Sigma rule: Potentially Suspicious Child Process Of WinRAR.EXE

Rule

Title

Potentially Suspicious Child Process Of WinRAR.EXE

Status

test

Level

medium

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2023-08-31

File

rules/windows/process_creation/proc_creation_win_winrar_susp_child_process.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potentially suspicious child processes of WinRAR.exe.

Log source

product

windows

category

process_creation

Detection

selection_parent:
    ParentImage|endswith: '\WinRAR.exe'
selection_binaries:
    # Note: add additional binaries that the attacker might use
    - Image|endswith:
          - '\cmd.exe'
          - '\cscript.exe'
          - '\mshta.exe'
          - '\powershell.exe'
          - '\pwsh.exe'
          - '\regsvr32.exe'
          - '\rundll32.exe'
          - '\wscript.exe'
    - OriginalFileName:
          - 'Cmd.Exe'
          - 'cscript.exe'
          - 'mshta.exe'
          - 'PowerShell.EXE'
          - 'pwsh.dll'
          - 'regsvr32.exe'
          - 'RUNDLL32.EXE'
          - 'wscript.exe'
condition: all of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.execution
• attack.t1203

MITRE ATT&CK ids this rule names

• T1203

Related rules

• ec3a3c2f-9bb0-4a9b-8f4b-5ec386544343 (similar)

References

• https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/
• https://github.com/knight0x07/WinRAR-Code-Execution-Vulnerability-CVE-2023-38831/blob/26ab6c40b6d2c09bb4fc60feaa4a3a90cfd20c23/Part-1-Overview.md

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_winrar_susp_child_process.yml