Sigma rule: Suspicious WmiPrvSE Child Process

Rule

Title

Suspicious WmiPrvSE Child Process

Status

test

Level

high

Author

Vadim Khrykov (ThreatIntel), Cyb3rEng, Florian Roth (Nextron Systems)

Date

2021-08-23

Modified

2023-11-10

File

rules/windows/process_creation/proc_creation_win_wmiprvse_susp_child_processes.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious and uncommon child processes of WmiPrvSE

Log source

product

windows

category

process_creation

Detection

selection_parent:
    ParentImage|endswith: '\wbem\WmiPrvSE.exe'
selection_children_1:
    # TODO: Add more LOLBINs or suspicious processes that make sens in your environment
    Image|endswith:
        - '\certutil.exe'
        - '\cscript.exe'
        - '\mshta.exe'
        - '\msiexec.exe'
        - '\regsvr32.exe'
        - '\rundll32.exe'
        - '\verclsid.exe'
        - '\wscript.exe'
selection_children_2:
    # This is in a separate selection due to the nature of FP generated with CMD
    Image|endswith: '\cmd.exe'
    CommandLine|contains:
        - 'cscript'
        - 'mshta'
        - 'powershell'
        - 'pwsh'
        - 'regsvr32'
        - 'rundll32'
        - 'wscript'
filter_main_werfault:
    Image|endswith: '\WerFault.exe'
filter_main_wmiprvse:
    Image|endswith: '\WmiPrvSE.exe' # In some legitimate case WmiPrvSE was seen spawning itself
filter_main_msiexec:
    Image|endswith: '\msiexec.exe'
    CommandLine|contains: '/i '
condition: selection_parent and 1 of selection_children_* and not 1 of filter_main_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.execution
• attack.stealth
• attack.t1047
• attack.t1204.002
• attack.t1218.010

MITRE ATT&CK ids this rule names

• T1047
• T1204.002
• T1218.010

Related rules

• 692f0bec-83ba-4d04-af7e-e884a96059b6 (similar)
• d21374ff-f574-44a7-9998-4a8c8bf33d7d (similar)
• 18cf6cf0-39b0-4c22-9593-e244bdc9a2d4 (obsolete)

References

• https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
• https://github.com/vadim-hunter/Detection-Ideas-Rules/blob/02bcbfc2bfb8b4da601bb30de0344ae453aa1afe/Threat%20Intelligence/The%20DFIR%20Report/20210329_Sodinokibi_(aka_REvil)_Ransomware.yaml
• https://blog.osarmor.com/319/onenote-attachment-delivers-asyncrat-malware/
• https://twitter.com/ForensicITGuy/status/1334734244120309760

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_wmiprvse_susp_child_processes.yml