{"id":6171,"date":"2026-08-04T13:06:14","date_gmt":"2026-08-04T13:06:14","guid":{"rendered":"https:\/\/windowsreport.com\/pt\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\/"},"modified":"2026-08-04T13:06:14","modified_gmt":"2026-08-04T13:06:14","slug":"malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/pt\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\/","title":{"rendered":"Malware pode roubar Google Passkeys usando ataques Pass-ta-key"},"content":{"rendered":"\n

Os ataques Pass-ta-key podem permitir que malware abuse do Google Password Manager e sequestre passkeys armazenadas atrav\u00e9s do Chrome no Windows. Os ataques n\u00e3o quebram a encripta\u00e7\u00e3o da passkey, mas exploram fraquezas no registo de dispositivos, recupera\u00e7\u00e3o, sincroniza\u00e7\u00e3o e verifica\u00e7\u00f5es de confian\u00e7a.<\/p>\n\n\n\n

A Unit 42 da Palo Alto Networks descobriu tr\u00eas ataques<\/a> que afetam as passkeys sincronizadas atrav\u00e9s do Google Password Manager. Os investigadores nomearam coletivamente as t\u00e9cnicas como Pass-ta-key.<\/p>\n\n\n\n

Todos os tr\u00eas ataques exigem que o malware j\u00e1 esteja a ser executado no computador Windows da v\u00edtima. No entanto, algumas t\u00e9cnicas funcionam sem permiss\u00f5es de administrador ou intera\u00e7\u00e3o adicional do utilizador.<\/p>\n\n\n\n

Malware pode personificar um dispositivo Windows confi\u00e1vel<\/h2>\n\n\n\n

A primeira t\u00e9cnica Pass-ta-key permite que o malware se fa\u00e7a passar por um dispositivo Windows que o Google j\u00e1 considera confi\u00e1vel.<\/p>\n\n\n\n

O malware abusa da chave de identidade do dispositivo do Chrome suportada por TPM para solicitar uma resposta de autentica\u00e7\u00e3o v\u00e1lida do autenticador na cloud do Google. O processo pode ocorrer sem dados biom\u00e9tricos, PIN, aprova\u00e7\u00e3o do utilizador ou at\u00e9 mesmo sem desbloquear o computador.<\/p>\n\n\n\n

O Google pode ent\u00e3o devolver uma asser\u00e7\u00e3o de passkey assinada que o atacante pode usar para aceder \u00e0 conta alvo.<\/p>\n\n\n\n

As asser\u00e7\u00f5es de passkey cont\u00eam um sinalizador de verifica\u00e7\u00e3o do utilizador que indica se o utilizador aprovou o in\u00edcio de sess\u00e3o atrav\u00e9s de um PIN ou verifica\u00e7\u00e3o biom\u00e9trica. Os sites podem bloquear este ataque quando exigem a verifica\u00e7\u00e3o do utilizador e validam corretamente esse sinalizador.<\/p>\n\n\n\n

Silver Pass-ta-key adiciona uma chave controlada pelo atacante<\/h3>\n\n\n\n

A segunda t\u00e9cnica, chamada Silver Pass-ta-key, permite que os atacantes registem a sua pr\u00f3pria chave de verifica\u00e7\u00e3o no autenticador na cloud do Google.<\/p>\n\n\n\n

O malware primeiro remove ou invalida o estado existente de passkey do Chrome, for\u00e7ando o navegador a repetir o seu processo de registo do dispositivo. Durante o registo, o atacante submete uma chave de verifica\u00e7\u00e3o que controla.<\/p>\n\n\n\n

De acordo com a Unit 42, o sistema do Google n\u00e3o verificou se a chave de substitui\u00e7\u00e3o provinha de hardware confi\u00e1vel.<\/p>\n\n\n\n

Assim que o Google aceita a chave maliciosa, os atacantes podem us\u00e1-la como prova de que a v\u00edtima aprovou um pedido de autentica\u00e7\u00e3o. Esta t\u00e9cnica pode contornar servi\u00e7os que exigem corretamente a verifica\u00e7\u00e3o por PIN ou biom\u00e9trica.<\/p>\n\n\n\n

O atacante tamb\u00e9m pode autenticar-se mais tarde a partir de outro dispositivo. J\u00e1 n\u00e3o precisa de acesso cont\u00ednuo ao computador original comprometido.<\/p>\n\n\n\n

Golden Pass-ta-key exp\u00f5e o segredo mestre da passkey<\/h3>\n\n\n\n

A t\u00e9cnica mais grave, Golden Pass-ta-key, tem como alvo o segredo do dom\u00ednio de seguran\u00e7a utilizado para encriptar todas as passkeys sincronizadas atrav\u00e9s do Google Password Manager.<\/p>\n\n\n\n

O Google fornece temporariamente este segredo mestre ao Chrome durante o registo do dispositivo ou a recupera\u00e7\u00e3o da conta. A Unit 42 inicialmente encontrou o segredo armazenado em texto simples nos registos FIDO do Chrome.<\/p>\n\n\n\n

O Google removeu o valor desses registos ap\u00f3s os investigadores divulgarem o problema.<\/p>\n\n\n\n

No entanto, a Unit 42 afirma que o segredo ainda aparece temporariamente na mem\u00f3ria do processo do Chrome. O malware pode acionar o novo registo do dispositivo e procurar na mem\u00f3ria do navegador pela chave de encripta\u00e7\u00e3o.<\/p>\n\n\n\n

Ap\u00f3s extrair o segredo, os atacantes podem desencriptar os registos de passkeys sincronizadas e aceder \u00e0s suas chaves privadas. Podem ent\u00e3o transferir essas chaves para outro dispositivo e fazer-se passar pela v\u00edtima.<\/p>\n\n\n\n

O segredo roubado tamb\u00e9m pode desencriptar passkeys adicionadas \u00e0 conta posteriormente. Os investigadores relataram que a implementa\u00e7\u00e3o do Google atualmente n\u00e3o oferece uma forma de rodar ou revogar o segredo do dom\u00ednio de seguran\u00e7a.<\/p>\n\n\n\n

Isto significa que os atacantes podem manter o acesso tanto \u00e0s passkeys sincronizadas existentes como \u00e0s futuras ap\u00f3s roubarem a chave.<\/p>\n\n\n\n

As passkeys ainda dependem da seguran\u00e7a do dispositivo<\/h3>\n\n\n\n

A Unit 42 reportou privadamente as fraquezas do Google Password Manager ao Google antes de publicar a sua investiga\u00e7\u00e3o. O Google n\u00e3o confirmou publicamente se resolveu totalmente todas as t\u00e9cnicas descritas.<\/p>\n\n\n\n

A investiga\u00e7\u00e3o mostra que as passkeys ainda podem tornar-se vulner\u00e1veis quando o malware compromete o dispositivo que as gere. Embora a Microsoft tenha estado a incentivar os utilizadores a adotar passkeys, a autentica\u00e7\u00e3o sem palavra-passe n\u00e3o consegue proteger totalmente as contas quando os atacantes controlam o navegador ou o sistema operativo.<\/p>\n\n\n\n

Os sites devem exigir a verifica\u00e7\u00e3o do utilizador e validar o sinalizador de passkey associado. Os gestores de credenciais tamb\u00e9m devem confirmar que as novas chaves de dispositivo registadas prov\u00eam de hardware confi\u00e1vel.<\/p>\n\n\n\n

Os programadores devem refor\u00e7ar os processos de recupera\u00e7\u00e3o e novo registo do dispositivo, limitando ao mesmo tempo o tempo durante o qual as chaves de encripta\u00e7\u00e3o sens\u00edveis permanecem dispon\u00edveis na mem\u00f3ria do navegador.<\/p>\n\n\n\n

Os utilizadores devem continuar a instalar atualiza\u00e7\u00f5es de seguran\u00e7a, evitar downloads suspeitos e proteger os seus computadores contra malware. O Google tamb\u00e9m introduziu a recupera\u00e7\u00e3o de conta por Selfie Video com prote\u00e7\u00f5es contra deepfakes, como parte dos seus esfor\u00e7os mais amplos de seguran\u00e7a da conta.<\/p>\n\n\n\n

A seguran\u00e7a do dispositivo continua a ser especialmente importante ao utilizar redes p\u00fablicas. A Microsoft descobriu recentemente uma campanha global de malware em Wi-Fi de hot\u00e9is<\/a> que visava viajantes atrav\u00e9s de portais cativos comprometidos.<\/p>\n\n\n\n

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

Os ataques Pass-ta-key podem permitir que malware abuse do Google Password Manager e sequestre passkeys armazenadas atrav\u00e9s do Chrome no Windows. Os ataques n\u00e3o quebram a encripta\u00e7\u00e3o da passkey, mas exploram fraquezas no registo de dispositivos, recupera\u00e7\u00e3o, sincroniza\u00e7\u00e3o e verifica\u00e7\u00f5es de confian\u00e7a. A Unit 42 da Palo Alto Networks descobriu tr\u00eas ataques que afetam as […]<\/p>\n","protected":false},"author":49,"featured_media":6172,"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-6171","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutoriais"],"acf":[],"yoast_head":"\nMalware pode roubar Google Passkeys usando ataques Pass-ta-key - WindowsReport PT (Portuguese)<\/title>\n<meta name=\"description\" content=\"Ataques Pass-ta-key permitem que malware sequestre chaves de acesso sincronizadas pelo Google ao abusar dos sistemas de confian\u00e7a de dispositivo, recupera\u00e7\u00e3o e sincroniza\u00e7\u00e3o do Chrome.\" \/>\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\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Malware pode roubar Google Passkeys usando ataques Pass-ta-key\" \/>\n<meta property=\"og:description\" content=\"Ataques Pass-ta-key permitem que malware sequestre chaves de acesso sincronizadas pelo Google ao abusar dos sistemas de confian\u00e7a de dispositivo, recupera\u00e7\u00e3o e sincroniza\u00e7\u00e3o do Chrome.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/windowsreport.com\/pt\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\/\" \/>\n<meta property=\"og:site_name\" content=\"WindowsReport PT (Portuguese)\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-04T13:06:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/windowsreport.com\/pt\/wp-content\/uploads\/sites\/2\/2026\/08\/google-passkey-malware-1.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\\\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\\\/\"},\"author\":{\"name\":\"Milan Stanojevic\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/#\\\/schema\\\/person\\\/e3910b02e4592db47a0eb303765a3a25\"},\"headline\":\"Malware pode roubar Google Passkeys usando ataques Pass-ta-key\",\"datePublished\":\"2026-08-04T13:06:14+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\\\/\"},\"wordCount\":933,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/08\\\/google-passkey-malware-1.jpg\",\"articleSection\":[\"Tutoriais\"],\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/windowsreport.com\\\/pt\\\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\\\/#respond\"]}],\"copyrightYear\":\"2026\",\"copyrightHolder\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\\\/\",\"url\":\"https:\\\/\\\/windowsreport.com\\\/pt\\\/malware-pode-roubar-google-passkeys-usando-ataques-pass-ta-key\\\/\",\"name\":\"Malware pode roubar Google Passkeys usando ataques Pass-ta-key - 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