{"id":59211,"date":"2025-08-19T20:28:11","date_gmt":"2025-08-19T20:28:11","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/like-burglars-closing-a-door-apache-activemq-attackers-patch-critical-vuln-after-breaking-in\/"},"modified":"2025-08-19T20:28:11","modified_gmt":"2025-08-19T20:28:11","slug":"like-burglars-closing-a-door-apache-activemq-attackers-patch-critical-vuln-after-breaking-in","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/like-burglars-closing-a-door-apache-activemq-attackers-patch-critical-vuln-after-breaking-in\/","title":{"rendered":"Like burglars closing a door, Apache ActiveMQ attackers patch critical vuln after breaking in"},"content":{"rendered":"<p>Criminals exploiting a critical vulnerability in open source Apache ActiveMQ middleware are fixing the flaw that allowed them access, after establishing persistence on Linux servers.<\/p>\n<p>Researchers at security house <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/redcanary.com\/blog\/threat-intelligence\/dripdropper-linux-malware\/\">Red Canary<\/a> observed attackers using a new form of Linux malware, dubbed DripDropper, against dozens of systems running Apache&#8217;s Java-based message broker. The miscreants got in using <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/cve-2023-46604\">CVE-2023-46604<\/a>, a CVSS 9.8 critical flaw that Apache itself rates as a perfect 10. After installing a backdoor to the infected systems, they then downloaded two Java Archive (JAR) files that effectively patched the original vuln.<\/p>\n<p>&#8220;This kind of behavior is very uncommon, we see it very rarely,&#8221; Brian Donohue, principal researcher at Red Canary, told <i>The Register<\/i>. &#8220;I think we&#8217;ve only seen it once before and it&#8217;s not something that happens very often. Most threats are pretty much point and play and don&#8217;t often include this sort of really customized trick.&#8221;<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,dmpu,\" data-sm=\",fluid,mpu,dmpu,\" data-md=\",fluid,mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/cybercrime&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2aKTh1WaiTdwJBlxY4P_uoAAAAIU&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/cybercrime&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2aKTh1WaiTdwJBlxY4P_uoAAAAIU&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The criminals gained access using a Sliver implant &#8211; a legitimate tool for pentesters but one which is also much abused by black hats &#8211; to modify the sshd configuration file of the target machine to allow root access. They then downloaded DripDropper, an encrypted PyInstaller-built ELF that communicates with an attacker-controlled Dropbox account, to maintain control over compromised Linux servers.<\/p>\n<p>While patching the systems after infection will help conceal the intrusion from vulnerability scanners, there is a second line of defense against detection. DripDropper &#8211; so named because it uses Dropbox to shuttle files back and forth &#8211; is password protected, making it tougher to access and analyze by bug hunters seeking to find a way to kill off the code, Donohue explained.<\/p>\n<p>&#8220;The actions of this file changed from instance to instance, ranging from process monitoring to contacting Dropbox for further instructions,&#8221; the Red Canary team said in its <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/redcanary.com\/blog\/threat-intelligence\/dripdropper-linux-malware\/\">report<\/a>. &#8220;DripDropper will establish persistent execution for the dropped file by modifying the 0anacron file observed in each \/etc\/cron.*\/ directory.&#8221;<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/cybercrime&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44aKTh1WaiTdwJBlxY4P_uoAAAAIU&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/cybercrime&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44aKTh1WaiTdwJBlxY4P_uoAAAAIU&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/cybercrime&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33aKTh1WaiTdwJBlxY4P_uoAAAAIU&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/cybercrime&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33aKTh1WaiTdwJBlxY4P_uoAAAAIU&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>&#8220;It typically modifies existing configuration files related to SSH, including altering the default login shell for user account games to \/bin\/sh. This action presumably prepared the system for additional persistent access via the games account where the adversary could issue shell commands.&#8221;<\/p>\n<p>Once they have installed malware on the system, and hidden it from view with the downloaded patch, attackers deliver new payloads, Donohue explained. This could include uploading information-stealing code, installing ransomware, or downloading network access tools that the miscreants can use to spread to infect other machines.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",fluid,mpu,dmpu,\" data-sm=\",fluid,mpu,dmpu,\" data-md=\",fluid,mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/cybercrime&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44aKTh1WaiTdwJBlxY4P_uoAAAAIU&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/cybercrime&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44aKTh1WaiTdwJBlxY4P_uoAAAAIU&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>In theory, this flaw shouldn&#8217;t be an issue, because Apache patched CVE-2023-46604 <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/www.theregister.com\/2023\/11\/02\/apache_activemq_vulnerability\/\">way back<\/a> in late October 2023. But IT departments are perennially overstretched when it comes to patching and, despite its seriousness, there are still a lot of vulnerable systems out there.<\/p>\n<p>Then again, vendors aren&#8217;t helping. Oracle only <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2025\/01\/23\/oracle_patch_linux\/\">included a patch<\/a> for the flaw back in January of this year, for example, despite researchers warning of attacks using the vulnerability for over a year before Oracle got around to including a fix.<\/p>\n<p>If you&#8217;re trusting Big Red to deliver timely patches, maybe it&#8217;s time to rethink your security strategy, as the biz is notorious for tardy software fixes, typically only releasing four software updates a year. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2025\/08\/19\/apache_activemq_patch_malware\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Intruders hoped no one would notice their presence Criminals exploiting a critical vulnerability in open source Apache ActiveMQ middleware are fixing the flaw that allowed them access, after establishing persistence on Linux servers.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-59211","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Like burglars closing a door, Apache ActiveMQ attackers patch critical vuln after breaking in 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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