Emerging Threatcriticaltest

REvil Kaseya Incident Malware Patterns

Detects process command line patterns and locations used by REvil group in Kaseya incident (can also match on other malware)

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Launch

Florian Roth (Nextron Systems)Created Sat Jul 03Updated Fri May 205de632bc-7fbd-4c8a-944a-fce55c59eae52021

Emerging Threat

Active Threat

Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.

Log Source

WindowsProcess Creation

ProductWindows← raw: windows

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

detection:
    selection1:
        CommandLine|contains:
            - 'C:\Windows\cert.exe'
            - 'del /q /f c:\kworking\agent.crt'
            - 'Kaseya VSA Agent Hot-fix'
            - '\AppData\Local\Temp\MsMpEng.exe'
            - 'rmdir /s /q %SystemDrive%\inetpub\logs'
            - 'del /s /q /f %SystemDrive%\\*.log'
            - 'c:\kworking1\agent.exe'
            - 'c:\kworking1\agent.crt'
    selection2:
        Image:
            - 'C:\Windows\MsMpEng.exe'
            - 'C:\Windows\cert.exe'
            - 'C:\kworking\agent.exe'
            - 'C:\kworking1\agent.exe'
    selection3:
        CommandLine|contains|all:
            - 'del /s /q /f'
            - 'WebPages\Errors\webErrorLog.txt'
    condition: 1 of selection*