Sigma rule: Suspicious Child Process Of Wermgr.EXE

Rule

Title

Suspicious Child Process Of Wermgr.EXE

Status

test

Level

high

Author

Florian Roth (Nextron Systems)

Date

2022-10-14

Modified

2024-08-29

File

rules/windows/process_creation/proc_creation_win_wermgr_susp_child_process.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious Windows Error Reporting manager (wermgr.exe) child process

Log source

product

windows

category

process_creation

Detection

selection:
    ParentImage|endswith: '\wermgr.exe'
    Image|endswith:
        - '\cmd.exe'
        - '\cscript.exe'
        - '\ipconfig.exe'
        - '\mshta.exe'
        - '\net.exe'
        - '\net1.exe'
        - '\netstat.exe'
        - '\nslookup.exe'
        - '\powershell_ise.exe'
        - '\powershell.exe'
        - '\pwsh.exe'
        - '\regsvr32.exe'
        - '\rundll32.exe'
        - '\systeminfo.exe'
        - '\whoami.exe'
        - '\wscript.exe'
filter_main_rundll32:
    Image|endswith: '\rundll32.exe'
    CommandLine|contains|all:
        - 'C:\Windows\system32\WerConCpl.dll'
        - 'LaunchErcApp '
    CommandLine|contains:
        - '-queuereporting'
        - '-responsepester'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.privilege-escalation
• attack.stealth
• attack.t1055
• attack.t1036

MITRE ATT&CK ids this rule names

• T1036
• T1055

Related rules

• 5394fcc7-aeb2-43b5-9a09-cac9fc5edcd5 (similar)

References

• https://www.trendmicro.com/en_us/research/22/j/black-basta-infiltrates-networks-via-qakbot-brute-ratel-and-coba.html
• https://www.echotrail.io/insights/search/wermgr.exe
• https://github.com/binderlabs/DirCreate2System

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_wermgr_susp_child_process.yml