\n

Outros grupos de amea\u00e7a tamb\u00e9m utilizaram o Microsoft Teams para engenharia social. O grupo MuddyWater, apoiado pelo estado iraniano, utilizou o Teams e atividade falsa de ransomware para ocultar opera\u00e7\u00f5es de espionagem.<\/p>\n\n\n\n

As campanhas relacionadas com o Chaos tamb\u00e9m utilizaram outras t\u00e9cnicas. Numa opera\u00e7\u00e3o separada, o ransomware Chaos utilizou o msaRAT para disfar\u00e7ar o tr\u00e1fego malicioso dentro do Chrome e do Edge.<\/p>\n\n\n\n

Como as organiza\u00e7\u00f5es podem bloquear ataques de vishing no Teams<\/h3>\n\n\n\n

As empresas devem limitar as comunica\u00e7\u00f5es externas do Microsoft Teams ou monitorizar atentamente as mensagens e chamadas de contas fora da organiza\u00e7\u00e3o.<\/p>\n\n\n\n

Os funcion\u00e1rios nunca devem aprovar um pedido inesperado de suporte remoto sem o confirmar atrav\u00e9s de um m\u00e9todo de contacto interno oficial. Os departamentos de TI tamb\u00e9m devem explicar claramente quais as ferramentas que os seus t\u00e9cnicos utilizam e como s\u00e3o iniciados os pedidos de suporte leg\u00edtimos.<\/p>\n\n\n\n

As equipas de seguran\u00e7a devem bloquear ou restringir a Assist\u00eancia R\u00e1pida, o RemSupp, o AnyDesk, o DWAgent e software semelhante em sistemas que n\u00e3o necessitem de administra\u00e7\u00e3o remota.<\/p>\n\n\n\n

As organiza\u00e7\u00f5es devem monitorizar a atividade invulgar do PowerShell, incluindo downloads inesperados ou comandos codificados, bem como a instala\u00e7\u00e3o de novas aplica\u00e7\u00f5es de gest\u00e3o remota ou n\u00e3o autorizadas. Estes comportamentos podem indicar que um atacante obteve acesso inicial e est\u00e1 a tentar estabelecer o controlo sobre um sistema.<\/p>\n\n\n\n

Devem tamb\u00e9m estar atentos a entradas de registo suspeitas que imitam software de \u00e1udio leg\u00edtimo, tentativas de ativar o Protocolo de Ambiente de Trabalho Remoto e contas externas do Microsoft Teams que se fazem passar por equipa de suporte interna. Em conjunto, estes indicadores podem ajudar a identificar a engenharia social e a atividade p\u00f3s-compromisso numa fase inicial da cadeia de ataque.<\/p>\n\n\n\n

Em outras not\u00edcias de seguran\u00e7a, a Microsoft est\u00e1 a ter dificuldades em resolver vulnerabilidades<\/a> identificadas pelo Claude Mythos da Anthropic. \u00c0 medida que a investiga\u00e7\u00e3o de seguran\u00e7a se torna mais automatizada, os atacantes tamb\u00e9m podem encontrar e explorar as fraquezas do software mais rapidamente.<\/p>\n\n\n\n

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

Agentes de amea\u00e7a est\u00e3o a fazer-se passar por t\u00e9cnicos de suporte de TI empresariais no Microsoft Teams para obter acesso remoto aos dispositivos dos funcion\u00e1rios e implementar o ransomware Chaos. A Sophos monitoriza a campanha como STAC4749. A empresa de seguran\u00e7a observou dezenas de tentativas de ataque contra organiza\u00e7\u00f5es nos Estados Unidos e no Canad\u00e1 […]<\/p>\n","protected":false},"author":49,"featured_media":5989,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_enabled_clarity":"","footnotes":""},"categories":[55],"tags":[],"work":[],"class_list":["post-5988","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutoriais"],"acf":[],"yoast_head":"\nGolpes de suporte de TI no Microsoft Teams levam a ataques de ransomware Chaos - WindowsReport PT (Portuguese)<\/title>\n<meta name=\"description\" content=\"Hackers est\u00e3o a fazer-se passar por pessoal de suporte de TI no Microsoft Teams para obter acesso remoto e implementar o ransomware Chaos em redes empresariais.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/windowsreport.com\/pt\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Golpes de suporte de TI no Microsoft Teams levam a ataques de ransomware Chaos\" \/>\n<meta property=\"og:description\" content=\"Hackers est\u00e3o a fazer-se passar por pessoal de suporte de TI no Microsoft Teams para obter acesso remoto e implementar o ransomware Chaos em redes empresariais.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/windowsreport.com\/pt\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\/\" \/>\n<meta property=\"og:site_name\" content=\"WindowsReport PT (Portuguese)\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-31T08:13:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/windowsreport.com\/pt\/wp-content\/uploads\/sites\/2\/2026\/07\/teams-chaos-ransomware.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"801\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Milan Stanojevic\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@MilanStanojev17\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Milan Stanojevic\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\\\/\"},\"author\":{\"name\":\"Milan Stanojevic\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/#\\\/schema\\\/person\\\/e3910b02e4592db47a0eb303765a3a25\"},\"headline\":\"Golpes de suporte de TI no Microsoft Teams levam a ataques de ransomware Chaos\",\"datePublished\":\"2026-07-31T08:13:16+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\\\/\"},\"wordCount\":1056,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/teams-chaos-ransomware.jpg\",\"articleSection\":[\"Tutoriais\"],\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/windowsreport.com\\\/pt\\\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\\\/#respond\"]}],\"copyrightYear\":\"2026\",\"copyrightHolder\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\\\/\",\"url\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/golpes-de-suporte-de-ti-no-microsoft-teams-levam-a-ataques-de-ransomware-chaos\\\/\",\"name\":\"Golpes de suporte de TI no Microsoft Teams levam a ataques de ransomware Chaos - 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