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Detection rules › Sigma

Indirect Command Execution By Program Compatibility Wizard

Status
test
Severity
low
Log source
category process_creation, product windows
Author
A. Sungurov , oscd.community
Source
github.com/SigmaHQ/sigma

Detect indirect command execution via Program Compatibility Assistant pcwrun.exe

Known false positives

  • Need to use extra processing with 'unique_count' / 'filter' to focus on outliers as opposed to commonly seen artifacts
  • Legit usage of scripts

MITRE ATT&CK coverage

TacticTechniques
Stealth

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 1: Process creation
Security-AuditingEvent ID 4688: A new process has been created.

Rule body

title: Indirect Command Execution By Program Compatibility Wizard
id: b97cd4b1-30b8-4a9d-bd72-6293928d52bc
status: test
description: Detect indirect command execution via Program Compatibility Assistant pcwrun.exe
references:
    - https://twitter.com/pabraeken/status/991335019833708544
    - https://lolbas-project.github.io/lolbas/Binaries/Pcwrun/
author: A. Sungurov , oscd.community
date: 2020-10-12
modified: 2021-11-27
tags:
    - attack.stealth
    - attack.t1218
    - attack.execution
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\pcwrun.exe'
    condition: selection
falsepositives:
    - Need to use extra processing with 'unique_count' / 'filter' to focus on outliers as opposed to commonly seen artifacts
    - Legit usage of scripts
level: low

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ParentImage|endswith: '\pcwrun.exe'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
ParentImageends_with
  • \pcwrun.exe
field:"ParentImage" kind:ends_with value:"\pcwrun.exe"