The initial target compromise happened via the Log4j vulnerability against an unpatched VMWare Horizon Server. The attackers modified the Blast Secure Gateway component of the application installing a web shell using PowerShell code found documented here.
Once initial access had been achieved, the threat actors performed a series of enumeration commands and attempted to run multiple post-exploitation tools, including Meterpreter, PowerShell Empire and a new way to side-load Cobalt Strike.
In particular, when attempting to execute Cobalt Strike, Sentinel One observed a new legitimate tool used for side-loading a malicious DLL, that decrypts the payload.
Previously observed techniques to evade defenses by removing EDR/EPP’s userland hooks, Event Tracing for Windows and Antimalware Scan Interface were also observed.
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