Lolbin Runexehelper Use As Proxy

Hunt Hypothesis

Detect usage of the “runexehelper.exe” binary as a proxy to launch other programs

Detection Rule

Sigma (Original)

title: Lolbin Runexehelper Use As Proxy
id: cd71385d-fd9b-4691-9b98-2b1f7e508714
status: test
description: Detect usage of the "runexehelper.exe" binary as a proxy to launch other programs
references:
    - https://twitter.com/0gtweet/status/1206692239839289344
    - https://lolbas-project.github.io/lolbas/Binaries/Runexehelper/
author: frack113
date: 2022-12-29
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\runexehelper.exe'
    condition: selection
falsepositives:
    - Unknown
level: medium

KQL (Azure Sentinel)

imProcessCreate
| where ParentProcessName endswith "\\runexehelper.exe" or ActingProcessName endswith "\\runexehelper.exe"

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Technique: T1218 — T1218

References

• https://twitter.com/0gtweet/status/1206692239839289344
• https://lolbas-project.github.io/lolbas/Binaries/Runexehelper/
• SigmaHQ Rule