Uncommon Child Process Of BgInfo.EXE

Hunt Hypothesis

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

Detection Rule

Sigma (Original)

title: Uncommon Child Process Of BgInfo.EXE
id: aaf46cdc-934e-4284-b329-34aa701e3771
related:
    - id: 811f459f-9231-45d4-959a-0266c6311987
      type: similar
status: test
description: Detects uncommon child processes of "BgInfo.exe" which could be a sign of potential abuse of the binary to proxy execution via external VBScript
references:
    - https://lolbas-project.github.io/lolbas/OtherMSBinaries/Bginfo/
    - https://oddvar.moe/2017/05/18/bypassing-application-whitelisting-with-bginfo/
author: Nasreddine Bencherchali (Nextron Systems), Beyu Denis, oscd.community
date: 2019-10-26
modified: 2023-08-16
tags:
    - attack.execution
    - attack.stealth
    - attack.t1059.005
    - attack.t1218
    - attack.t1202
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith:
            - '\bginfo.exe'
            - '\bginfo64.exe'
    condition: selection
falsepositives:
    - Unknown
level: medium

KQL (Azure Sentinel)

imProcessCreate
| where (ParentProcessName endswith "\\bginfo.exe" or ParentProcessName endswith "\\bginfo64.exe") or (ActingProcessName endswith "\\bginfo.exe" or ActingProcessName endswith "\\bginfo64.exe")

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Tactic: Execution
• Technique: T1059.005 — T1059.005
• Technique: T1218 — T1218
• Technique: T1202 — T1202

References

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