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Home > Cybersecurity > Malicious redirects hit WordPress sites

Malicious redirects hit WordPress sites

Sucuri team found a malicious JavaScript injection within the WordPress index.php theme file on a compromised WordPress website.

Erdem Yasar by Erdem Yasar
January 28, 2020
in Cybersecurity
1 min read
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Malicious redirects hit WordPress sites
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Sucuri announced that its security team found a JavaScript injection that redirects site visitors to a survey-for-gifts scam website. According to Sucuri’s blog post, at least 2,000 websites are infected with the redirect. Malicious JavaScript payload is capable of making modifications to existing WordPress theme files via the /wp-admin/theme-editor.php file. This allows them to inject additional malware, such as PHP backdoors and hack tools, to other theme files so they can continue to maintain unauthorized access to the infected website.

Injection of additional malware

The attackers also change home and siteurl defined in the wp_options table. This causes site visitors to be redirected to malicious websites affiliated with the attacker and is likely one of the first red flags of malicious behavior. The attackers create a variable with the name ijmjg and use the function String.fromCharCode() to hide the malicious redirect URL in UTF-16 code units format, rather than ASCII characters.

Another interesting finding is the creation of fake plugin directories that contain further malware and can also be generated through the attacker’s abuse of /wp-admin/ features, namely uploading zip compressed files using the /wp-admin/includes/plugin-install.php file to perform the upload and unzipping of the compressed fake plugin into /wp-content/plugins/.

The two most common fake plugin directories we’ve seen created alongside this malware are /wp-content/plugins/supersociall/supersociall.php and /wp-content/plugins/blockspluginn/blockspluginn.php.

See more Cyber Security News


Tags: MalwareSucuriVulnerabilityWordPress
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Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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