Other endpoint security solutions have also begun to flag both the 3CX desktop applications and installer files as malicious. The second-stage payloads were used to download a third-stage information stealer, allowing attackers to collect information such as browser history from popular browsers like Google Chrome, Microsoft Edge, Brave and Mozilla Firefox.ģCX customers reported receiving threat alerts from SentinelOne as early as March 22. Hands-on-keyboard activity (limited cases)Īccording to newly disclosed research into the attack, the second-stage payloads appear to have been hosted on a public GitHub repository that has since been removed.Retrieving and deploying “second-stage payloads”.Connecting back to infrastructure associated with the threat actors.
Researchers report that the trojanized applications have been observed: What do these trojanized versions of the 3CX desktop applications do? On March 30, 3CX CISO Pierre Jourdan published a blog post that lists additional trojanized 3CX desktop app versions for macOS:
On March 29, a post on the CrowdStrike subreddit revealed that the 3CX desktop app, a softphone client for both Windows and Mac, was compromised and trojanized.ĭo we know which versions of the 3CX desktop apps are vulnerable?Īs of March 29, based on what has been shared publicly by researchers, the following versions of the 3CX desktop apps are considered to be affected:Īa124a4b4df12b34e74ee7f6c683b2ebec4ce9a8edcf9be345823b4fdcf5d868ĥ9e1edf4d82fae4978e97512b0331b7eb21dd4b838b850ba46794d9c7a2c0983ĥ407cda7d3a75e7b1e030b1f33337a56f293578ffa8b3ae19c671051ed314290Į6bbc33815b9f20b0cf832d7401dd893fbc467c800728b5891336706da0dbcec Additional changes made after publication can be tracked in the changelog below. The information presented in this blog post was current as of March 29. Update March 30 #4: This blog has been updated to reflect the availability of a version check plugin for the 3CX desktop apps containing malware, an updated version of the 3CX DesktopApp for Windows and macOS, a CVE identifier (CVE-2023-29059) assigned for this issue and clarifications on the supply chain attack and nation-state connection.įollowing a report that software made by 3CX - developers of a popular Voice over Internet Protocol (VoIP) Private Branch Exchange (PBX) phone system - was compromised as part of an “active intrusion campaign” targeting 3CX customers, Tenable’s Security Response Team (SRT) has prepared this frequently asked questions (FAQ) blog detailing what we know about the attack thus far.
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