{"id":21851,"date":"2025-03-26T20:28:21","date_gmt":"2025-03-26T18:28:21","guid":{"rendered":"https:\/\/masterbase.com\/es\/es\/es\/?p=21851"},"modified":"2025-03-26T20:31:01","modified_gmt":"2025-03-26T18:31:01","slug":"email-ciberseguranca-como-evitar-ataques-de-phishing-malware-e-fraude-com-autenticacao-avancada","status":"publish","type":"post","link":"https:\/\/masterbase.com\/pt\/ciberseguridad-en-correos-electronicos-como-evitar-ataques-de-phishing-malware-y-fraudes-con-autenticacion-avanzada\/masterbase\/","title":{"rendered":"Ciberseguran\u00e7a do correio eletr\u00f3nico: como evitar ataques de phishing, malware e fraude com autentica\u00e7\u00e3o avan\u00e7ada"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Mais de 90% dos ciberataques come\u00e7am com uma mensagem de correio eletr\u00f3nico malicioso, seja atrav\u00e9s de phishing, malware ou fraude direcionada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No entanto, existe uma forma de refor\u00e7ar a seguran\u00e7a do correio eletr\u00f3nico e minimizar estes riscos: <strong>autentica\u00e7\u00e3o avan\u00e7ada<\/strong>. Protocolos como <strong>SPF, DKIM e DMARC<\/strong> Protegem as empresas contra a fraude e o phishing e tamb\u00e9m melhoram a capacidade de entrega de mensagens de correio eletr\u00f3nico leg\u00edtimas, garantindo que estas chegam \u00e0 caixa de entrada e n\u00e3o \u00e0 pasta de spam.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Neste artigo, vamos explorar <strong>as principais amea\u00e7as no correio eletr\u00f3nico, o papel fundamental da autentica\u00e7\u00e3o e como o MasterBase\u00ae funciona para garantir a seguran\u00e7a e a efic\u00e1cia dos envios comerciais<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Amea\u00e7as por correio eletr\u00f3nico mais comuns<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udce9<\/strong><strong> 1. phishing: a burla mais comum<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O phishing \u00e9 um m\u00e9todo de ataque em que os cibercriminosos se fazem passar por empresas ou indiv\u00edduos de confian\u00e7a para enganar os utilizadores e roubar credenciais ou dados sens\u00edveis.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd39 <strong>Exemplo:<\/strong> Uma mensagem de correio eletr\u00f3nico que parece vir de um banco e que lhe pede para atualizar os seus dados de acesso atrav\u00e9s de uma liga\u00e7\u00e3o fraudulenta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83c\udfaf<\/strong><strong> 2) Spear Phishing: ataques direcionados<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ao contr\u00e1rio do phishing em massa, o spear phishing visa indiv\u00edduos espec\u00edficos e utiliza informa\u00e7\u00f5es personalizadas para tornar o logro mais convincente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd39 <strong>Exemplo:<\/strong> Um funcion\u00e1rio recebe uma mensagem de correio eletr\u00f3nico falsa na qual o diretor executivo pede alegadamente transfer\u00eancias urgentes ou acesso a informa\u00e7\u00f5es confidenciais.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udcbc<\/strong><strong> 3. Comprometimento do correio eletr\u00f3nico comercial (BEC): Fraude empresarial<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Os atacantes comprometem uma conta de correio eletr\u00f3nico comercial leg\u00edtima e utilizam-na para enviar instru\u00e7\u00f5es fraudulentas a empregados ou fornecedores.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd39 <strong>Exemplo:<\/strong> Um cibercriminoso faz-se passar pelo departamento financeiro e envia uma mensagem de correio eletr\u00f3nico a pedir um pagamento para uma conta fraudulenta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83e\udda0<\/strong><strong> 4. Malware e ransomware em anexos<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Muitos ataques come\u00e7am com um anexo aparentemente inofensivo que, quando aberto, instala malware ou ransomware no sistema da v\u00edtima.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd39 <strong>Exemplo:<\/strong> Um funcion\u00e1rio recebe um ficheiro Word com macros maliciosas que instalam ransomware na rede da empresa.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>O papel fundamental do SPF, DKIM e DMARC na seguran\u00e7a do correio eletr\u00f3nico<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Para atenuar estes riscos, \u00e9 essencial <strong>autenticar mensagens de correio eletr\u00f3nico e impedir que terceiros falsifiquem dom\u00ednios empresariais<\/strong>. \u00c9 aqui que entram em a\u00e7\u00e3o tr\u00eas protocolos fundamentais:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udd39<\/strong><strong> SPF (Sender Policy Framework): O primeiro filtro de confian\u00e7a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O SPF impede que os cibercriminosos enviem mensagens de correio eletr\u00f3nico a partir de um dom\u00ednio falso, verificando quais os servidores autorizados a enviar mensagens de correio eletr\u00f3nico em nome de uma empresa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd39 <strong>Exemplo:<\/strong> Se receber uma mensagem de correio eletr\u00f3nico do dom\u00ednio do seu banco, o SPF verifica se esta foi efetivamente enviada de um servidor autorizado.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udd39<\/strong><strong> DKIM (DomainKeys Identified Mail): A assinatura digital para correio eletr\u00f3nico<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O DKIM acrescenta uma camada de seguran\u00e7a ao anexar uma assinatura digital \u00fanica a cada correio eletr\u00f3nico enviado, garantindo que a mensagem n\u00e3o foi alterada em tr\u00e2nsito.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd39 <strong>Exemplo:<\/strong> Se um pirata inform\u00e1tico tentar modificar uma mensagem de correio eletr\u00f3nico a caminho da sua caixa de entrada, o DKIM detectar\u00e1 e bloquear\u00e1 essa modifica\u00e7\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udd39<\/strong><strong> DMARC (Domain-based Message Authentication, Reporting &amp; Conformance): A \u00faltima linha de defesa<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O DMARC baseia-se no SPF e no DKIM para decidir como tratar os e-mails suspeitos e evitar ataques de phishing e spoofing. Tamb\u00e9m fornece relat\u00f3rios sobre tentativas de phishing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd39 <strong>Exemplo:<\/strong> Se um atacante tentar enviar mensagens de correio eletr\u00f3nico falsas a partir de um dom\u00ednio empresarial, o DMARC pode rejeitar essas mensagens ou marc\u00e1-las como spam.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Exemplo de falsifica\u00e7\u00e3o de endere\u00e7o de correio eletr\u00f3nico<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><strong>Sem as protec\u00e7\u00f5es adequadas, como SPF, DKIM e DMARC, \u00e9 extremamente f\u00e1cil falsificar uma mensagem de correio eletr\u00f3nico e fingir que prov\u00e9m de uma empresa leg\u00edtima e fi\u00e1vel.<\/strong><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Um caso documentado demonstra o seguinte:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Foi identificada uma conhecida empresa do sector aeroespacial (Dassault-Aviation) que n\u00e3o tinha o protocolo DMARC configurado.<\/li>\n\n\n\n<li>Foi poss\u00edvel descobrir publicamente quem era o diretor-geral e qual o formato habitual dos endere\u00e7os de correio eletr\u00f3nico das empresas.<\/li>\n\n\n\n<li>Com esta informa\u00e7\u00e3o, foi gerado um e-mail falso a partir de um endere\u00e7o que imitava o de um membro da Comiss\u00e3o Executiva. A mensagem foi enviada e recebida com \u00eaxito, sem ser bloqueada ou assinalada como suspeita.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O SPF, o DKIM e o DMARC podem impedir completamente o phishing? N\u00e3o completamente.<\/strong><br>\u00c9 ainda poss\u00edvel enganar os utilizadores utilizando endere\u00e7os visualmente semelhantes (por exemplo, customer-amazon.com, Linkedln.com com um \"L\" min\u00fasculo em vez de um \"i\", ou service-dashlane.com). Estas varia\u00e7\u00f5es s\u00e3o dif\u00edceis de detetar a olho nu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No entanto, <strong>SPF, DKIM e DMARC impedem, de facto, que os atacantes enviem correio eletr\u00f3nico utilizando o dom\u00ednio real de uma empresa sem autoriza\u00e7\u00e3o.<\/strong>Isto evita a imita\u00e7\u00e3o direta e protege a reputa\u00e7\u00e3o da marca.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Estas tecnologias s\u00e3o fundamentais para criar um ambiente digital mais seguro. Sem elas, os atacantes podem facilmente explorar a confian\u00e7a numa marca para enganar funcion\u00e1rios, clientes ou parceiros.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>MasterBase\u00ae e seguran\u00e7a do correio eletr\u00f3nico<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Em <strong>MasterBase<\/strong>Compreendemos que a autentica\u00e7\u00e3o de correio eletr\u00f3nico \u00e9 essencial para proteger os nossos clientes contra ataques e melhorar a capacidade de entrega das suas campanhas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 <strong>Exigimos que todos os nossos clientes configurem corretamente o SPF, o DKIM e o DMARC.<\/strong> antes de enviar, garantindo que as suas mensagens de correio eletr\u00f3nico s\u00e3o leg\u00edtimas e chegam \u00e0 caixa de entrada.<br>\u2714 <strong>Prestamos apoio e orienta\u00e7\u00e3o pormenorizados<\/strong> para ajudar os nossos clientes a configurar estes protocolos de uma forma simples.<br>\u2714 <strong>Monitorizamos continuamente as tentativas de phishing.<\/strong> para refor\u00e7ar a seguran\u00e7a e evitar a fraude.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Se for um cliente MasterBase\u00ae, contacte o seu <strong>Gerente de sucesso do cliente<\/strong> para garantir que o seu dom\u00ednio est\u00e1 corretamente autenticado e protegido.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Melhores pr\u00e1ticas para proteger a sua caixa de entrada<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Para al\u00e9m da autentica\u00e7\u00e3o, existem medidas adicionais que pode tomar para evitar ser v\u00edtima de ataques por correio eletr\u00f3nico:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd39 <strong>N\u00e3o abrir mensagens de correio eletr\u00f3nico de remetentes desconhecidos.<\/strong><br>\ud83d\udd39 <strong>Verificar sempre as liga\u00e7\u00f5es antes de clicar.<\/strong><br>\ud83d\udd39 <strong>Ativar a autentica\u00e7\u00e3o multi-fator (MFA) em todas as suas contas.<\/strong><br>\ud83d\udd39 <strong>D\u00ea forma\u00e7\u00e3o aos seus empregados sobre dete\u00e7\u00e3o de phishing.<\/strong><br>\ud83d\udd39 <strong>Utilizar solu\u00e7\u00f5es de seguran\u00e7a avan\u00e7adas para filtrar mensagens de correio eletr\u00f3nico maliciosas.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Conclus\u00e3o<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O correio eletr\u00f3nico continua a ser um dos principais vectores de ataque na ciberseguran\u00e7a, mas <strong>com autentica\u00e7\u00e3o avan\u00e7ada e boas pr\u00e1ticas de seguran\u00e7a<\/strong>os riscos podem ser minimizados.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SPF, DKIM e DMARC n\u00e3o s\u00f3 protegem contra a fraude e o roubo de identidade, como tamb\u00e9m <strong>melhorar a reputa\u00e7\u00e3o e a capacidade de entrega das expedi\u00e7\u00f5es leg\u00edtimas<\/strong>. Em <strong>MasterBase\u00ae, garantimos que todas as mensagens de correio eletr\u00f3nico enviadas cumprem estas normas<\/strong>Garantimos a seguran\u00e7a e a efic\u00e1cia das campanhas dos nossos clientes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e3o deixe que os cibercriminosos assumam o controlo da sua caixa de correio eletr\u00f3nico. <strong>Proteja o seu correio eletr\u00f3nico com autentica\u00e7\u00e3o avan\u00e7ada e reforce a seguran\u00e7a da sua empresa.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"https:\/\/masterbase.com\/pt\/es\/es\/laboratorios-lp-mba\/\"><img data-recalc-dims=\"1\" fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"220\" data-attachment-id=\"20466\" data-permalink=\"https:\/\/masterbase.com\/pt\/mb\/labs\/\" data-orig-file=\"https:\/\/i0.wp.com\/masterbase.com\/wp-content\/uploads\/2025\/01\/labs.png?fit=1280%2C351&amp;ssl=1\" data-orig-size=\"1280,351\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"MB Labs\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/masterbase.com\/wp-content\/uploads\/2025\/01\/labs.png?fit=800%2C220&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/masterbase.com\/es\/es\/es\/wp-content\/uploads\/2025\/01\/labs-1024x281.png?resize=800%2C220&#038;ssl=1\" alt=\"Laborat\u00f3rios MB\" class=\"wp-image-20466\" srcset=\"https:\/\/i0.wp.com\/masterbase.com\/wp-content\/uploads\/2025\/01\/labs.png?resize=1024%2C281&amp;ssl=1 1024w, https:\/\/i0.wp.com\/masterbase.com\/wp-content\/uploads\/2025\/01\/labs.png?resize=300%2C82&amp;ssl=1 300w, https:\/\/i0.wp.com\/masterbase.com\/wp-content\/uploads\/2025\/01\/labs.png?resize=768%2C211&amp;ssl=1 768w, https:\/\/i0.wp.com\/masterbase.com\/wp-content\/uploads\/2025\/01\/labs.png?resize=18%2C5&amp;ssl=1 18w, https:\/\/i0.wp.com\/masterbase.com\/wp-content\/uploads\/2025\/01\/labs.png?w=1280&amp;ssl=1 1280w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>O correio eletr\u00f3nico continua a ser um dos principais canais de comunica\u00e7\u00e3o nas empresas, pelo que \u00e9 de vital import\u00e2ncia garantir a sua seguran\u00e7a. <\/p>","protected":false},"author":239642484,"featured_media":21869,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[1391],"tags":[],"class_list":["post-21851","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciberseguridad"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ciberseguridad en correos electr\u00f3nicos: C\u00f3mo evitar ataques de phishing, malware y fraudes, con autenticaci\u00f3n avanzada - MasterBase\u00ae<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/masterbase.com\/pt\/email-ciberseguranca-como-evitar-ataques-de-phishing-malware-e-fraude-com-autenticacao-avancada\/base-principal\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ciberseguridad en correos electr\u00f3nicos: C\u00f3mo evitar ataques de phishing, malware y fraudes, con autenticaci\u00f3n avanzada - MasterBase\u00ae\" \/>\n<meta property=\"og:description\" content=\"El correo electr\u00f3nico sigue siendo uno de los principales canales de comunicaci\u00f3n en las empresas, raz\u00f3n por la 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