{"id":18583,"date":"2018-11-09T15:38:25","date_gmt":"2018-11-09T15:38:25","guid":{"rendered":"http:\/\/d78beab3-9c94-41b1-876f-08be5e6e48b7"},"modified":"2018-11-09T15:38:25","modified_gmt":"2018-11-09T15:38:25","slug":"linux-cryptocurrency-miners-are-installing-rootkits-to-hide-themselves","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/linux-cryptocurrency-miners-are-installing-rootkits-to-hide-themselves\/","title":{"rendered":"Linux cryptocurrency miners are installing rootkits to hide themselves"},"content":{"rendered":"<p>Security researchers from Trend Micro have stumbled upon a new malware strain that mines cryptocurrency on Linux computers, but which is also different from previously seen cryptominers because it downloads a rootkit to alter the operating system&#8217;s behavior and hide the unwanted high CPU usage that usually comes with cryptocurrency mining.<\/p>\n<p>Currently, Trend Micro has not identified the way through which the malware &#8211;which they named KORKERDS&#8211; infects systems, but they don&#8217;t believe this recent wave of infections is the result of an intrusive mass-hacking campaign.<\/p>\n<p>Instead, researchers believe crooks are using poisoned Linux applications that have been modified to silently download and install the KORKERDS cryptominers during the installation process of a legitimate app. Which app? Trend Micro hasn&#8217;t figured that out yet.<\/p>\n<p>But researcher did say that the KORKERDS samples they&#8217;ve recently analyzed would do more than just install a Monero miner &#8211;also downloading and installing a rootkit, which they described as &#8220;a slightly modified\/repurposed version of publicly available code.&#8221;<\/p>\n<p><span class=\"img aspect-set\"><img decoding=\"async\" src=\"https:\/\/zdnet2.cbsistatic.com\/hub\/i\/r\/2018\/11\/09\/9cfc7630-144e-4a37-8f5c-6af223521d42\/resize\/370xauto\/1c3b382094300813c18af446833843ff\/korkerds-installation.jpg\" class=\"\" alt=\"korkerds-installation.jpg\" height=\"auto\" width=\"370\"\/><\/span> <span class=\"credit\">Image: Trend Micro<\/span><\/p>\n<p>Besides allowing KORKERDS to survive OS reboots, the rootkit component also contained code a slightly strange feature.<\/p>\n<p>Trend Micro says that KORKERDS&#8217; authors modified the rootkit to hide the cryptominer&#8217;s main process from Linux&#8217;s native process monitoring tools.<\/p>\n<p>&#8220;The rootkit hooks the readdir and readdir64 application programming interfaces (APIs) of the libc library,&#8221; researchers said. &#8220;The rootkit will override the normal library file by replacing the normal readdir file with the rootkit&#8217;s own version of readdir.&#8221;<\/p>\n<section class=\"sharethrough-top\" data-component=\"medusaContentRecommendation\" data-medusa-content-recommendation-options=\"{&quot;promo&quot;:&quot;promo_ZD_recommendation_sharethrough_top_in_article_desktop&quot;,&quot;spot&quot;:&quot;dfp-in-article&quot;}\">\n<\/section>\n<p>This malicious version of readdir works by hiding processes named &#8220;kworkerds&#8221; &#8211;which in this case is the cryptominers&#8217; process.<\/p>\n<p>Linux process monitoring tools will still show 100 percent CPU usage, but admins won&#8217;t be able to see (and kill) the kworkerds process causing the CPU resource consumption problems.<\/p>\n<p><span class=\"img aspect-set\"><img decoding=\"async\" src=\"https:\/\/www.zdnet.com\/article\/linux-cryptocurrency-miners-are-installing-rootkits-to-hide-themselves\/\" class=\"lazy\" alt=\"korkerds-process-monitoring.png\" data-original=\" https:\/\/zdnet3.cbsistatic.com\/hub\/i\/2018\/11\/09\/69604e1f-c10a-4e18-be8e-5cbbda7ea221\/3d5b0c8e214b69686612e0e379478674\/korkerds-process-monitoring.png\"\/><\/span><noscript><\/p>\n<p><span class=\"img aspect-set\"><img decoding=\"async\" src=\"https:\/\/zdnet3.cbsistatic.com\/hub\/i\/2018\/11\/09\/69604e1f-c10a-4e18-be8e-5cbbda7ea221\/3d5b0c8e214b69686612e0e379478674\/korkerds-process-monitoring.png\" class=\"\" alt=\"korkerds-process-monitoring.png\"\/><\/span><\/p>\n<p><\/noscript><\/p>\n<p><span class=\"caption\">Linux process monitoring tool showing 100% CPU usage, but kworkerds process responsible for this problem<\/span><\/p>\n<p><span class=\"credit\">Image: Trend Micro<\/span><\/p>\n<p>Trend Micro&#8217;s KORKERDS report contains a <a href=\"https:\/\/www.trendmicro.com\/vinfo\/us\/security\/news\/cybercrime-and-digital-threats\/cryptocurrency-mining-malware-targets-linux-systems-uses-rootkit-for-stealth\" target=\"_blank\" rel=\"noopener noreferrer\">technical breakdown<\/a> of the malware&#8217;s infection routine, including file names, processes, and file hashes that Linux users may be interested in tracking and using for debugging possibly-infected systems.<\/p>\n<p>Based on the fact that KORKERDS is distributed inside legitimate apps, this also suggests the malware might also be a threat to Linux desktop users as well, and not only to servers, where almost all Linux cryptominers have been observed in the past two years.<\/p>\n<p>Linux users weren&#8217;t the only ones that have been targeted by sneaky cryptocurrency-mining malware. Trend Micro also published <a href=\"https:\/\/blog.trendmicro.com\/trendlabs-security-intelligence\/cryptocurrency-mining-malware-uses-various-evasion-techniques-including-windows-installer-as-part-of-its-routine\/\" target=\"_blank\" rel=\"noopener noreferrer\">a second report<\/a> yesterday on another malware strain that targeted Windows users and which also used various techniques in an attempt of staying hidden as much as possible on infected systems.<\/p>\n<h3>Related coverage:<\/h3>\n<p>READ MORE <a href=\"https:\/\/www.zdnet.com\/article\/linux-cryptocurrency-miners-are-installing-rootkits-to-hide-themselves\/#ftag=RSSbaffb68\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rootkit component hides the crypto-mining process that causes high CPU usage from local, built-in Linux process monitoring utilities.<br \/>\nREAD MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":18584,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[62],"tags":[],"class_list":["post-18583","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zdnet-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Linux cryptocurrency miners are installing rootkits to hide themselves 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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