{"id":39902,"date":"2021-03-08T15:27:53","date_gmt":"2021-03-08T15:27:53","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/32086\/Ten-Of-Thousands-Of-Orgs-Hit-In-Ongoing-Exchange-Hack.html"},"modified":"2021-03-08T15:27:53","modified_gmt":"2021-03-08T15:27:53","slug":"ten-of-thousands-of-orgs-hit-in-ongoing-exchange-hack","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/ten-of-thousands-of-orgs-hit-in-ongoing-exchange-hack\/","title":{"rendered":"Ten Of Thousands Of Orgs Hit In Ongoing Exchange Hack"},"content":{"rendered":"<figure class=\"intro-image intro-left\"><img decoding=\"async\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2020\/10\/malware-800x600.jpg\" alt=\"A stylized skull and crossbones made out of ones and zeroes.\"><figcaption class=\"caption\"><\/figcaption><\/figure>\n<aside id=\"social-left\" class=\"social-left\" aria-label=\"Read the comments or share this article\"><a title=\"65 posters participating\" class=\"comment-count icon-comment-bubble-down\" href=\"https:\/\/arstechnica.com\/gadgets\/2021\/03\/tens-of-thousands-of-us-organizations-hit-in-ongoing-microsoft-exchange-hack\/?comments=1\"> <\/p>\n<h4 class=\"comment-count-before\">reader comments<\/h4>\n<p> <span class=\"comment-count-number\">101<\/span> <span class=\"visually-hidden\"> with 65 posters participating<\/span> <\/a> <\/p>\n<div class=\"share-links\">\n<h4>Share this story<\/h4>\n<\/p><\/div>\n<\/aside>\n<p><!-- cache hit 54:single\/related:a658cd7a3d560693501ce35dafba4046 --><!-- empty -->Tens of thousands of US-based organizations are running Microsoft Exchange servers that have been backdoored by threat actors who are stealing administrator passwords and exploiting critical vulnerabilities in the email and calendaring application, it was widely reported. Microsoft <a href=\"https:\/\/arstechnica.com\/information-technology\/2021\/03\/microsoft-issues-emergency-patches-for-4-exploited-0days-in-exchange\/\">issued<\/a> emergency patches on Tuesday, but they do nothing to disinfect systems that are already compromised.<\/p>\n<p>KrebsOnSecurity was the <a href=\"https:\/\/krebsonsecurity.com\/2021\/03\/at-least-30000-u-s-organizations-newly-hacked-via-holes-in-microsofts-email-software\/\">first to report<\/a> the mass hack. Citing multiple unnamed people, reporter Brian Krebs put the number of compromised US organizations at at least 30,000. Worldwide, Krebs said there were at least 100,000 hacked organizations. Other news outlets, also citing unnamed sources, quickly followed with <a href=\"https:\/\/www.wired.com\/story\/china-microsoft-exchange-server-hack-victims\/\">posts<\/a> <a href=\"https:\/\/www.reuters.com\/article\/us-usa-cyber-microsoft\/more-than-20000-u-s-organizations-compromised-through-microsoft-flaw-source-idUSKBN2AX23U\">reporting<\/a> the hack had hit <a href=\"https:\/\/www.wsj.com\/articles\/china-linked-hack-hits-tens-of-thousands-of-u-s-microsoft-customers-11615007991\">tens of thousands<\/a> of organizations in the US.<\/p>\n<h2>Assume compromise<\/h2>\n<p>\u201cThis is the real deal,\u201d Chris Krebs, the former head of the Cybersecurity and Infrastructure Security Agency, <a href=\"https:\/\/twitter.com\/C_C_Krebs\/status\/1367673471669526528\">said<\/a> on Twitter, referring to the attacks on on-premisis Exchange, which is also known as Outlook Web Access. \u201cIf your organization runs an OWA server exposed to the internet, assume compromise between 02\/26-03\/03.\u201d His comments accompanied a Tweet on Thursday from Jake Sullivan, the White House national security advisor to President Biden.<\/p>\n<div class=\"twitter-tweet\">\n<blockquote class=\"twitter-tweet\" data-lang=\"en\">\n<p lang=\"en\" dir=\"ltr\">This is the real deal. If your organization runs an OWA server exposed to the internet, assume compromise between 02\/26-03\/03. Check for 8 character aspx files in C:\\\\inetpub\\wwwroot\\aspnet_client\\system_web\\. If you get a hit on that search, you\u2019re now in incident response mode. <a href=\"https:\/\/t.co\/865Q8cc1Rm\">https:\/\/t.co\/865Q8cc1Rm<\/a><\/p>\n<p>\u2014 Chris Krebs (@C_C_Krebs) <a href=\"https:\/\/twitter.com\/C_C_Krebs\/status\/1367673471669526528?ref_src=twsrc%5Etfw\">March 5, 2021<\/a><\/p><\/blockquote>\n<\/div>\n<h2>Hafnium has company<\/h2>\n<p>Microsoft on Tuesday said on-premises Exchange servers were being hacked in \u201climited targeted attacks\u201d by a China-based hacking group the software maker is calling Hafnium. Following Friday\u2019s post from Brian Krebs, Microsoft updated its <a href=\"https:\/\/www.microsoft.com\/security\/blog\/2021\/03\/02\/hafnium-targeting-exchange-servers\/\">post<\/a> to say that it was seeing \u201cincreased use of these vulnerabilities in attacks targeting unpatched systems by multiple malicious actors beyond HAFNIUM.\u201d<\/p>\n<p>Katie Nickels, director of intelligence at security firm Red Canary, told Ars that her team has found Exchange servers that were compromised by hackers using tactics, techniques, and procedures that are distinctly different than those used by the Hafnium group Microsoft named. She said Red Canary has counted five \u201cclusters that look differently from each other, [though] telling if the people behind those are different or not is really challenging and unclear right now.\u201d<\/p>\n<aside class=\"ad_wrapper\" aria-label=\"In Content advertisement\"> <span class=\"ad_notice\">Advertisement <\/span> <\/aside>\n<p>On Twitter, Red Canary <a href=\"https:\/\/twitter.com\/redcanary\/status\/1367935292724948992\">said<\/a> that some of the compromised Exchange servers the company has tracked ran malware that fellow security firm Carbon Black <a href=\"https:\/\/www.carbonblack.com\/blog\/cb-tau-technical-analysis-dltMiner-campaign-targeting-corporations-in-asia\/\">analyzed<\/a> in 2019. The malware was part of an attack that installed cryptomining software called DLTminer. It&#8217;s unlikely Hafnium would install a payload like that.<\/p>\n<p>Microsoft said that Hafnium is a skilled hacking group from China that focuses primarily on stealing data from US-based infectious disease researchers, law firms, higher-education institutions, defense contractors, policy think tanks, and nongovernmental organizations. The group, Microsoft said, was hacking servers by either exploiting the recently fixed zeroday vulnerabilities or by using compromised administrator credentials.<\/p>\n<p>It\u2019s not clear what percentage of infected servers are the work of Hafnium. Microsoft on Tuesday warned that the ease of exploiting the vulnerabilities made it likely other hack groups would soon join Hafnium. If ransomware groups aren\u2019t yet among the clusters compromising servers, it\u2019s almost inevitable that they soon will be.<\/p>\n<h2>Backdooring servers<\/h2>\n<p>Brian Krebs and others reported that tens of thousands of Exchange servers had been compromised with a webshell, which hackers install once they\u2019ve gained access to a server. The software allows attackers to enter administrative commands through a terminal Window that\u2019s accessed through a web browser.<\/p>\n<p>Researchers have been careful to note that simply installing the patches Microsoft issued in Tuesday\u2019s emergency release would do nothing to disinfect servers that have already been backdoored. The webshells and any other malicious software that have been installed will persist until it is actively removed, ideally by completely rebuilding the server.<\/p>\n<p>People who administer Exchange servers in their networks should drop whatever they\u2019re doing right now and carefully inspect their machines for signs of compromise. Microsoft has listed indicators of compromise <a href=\"https:\/\/www.microsoft.com\/security\/blog\/2021\/03\/02\/hafnium-targeting-exchange-servers\/\">here<\/a>. Admins can also use <a href=\"https:\/\/github.com\/microsoft\/CSS-Exchange\/tree\/main\/Security\">this script<\/a> from Microsoft to test if their environments are affected.<\/p>\n<p>This week\u2019s escalation of Exchange server hacks comes three months after security professionals uncovered the hack of at least nine federal agencies and about 100 companies. The primary vector for infections was through software updates from network tools maker SolarWinds. The mass hack was one of\u2014if not <em>the<\/em>\u2014the worst computer intrusions in US history. It\u2019s possible the Exchange Server will soon claim that distinction.<\/p>\n<p>There\u2019s still much that remains unknown. For now, people would do well to follow Chris Krebs\u2019 advice to assume on-premises servers are compromised and act accordingly.<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/32086\/Ten-Of-Thousands-Of-Orgs-Hit-In-Ongoing-Exchange-Hack.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":39903,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[8489],"class_list":["post-39902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlinehackermicrosoftemaildata-lossflaw"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ten Of Thousands Of Orgs Hit In Ongoing Exchange Hack 2026 | 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