{"id":40438,"date":"2021-04-14T10:24:00","date_gmt":"2021-04-14T10:24:00","guid":{"rendered":"http:\/\/fe29af8b-3a5d-41fd-a842-4e67a0714d50"},"modified":"2021-04-14T10:24:00","modified_gmt":"2021-04-14T10:24:00","slug":"cyber-criminals-are-installing-cryptojacking-malware-on-unpatched-microsoft-exchange-servers","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/cyber-criminals-are-installing-cryptojacking-malware-on-unpatched-microsoft-exchange-servers\/","title":{"rendered":"Cyber criminals are installing cryptojacking malware on unpatched Microsoft Exchange servers"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/www.zdnet.com\/a\/hub\/i\/r\/2019\/09\/18\/0ec53b01-198c-4f5b-baaa-7f837fc95ffe\/thumbnail\/770x578\/0aede350dd4bd76ae6dce5e4b24f8b61\/istock-1050764906.jpg\" class=\"ff-og-image-inserted\"><\/div>\n<p>Cyber criminals are targeting vulnerable Microsoft Exchange servers with cryptocurrency mining malware in a campaign designed to secretly use the processing power of compromised systems to make money.&nbsp; <\/p>\n<p><a href=\"https:\/\/www.zdnet.com\/article\/everything-you-need-to-know-about-microsoft-exchange-server-hack\/\">Zero-day vulnerabilities in Microsoft Exchange Server<\/a> were detailed last month when Microsoft <a href=\"https:\/\/www.zdnet.com\/article\/update-immediately-microsoft-rushes-out-patches-for-exchange-server-zero-day-attacks\/\">released critical security updates <\/a>to prevent the exploitation of vulnerable systems. <\/p>\n<div class=\"relatedContent alignRight\">\n<h3 class=\"heading\"> <span class=\"int\">Exchange attacks<\/span> <\/h3>\n<\/p><\/div>\n<p>Cyber attackers ranging from&nbsp;<a href=\"https:\/\/www.zdnet.com\/article\/microsoft-exchange-server-cybersecurity-warning-apply-patches-now-because-more-hacking-groups-are-trying-to-exploit-the-vulnerabilities\/\">nation-state-linked hacking groups<\/a> to ransomware gangs have rushed to take advantage of unpatched Exchange servers &#8212; but they&#8217;re not the only ones. <\/p>\n<p><strong><strong>SEE:&nbsp;<\/strong><a href=\"https:\/\/www.techrepublic.com\/resource-library\/whitepapers\/network-security-policy\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\"><strong>Network security policy<\/strong><\/a>&nbsp;<strong>(TechRepublic Premium)<\/strong><\/strong> <\/p>\n<p><a href=\"https:\/\/news.sophos.com\/en-us\/2021\/04\/13\/compromised-exchange-server-hosting-cryptojacker-targeting-other-exchange-servers\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">Cybersecurity researchers at Sophos<\/a> have identified attackers attempting to take advantage of the Microsoft Exchange Server ProxyLogon exploit to secretly install a <a href=\"https:\/\/www.zdnet.com\/article\/cyber-attackers-are-cashing-in-on-cryptocurrency-mining-but-heres-why-theyre-avoiding-bitcoin\/\">Monero cryptominer<\/a> on Exchange servers. <\/p>\n<p>&#8220;Server hardware is pretty desirable for cryptojacking because it usually has a higher performance than a desktop or laptop. Because the vulnerability permits the attackers to simply scan the whole internet for available, vulnerable machines, and then roll them into the network, it&#8217;s basically free money rolling in for the attackers,&#8221; Andrew Brandt, principal threat researcher at Sophos, told ZDNet. <\/p>\n<p>Monero isn&#8217;t nearly as valuable as Bitcoin, but it&#8217;s easier to mine and, crucially for cyber criminals, provides greater anonymity, making the owner of the wallet &#8212; and those behind attacks &#8212; harder to trace. <\/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;}\"> <\/section>\n<p>While being compromised by a cryptocurrency miner might not sound as bad as a ransomware attack or the loss of sensitive data, it still represents a concern for organisations. <\/p>\n<p>That&#8217;s because it means cyber attackers have been able to secretly gain access to the network and, crucially, that the organisation still hasn&#8217;t applied the critical updates designed to protect against all manner of attacks. <\/p>\n<p>According to analysis by Sophos, the Monero wallet of the attacker behind this campaign began receiving funds from mining on March 9, just a few days after the Exchange vulnerabilities came to light, suggesting the attacker was quick off the mark in exploiting unpatched servers. <\/p>\n<p>The attacks begin with a PowerShell command that retrieves a file from a previously compromised server&#8217;s Outlook Web Access logon path, which in turn downloads executable payloads to install the Monero miner. <\/p>\n<p>Researchers note that the executable appears to contain a modified version of a tool that&#8217;s publicly available on Github; when the content is run on a compromised server, evidence of installation is deleted, while the mining process runs in memory. <\/p>\n<p><strong>SEE: <\/strong><a href=\"https:\/\/www.zdnet.com\/article\/cybercrime-groups-are-selling-their-hacking-skills-some-countries-are-buying\/\"><strong>Cybercrime groups are selling their hacking skills. Some countries are buying<\/strong><\/a> <\/p>\n<p>It&#8217;s unlikely that the operators of servers that have been hijacked by crypto-mining <a href=\"https:\/\/www.zdnet.com\/article\/what-is-malware-everything-you-need-to-know-about-viruses-trojans-and-malicious-software\/\" target=\"_blank\" rel=\"noopener noreferrer\">malware<\/a> will notice there&#8217;s an issue &#8212; unless the attacker gets greedy and uses an extensive amount of processing power that&#8217;s easily identified as unusual. <\/p>\n<p>To protect networks against attacks that exploit the vulnerabilities in Microsoft Exchange Server, <a href=\"https:\/\/www.zdnet.com\/article\/microsoft-exchange-server-zero-day-attacks-malicious-software-found-on-2300-machines-in-uk\/\">organisations are urged to apply the critical security updates as a matter of immediate priority<\/a>. <\/p>\n<p>&#8220;A lot of this speaks to the need for servers, especially internet-facing servers, to be running modern endpoint protection on them. Other than that, Microsoft has spelled out pretty clearly what&#8217;s needed to patch the vulnerabilities, so admins need to just be diligent and do those things,&#8221; said Brandt. <\/p>\n<h3> <strong>MORE ON CYBERSECURITY<\/strong> <\/h3>\n<p> READ MORE <a href=\"https:\/\/www.zdnet.com\/article\/free-money-cyber-criminals-are-installing-cryptojacking-malware-on-unpatched-microsoft-exchange-servers\/#ftag=RSSbaffb68\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cyber attackers are scanning the internet for vulnerable Microsoft Exchange servers they can exploit to mine for cryptocurrency. &#8220;It&#8217;s basically free money rolling in for the attackers,&#8221; warn cybersecurity researchers.<br \/>\nREAD MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":40439,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[62],"tags":[],"class_list":["post-40438","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 v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cyber criminals are installing cryptojacking malware on unpatched Microsoft Exchange servers 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\" 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