Imagine surviving a wiper attack only for ransomware to scramble your restored files
It's not yet clear how victims' networks were compromised by the extortionists to run their file-scrambling malware. Before the intruders deployed Prestige, though, they were said to be in control of the systems via two remote-execution tools, the commercially available RemoteExec, and the open-source Impacket WMIexec.
The third tool – ntdsutil.exe – is used to back up the Active Directory database, from which credentials could be harvested. Most ransomware operators tend to use a consistent approach for every victim unless a security configuration forces a change of plan. However, in the case of Prestige, the method used varied from target to target.
In two methods of infection, the ransomware payload is copied to the ADMIN$ share of a remote system. Then in one, Impacket creates a Windows Scheduled Task on the victim's system to execute the payload. In the other method, Impacket is used to remotely invoke an encoded PowerShell command on the system to launch the payload.
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