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CYFIRMA Research - Exploiting Document Templates: Stego-Campaign Deploying Remcos RAT and Agent Tesla
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Our latest cyber threat research at Cyfirma reveals a complex stego-campaign, showcasing a malicious .docx file that's raising serious concerns in the cybersecurity landscape. Our dedicated team unearthed a sophisticated attack chain that employs template injection, effectively bypassing conventional email security measures.
The malicious .docx file, distributed possibly through phishing emails, sets off a multi-stage attack upon opening. The attack involves the deployment of the Remcos Remote Access Trojan (RAT) and the notorious Agent Tesla malware, each with its set of malicious functionalities. Notably, the document, seemingly benign on the surface, contains a targeted approach, hinting at a potential focus on Taiwan.
Our research dives deep into the sophisticated process, unraveling the use of Visual Basic and PowerShell scripts, legitimate binaries like "RegAsm" and "WinRm," and the exploitation of the Equation Editor Vulnerability (CVE-2017-11882). The attack showcases a high level of sophistication, utilizing Living Off the Land Binary (LoLBin) binaries to accomplish malicious objectives.
As we consistently monitor emerging threats, our team unveiled similar samples with a common upload date, indicating a coordinated effort rather than random activity. This underlines the possibility of a purposeful campaign orchestrated by threat actors.
Our commitment at Cyfirma is to anticipate and scrutinize evolving cyber threats, providing insights to fortify the cybersecurity landscape. The detailed report sheds light on the entire attack chain, emphasizing the need for proactive measures against such advanced threats.
Link to the Research Report: Exploiting Document Templates: Stego-Campaign Deploying Remcos RAT and Agent Tesla - CYFIRMA
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