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A menace actor used a Trojan installer for the Comm100 Stay Chat app to distribute a JavaScript backdoor.
Cybersecurity agency CrowdStrike has revealed particulars of a provide chain assault that concerned using a Trojan installer for the Comm100 Stay Chat app to distribute a JavaScript backdoor.
Comm100 is a supplier of customer support and communication merchandise serving greater than 200,000 companies. On the time of this writing, it’s unclear how lots of the firm’s clients had been affected by the assault.
The assault befell from at the very least September 27, 2022 to the morning of September 29, 2022. The malicious installer was used to contaminate organizations in a number of sectors, together with industrial, healthcare, know-how, manufacturing, insurance coverage, and telecommunications. in North America and Europe.
CrowdStrike researchers assess with reasonable confidence that the menace actor behind this provide chain assault probably has a nexus to China.
The malicious code was delivered by way of a signed Comm100 installer that could possibly be downloaded from the corporate’s web site.
“The malware is delivered by way of a signed Comm100 installer that may be downloaded from the corporate’s web site. The installer was signed on September 26, 2022 at 14:54:00 UTC with a sound certificates from Comm100 Community Company.” learn a report revealed by CrowdStrike. “CrowdStrike Intelligence can verify that the Microsoft Home windows 7+ desktop agent hosted on https[:]//script11.comm100[.]io/livechat/electron/10000/Comm100LiveChat-Setup-win.exe that was out there till the morning of September 29 was a Trojanized installer.”
Comm100 fastened the problem by releasing a clear and up to date installer, model 10.0.9.
The assembled executable was discovered to comprise JavaScript used to execute second-stage JavaScript code hosted on a distant server. This second-state Javascript establishes a distant shell on the contaminated system. The attackers additionally carried out a malicious loader DLL referred to as MidlrtMd.dll that launches an in-memory shellcode to inject an embedded payload into a brand new occasion of notepad.exe.
“The injected payload connects to the malicious C2 area api.microsoftfileapis[.]com, which resolved to the IP handle 8.219.167[.]156 on the time of the incident.” report continues.
The attackers used the Microsoft Metadata Merge Utility binary to load the MidlrtMd DLL.
“Moreover, CrowdStrike Intelligence assesses with reasonable confidence that this actor probably has a nexus to China. This evaluation is predicated on the presence of Chinese language-language commentary on the malware, the aforementioned techniques, strategies, and procedures (TTPs), and connection to the choice of on-line gaming entities in East and Southeast Asia, an space method beforehand established for China. -Nexus focused intrusion actors. CrowdStrike Intelligence clients have entry to extra reviews associated to this actor.”
The report consists of Indicators of Compromise (IoC) for this assault.
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Pierluigi Paganini
(SecurityIssues – hacking, Comm100)
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Trojanized Comm100 Live Chat app installer distributed a JavaScript backdoorSecurity Affairs
