A sophisticated, likely government-sponsored threat actor has been compromising major public and private organizations over the past year by exploiting deserialization flaws in public-facing ASP.NET applications to deploy fileless malware. Dubbed Praying Mantis, or TG1021, by researchers from incident response firm Sygnia, the hacker group puts a strong focus on detection evasion by using a volatile and custom malware toolset built specifically for Internet Information Services (IIS) web servers to perform credential harvesting, reconnaissance and lateral movement.
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