A developing threat activity cluster has been found using Google Ads in one of its campaigns to distribute various post-compromise payloads, including the recently discovered Royal ransomware.
Microsoft, which spotted the updated malware delivery method in late October 2022, is tracking the group under the name DEV-0569.
"Observed DEV-0569 attacks show a pattern of continuous innovation, with regular incorporation of new discovery techniques, defense evasion, and various post-compromise payloads, alongside increasing ransomware facilitation," the Microsoft Security Threat Intelligence team said in an analysis.
The threat actor is known to rely on malvertising to point unsuspecting victims to malware downloader links that pose as software installers for legitimate apps like Adobe Flash Player, AnyDesk, LogMeIn, Microsoft Teams, and Zoom.
The malware downloader, a strain referred to as BATLOADER, is a dropper that functions as a conduit to distribute next-stage payloads. It has been observed to share overlaps with another malware called ZLoader.
A recent analysis of BATLOADER by eSentire and VMware called out the malware's stealth and persistence, in addition to its use of search engine optimization (SEO) poisoning to lure users to download the malware from compromised websites or attacker-created domains.
Alternatively, phishing links are shared through spam emails, fake forum pages, blog comments, and even contact forms present on targeted organizations' websites.
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