Execute Pcwrun.EXE To Leverage Follina

Hunt Hypothesis

Detects indirect command execution via Program Compatibility Assistant “pcwrun.exe” leveraging the follina (CVE-2022-30190) vulnerability

Detection Rule

Sigma (Original)

title: Execute Pcwrun.EXE To Leverage Follina
id: 6004abd0-afa4-4557-ba90-49d172e0a299
status: test
description: Detects indirect command execution via Program Compatibility Assistant "pcwrun.exe" leveraging the follina (CVE-2022-30190) vulnerability
references:
    - https://twitter.com/nas_bench/status/1535663791362519040
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-06-13
tags:
    - attack.stealth
    - attack.t1218
    - attack.execution
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\pcwrun.exe'
        CommandLine|contains: '../'
    condition: selection
falsepositives:
    - Unlikely
level: high

KQL (Azure Sentinel)

imProcessCreate
| where TargetProcessName endswith "\\pcwrun.exe" and TargetProcessCommandLine contains "../"

Required Data Sources

False Positive Guidance

• Unlikely

MITRE ATT&CK Context

• Tactic: Execution
• Technique: T1218 — T1218

References

• https://twitter.com/nas_bench/status/1535663791362519040
• SigmaHQ Rule