{"id":11445,"date":"2024-07-26T22:06:58","date_gmt":"2024-07-26T16:36:58","guid":{"rendered":"https:\/\/threatcop.com\/blog\/?p=11445"},"modified":"2026-05-21T12:40:08","modified_gmt":"2026-05-21T07:10:08","slug":"subdomain-phishing-attacks","status":"publish","type":"post","link":"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/","title":{"rendered":"What Is Subdomain Phishing? Definition, Examples, and Prevention"},"content":{"rendered":"\n<!-- Key Takeaways Section | Threatcop Brand Style -->\n\n<style>\n.threatcop-summary {\n    border: 1px solid #2f80ed;\n    background-color: #f2f7ff;\n    padding: 20px 24px;\n    border-radius: 6px;\n    margin: 30px 0;\n}\n.threatcop-summary h3 {\n    margin-top: 0;\n    color: #2f80ed;\n    font-size: 20px;\n}\n.threatcop-summary ul {\n    padding-left: 20px;\n    margin: 10px 0 0;\n}\n.threatcop-summary li {\n    margin-bottom: 8px;\n    line-height: 1.5;\n}\n<\/style>\n\n<div class=\"threatcop-summary\">\n    <h3><span class=\"ez-toc-section\" id=\"Key_Takeaways\"><\/span>Key Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h3>\n    <ul>\n        <li>Social engineering attacks succeed by exploiting trust, urgency, fear, and human error.<\/li>\n        <li>Multi-factor authentication and email verification reduce the impact of credential theft attacks.<\/li>\n        <li>Regular phishing simulations help employees recognize real-world attack patterns.<\/li>\n        <li>Role-based security awareness training improves long-term behavioural change.<\/li>\n        <li>Fast reporting and incident response reduce damage when social engineering attempts succeed.<\/li>\n    <\/ul>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Subdomain phishing is a cyberattack where criminals hijack forgotten or misconfigured subdomains of legitimate brands. They use these subdomains to send phishing emails that bypass spam filters and look completely real to victims.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #414141;color:#414141\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #414141;color:#414141\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#Key_Takeaways\" >Key Takeaways<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#What_is_Subdomain_Phishing\" >What is Subdomain Phishing?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#Why_Subdomain_Phishing_Is_More_Dangerous_Than_Standard_Phishing\" >Why Subdomain Phishing Is More Dangerous Than Standard Phishing?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#How_Does_Subdomain_Hijacking_Work\" >How Does Subdomain Hijacking Work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#What_Are_the_Signs_of_a_Subdomain_Attack\" >What Are the Signs of a Subdomain Attack?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#How_to_Prevent_Subdomain_Phishing\" >How to Prevent Subdomain Phishing<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#Here_are_some_other_generic_guidelines_to_prevent_subdomain_phishing\" >Here are some other generic guidelines to prevent subdomain phishing:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#Focusing_on_Solution_%E2%80%93_Conclusion\" >Focusing on Solution &#8211; Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#FAQs\" >FAQs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#What_is_subdomain_phishing\" >What is subdomain phishing?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#What_is_the_difference_between_subdomain_phishing_and_subdomain_hijacking\" >What is the difference between subdomain phishing and subdomain hijacking?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#How_do_subdomain_phishing_emails_bypass_spam_filters\" >How do subdomain phishing emails bypass spam filters?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#How_do_I_check_if_my_subdomains_have_been_hijacked\" >How do I check if my subdomains have been hijacked?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/threatcop.com\/blog\/subdomain-phishing-attacks\/#Can_DMARC_prevent_subdomain_phishing\" >Can DMARC prevent subdomain phishing?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n\n<p class=\"wp-block-paragraph\">In February 2024, Guardio Labs exposed a large-scale subdomain attack campaign called &#8220;SubdoMailing.&#8221; Criminals had taken over more than 8,000 domains from trusted brands and sent over 5 million phishing emails. The scary part: those emails passed every standard email security check.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">Read the blog that cuts through the noise and guides you as a CISO on how to not only stay safe from such emails but also protect your company&#8217;s domain address.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_Subdomain_Phishing\"><\/span><span style=\"color: #000000;\"><b>What is Subdomain Phishing?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">Subdomain<\/span> phishing is a type of email-based attack that abuses legitimate subdomains, such as <strong>sale.brand.com<\/strong> or <strong>shop.brand.com<\/strong>, to send fraudulent messages. Because the domain belongs to a real, trusted company, spam filters treat the emails as safe. Victims see a familiar brand name in the sender address and rarely question it.<br><br>This differs from standard phishing, where attackers register lookalike domains. In a subdomain attack, the criminal does not need a fake domain. They use the real one.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1802\" height=\"1040\" src=\"https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2024\/07\/subdomain-explained.webp\" alt=\"\" class=\"wp-image-11447\" style=\"width:483px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Subdomain_Phishing_Is_More_Dangerous_Than_Standard_Phishing\"><\/span><span style=\"color: #000000;\"><b>Why Subdomain Phishing Is More Dangerous Than Standard Phishing<\/b><\/span>?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Standard phishing has visible red flags. Users notice odd domain names like paypa1.com or amazon-secure.net. Subdomain phishing removes those red flags entirely.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is why subdomain attacks are harder to catch:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Passes email security checks.<\/strong> The subdomain shares the parent domain&#8217;s DNS records. SPF and DKIM checks pass because the infrastructure is legitimate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Looks real to the human eye.<\/strong> A URL like offers.mcafee.com or news.msn.com does not trigger suspicion. Users recognize the brand name before the subdomain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Evades spam filters.<\/strong> Most spam filters score emails based on domain reputation. A hijacked subdomain of a Fortune 500 company is considered trusted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Hard to trace.<\/strong> Attackers use the subdomain as a relay, not a destination. The actual phishing page lives on a separate server, making attribution difficult.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Brands such as MSN, CBS, and McAfee have had their subdomains compromised in these campaigns.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"828\" height=\"1163\" src=\"https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2024\/07\/subdomain-phishing-sample.webp\" alt=\"\" class=\"wp-image-11446\" style=\"width:476px;height:auto\"\/><figcaption class=\"wp-element-caption\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\">Source: Reddit User<\/mark><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><b><i>Organizations must acknowledge the evolving landscape of cyber threats, given the alarming trend of hijacked subdomains from major brands being exploited in extensive spam campaigns.\u00a0<\/i><\/b><\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"color: #000000;\"><i><span style=\"font-weight: 400;\">Rahul Powar, CEO of Red Sift<\/span><\/i><\/span><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">To understand how subdomaining<\/span> works, it&#8217;s critical to know the backend process of the whole picture. Popular brands create sub-domains that appear before their brand name. For example, sale.myntra.com. Now, these subdomains are primarily used<span style=\"font-weight: 400; color: #000000;\"> for web linking and redirects.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">Naturally, brands often discontinue using these subdomains over time. Cybercriminals target these hidden subdomains, buy them, and use them under the same brand&#8217;s name to make their emails look more legitimate. Unfortunately, the spam filter considers these links legitimate from the brand and thus delivers the mail straight to your inbox.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_Subdomain_Hijacking_Work\"><\/span>How Does Subdomain Hijacking Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Subdomain hijacking follows a clear process. Here is how a typical subdomain attack unfolds:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Step 1: Target identification.<\/strong> Attackers scan for subdomains that large brands have abandoned. These are often old campaign pages, regional sites, or third-party tool integrations.<\/li>\n\n\n\n<li><strong>Step 2: DNS record exploitation.<\/strong> When a brand stops using a subdomain, the DNS record may still point to an external service. The attacker registers that service, claims the dangling DNS record, and gains control of the subdomain.<\/li>\n\n\n\n<li><strong>Step 3: SPF and DMARC bypass.<\/strong> The hijacked subdomain inherits the parent domain&#8217;s email reputation. If the brand&#8217;s DMARC policy is not enforced at the subdomain level, the attacker can send emails that pass SPF, DKIM, and DMARC checks.<\/li>\n\n\n\n<li><strong>Step 4: Phishing campaign launch.<\/strong> The attacker sends thousands of phishing emails from the hijacked subdomain. Emails carry spoofed login pages, malware links, or social engineering lures, all under the guise of a trusted brand name.<\/li>\n\n\n\n<li><strong>Step 5: Long-term exploitation.<\/strong> Subdomain hijacking often goes unnoticed for months. Attackers hold the subdomain and keep sending emails until someone reports the activity.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_the_Signs_of_a_Subdomain_Attack\"><\/span><span style=\"color: #000000;\"><b>What Are the Signs of a Subdomain Attack?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Your organization may already be under a subdomain attack without knowing it. Watch for these signals:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Customers report phishing emails that appear to come from your domain<\/li>\n\n\n\n<li>Unexpected DMARC failure reports from subdomains you do not actively use<\/li>\n\n\n\n<li>DNS records pointing to unclaimed or expired third-party services<\/li>\n\n\n\n<li>Sudden drops in domain reputation or email deliverability<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\"><strong>Read more:<\/strong> <\/span><a style=\"color: #000000;\" href=\"https:\/\/threatcop.com\/blog\/types-of-social-engineering-attacks\/\"><span style=\"font-weight: 400;\"><span style=\"color: #183994;\">A Brief Guide to Types of Social Engineering Attacks<\/span><\/span><\/a><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">In addition to affecting users, subdomain attacks significantly harm organizations by negatively affecting their brand image.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Prevent_Subdomain_Phishing\"><\/span><span style=\"color: #000000;\"><b>How to Prevent Subdomain Phishing<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">To protect your company&#8217;s name from phishing emails, you need to take critical steps. Tech giants have emphasized strict adherence to <\/span><a style=\"color: #000000;\" href=\"https:\/\/threatcop.com\/blog\/what-is-dmarc\/\"><span style=\"font-weight: 400;\"><strong><span style=\"color: #183994;\">DMARC<\/span><\/strong><\/span><\/a><span style=\"font-weight: 400;\"> and other such protocols.<\/span><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">DMARC provides systematic insight into all emails sent from the organization&#8217;s domain, helping prevent misuse. It helps ensure the security of outbound email traffic, promoting the domain&#8217;s prestige and email deliverability.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">The concern still raises the question of how to implement DMARC. Well, that&#8217;s when <\/span><span style=\"color: #183994;\"><strong><a style=\"color: #183994;\" href=\"https:\/\/threatcop.com\/tdmarc\">TDMARC<\/a><\/strong><\/span><span style=\"font-weight: 400;\"> comes into the picture. It&#8217;s a SaaS-based email authentication tool developed precisely to help businesses deploy and configure DMARC.<\/span><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Here_are_some_other_generic_guidelines_to_prevent_subdomain_phishing\"><\/span><strong><span style=\"color: #000000;\">Here are some other generic guidelines to prevent subdomain phishing:<\/span><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400; color: #000000;\">Perform regular subdomain audits to monitor the status of organizations&#8217; subdomains.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400; color: #000000;\">Unused subdomains are a primary target for cybercriminals. Make sure to delete or repurpose the unused subdomains for an extended period.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400; color: #000000;\">Create and strictly enforce policies for creating and managing brand subdomains, and specify who will be responsible for them.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400; color: #000000;\">Ensure that experienced subdomains are renewed before their expiration to safeguard the domain and prevent attackers from misusing them.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400; color: #000000;\">Lastly, the relevant employees should be trained and well aware of subdomain phishing and the importance of maintaining records of all subdomains in use.<\/span><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Focusing_on_Solution_%E2%80%93_Conclusion\"><\/span><span style=\"color: #000000;\"><b>Focusing on Solution &#8211; Conclusion<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">Keeping up with various types of phishing and implementing tools and systems can be overwhelming for brands. It&#8217;s, however, recommended to divert focus on solutions to ensure safety and seek aid from third-party experts for security.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\"><a href=\"https:\/\/threatcop.com\/\">Threatcop<\/a> helps organizations identify and protect the weakest link in the system against cyber threats. You can quickly start your domain security journey with us; <\/span><a style=\"color: #000000;\" href=\"https:\/\/threatcop.com\/contact-us\"><span style=\"font-weight: 400;\">contact <\/span><\/a><\/span><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\"><a href=\"https:\/\/threatcop.com\/contact-us\" target=\"_blank\"><span style=\"color:#000000\">us\u00a0<\/span><\/a>to<\/span> speak with an expert today<span style=\"color: #000000;\"><span style=\"font-weight: 400;\">!<\/span><\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<style>#sp-ea-14571 .spcollapsing { height: 0; overflow: hidden; transition-property: height;transition-duration: 300ms;}#sp-ea-14571.sp-easy-accordion>.sp-ea-single {margin-bottom: 10px; border: 1px solid #e2e2e2; }#sp-ea-14571.sp-easy-accordion>.sp-ea-single>.ea-header a {color: #444;}#sp-ea-14571.sp-easy-accordion>.sp-ea-single>.sp-collapse>.ea-body {background: #fff; color: #444;}#sp-ea-14571.sp-easy-accordion>.sp-ea-single {background: #eee;}#sp-ea-14571.sp-easy-accordion>.sp-ea-single>.ea-header a .ea-expand-icon { float: left; color: #444;font-size: 16px;}<\/style><div id=\"sp_easy_accordion-1779346412\"><div id=\"sp-ea-14571\" class=\"sp-ea-one sp-easy-accordion\" data-ea-active=\"ea-click\" data-ea-mode=\"vertical\" data-preloader=\"\" data-scroll-active-item=\"\" data-offset-to-scroll=\"0\"><div class=\"ea-card ea-expand sp-ea-single\"><h3 class=\"ea-header\"><span class=\"ez-toc-section\" id=\"What_is_subdomain_phishing\"><\/span><a class=\"collapsed\" id=\"ea-header-145710\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse145710\" aria-controls=\"collapse145710\" href=\"#\" aria-expanded=\"true\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-minus\"><\/i> What is subdomain phishing?<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3><div class=\"sp-collapse spcollapse collapsed show\" id=\"collapse145710\" data-parent=\"#sp-ea-14571\" role=\"region\" aria-labelledby=\"ea-header-145710\"> <div class=\"ea-body\"><p><span style=\"color: #000000\">Subdomain phishing is an attack where criminals take control of an abandoned or misconfigured subdomain of a legitimate brand. They use it to send phishing emails that appear to come from a trusted source.<\/span><\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_subdomain_phishing_and_subdomain_hijacking\"><\/span><a class=\"collapsed\" id=\"ea-header-145711\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse145711\" aria-controls=\"collapse145711\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is the difference between subdomain phishing and subdomain hijacking?<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse145711\" data-parent=\"#sp-ea-14571\" role=\"region\" aria-labelledby=\"ea-header-145711\"> <div class=\"ea-body\"><p><span style=\"color: #000000\">Subdomain hijacking is the method. Subdomain phishing is the outcome. An attacker hijacks the subdomain first, then uses it to run a phishing campaign.<\/span><\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><span class=\"ez-toc-section\" id=\"How_do_subdomain_phishing_emails_bypass_spam_filters\"><\/span><a class=\"collapsed\" id=\"ea-header-145712\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse145712\" aria-controls=\"collapse145712\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> How do subdomain phishing emails bypass spam filters?<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse145712\" data-parent=\"#sp-ea-14571\" role=\"region\" aria-labelledby=\"ea-header-145712\"> <div class=\"ea-body\"><p><span style=\"color: #000000\">The emails come from a subdomain with legitimate DNS records. SPF and DKIM checks pass because the sending infrastructure can be traced back to a real domain. Spam filters score it as trusted.<\/span><\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><span class=\"ez-toc-section\" id=\"How_do_I_check_if_my_subdomains_have_been_hijacked\"><\/span><a class=\"collapsed\" id=\"ea-header-145713\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse145713\" aria-controls=\"collapse145713\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> How do I check if my subdomains have been hijacked?<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse145713\" data-parent=\"#sp-ea-14571\" role=\"region\" aria-labelledby=\"ea-header-145713\"> <div class=\"ea-body\"><p><span style=\"color: #000000\">Run a full DNS audit of your domain. Look for CNAME records pointing to unclaimed services. Monitor DMARC reports for unexpected sending sources. Tools like TDMARC automate this process.<\/span><\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><span class=\"ez-toc-section\" id=\"Can_DMARC_prevent_subdomain_phishing\"><\/span><a class=\"collapsed\" id=\"ea-header-145714\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse145714\" aria-controls=\"collapse145714\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Can DMARC prevent subdomain phishing?<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse145714\" data-parent=\"#sp-ea-14571\" role=\"region\" aria-labelledby=\"ea-header-145714\"> <div class=\"ea-body\"><p><span style=\"color: #000000\">DMARC reduces the risk if it is configured correctly. You need to enforce a reject or quarantine policy at both the root and subdomain level. A misconfigured or permissive DMARC policy still leaves gaps.<\/span><\/p><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways Social engineering attacks succeed by exploiting trust, urgency, fear, and human error. Multi-factor authentication and email verification reduce the impact of credential theft attacks. Regular phishing simulations help employees recognize real-world attack patterns. Role-based security awareness training improves long-term behavioural change. Fast reporting and incident response reduce damage when social engineering attempts succeed. [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":11449,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-11445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-people-security-insights"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is Subdomain Phishing? 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