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Decrypted: HomuWitch Ransomware

HomuWitch is a ransomware strain that initially emerged in July 2023. Unlike the majority of current ransomware strains, HomuWitch targets end-users – individuals – rather than institutions and companies. Its prevalence isn’t remarkably large, nor is the requested ransom payment amount, which has allowed the strain to stay relatively under the radar thus far. During…

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Lazarus and the FudModule Rootkit: Beyond BYOVD with an Admin-to-Kernel Zero-Day

Key Points Avast discovered an in-the-wild admin-to-kernel exploit for a previously unknown zero-day vulnerability in the appid.sys AppLocker driver.  Thanks to Avast’s prompt report, Microsoft addressed this vulnerability as CVE-2024-21338 in the February Patch Tuesday update.  The exploitation activity was orchestrated by the notorious Lazarus Group, with the end goal of establishing a kernel read/write…

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From BYOVD to a 0-day: Unveiling Advanced Exploits in Cyber Recruiting Scams

Key Points Avast discovered a new campaign targeting specific individuals through fabricated job offers.  Avast uncovered a full attack chain from infection vector to deploying “FudModule 2.0” rootkit with 0-day Admin -> Kernel exploit.  Avast found a previously undocumented Kaolin RAT, where it could aside from standard RAT functionality, change the last write timestamp of…

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GuptiMiner: Hijacking Antivirus Updates for Distributing Backdoors and Casual Mining

Key Points Avast discovered and analyzed a malware campaign hijacking an eScan antivirus update mechanism to distribute backdoors and coinminers Avast disclosed the vulnerability to both eScan antivirus and India CERT. On 2023-07-31, eScan confirmed that the issue was fixed and successfully resolved The campaign was orchestrated by a threat actor with possible ties to…

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