Detectionhightest

Suspicious Processes Spawned by WinRM

Detects suspicious processes including shells spawnd from WinRM host process

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

Andreas Hunkeler, Markus NeisCreated Thu May 20Updated Thu Jul 145cc2cda8-f261-4d88-a2de-e9e193c86716windows

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:
    selection:
        ParentImage|endswith: '\wsmprovhost.exe'
        Image|endswith:
            - '\cmd.exe'
            - '\sh.exe'
            - '\bash.exe'
            - '\powershell.exe'
            - '\pwsh.exe'
            - '\wsl.exe'
            - '\schtasks.exe'
            - '\certutil.exe'
            - '\whoami.exe'
            - '\bitsadmin.exe'
    condition: selection

False Positives

Legitimate WinRM usage

References

Resolving title…

Internal Research

MITRE ATT&CK

Tactics

TA0001 · Initial Access TA0003 · Persistence TA0004 · Privilege Escalation

Techniques

T1190 · Exploit Public-Facing Application

Rule Metadata

Rule ID

5cc2cda8-f261-4d88-a2de-e9e193c86716

Status

test

Level

high

Type

Detection

Created

Thu May 20

Modified

Thu Jul 14

Author

Andreas Hunkeler, Markus Neis

Path

rules/windows/process_creation/proc_creation_win_winrm_susp_child_process.yml

Raw Tags

attack.t1190attack.initial-accessattack.persistenceattack.privilege-escalation

View on GitHub