Sigma rule: Suspicious Child Process Of BgInfo.EXE

Rule

Title

Suspicious Child Process Of BgInfo.EXE

Status

test

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2023-08-16

File

rules/windows/process_creation/proc_creation_win_bginfo_suspicious_child_process.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious child processes of "BgInfo.exe" which could be a sign of potential abuse of the binary to proxy execution via external VBScript

Log source

product

windows

category

process_creation

Detection

selection_parent:
    ParentImage|endswith:
        - '\bginfo.exe'
        - '\bginfo64.exe'
selection_child:
    - Image|endswith:
          - '\calc.exe'
          - '\cmd.exe'
          - '\cscript.exe'
          - '\mshta.exe'
          - '\notepad.exe'
          - '\powershell.exe'
          - '\pwsh.exe'
          - '\wscript.exe'
    - Image|contains:
          - '\AppData\Local\'
          - '\AppData\Roaming\'
          - ':\Users\Public\'
          - ':\Temp\'
          - ':\Windows\Temp\'
          - ':\PerfLogs\'
condition: all of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.execution
• attack.stealth
• attack.t1059.005
• attack.t1218
• attack.t1202

MITRE ATT&CK ids this rule names

• T1059.005
• T1202
• T1218

Related rules

• aaf46cdc-934e-4284-b329-34aa701e3771 (similar)

References

• https://lolbas-project.github.io/lolbas/OtherMSBinaries/Bginfo/
• https://oddvar.moe/2017/05/18/bypassing-application-whitelisting-with-bginfo/

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_bginfo_suspicious_child_process.yml