Suspicious Extrac32 Execution — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: medium. Source dates: 2021-11-26 / 2022-08-13.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 69cd634d03dc84a034e03db96c12facc6cb847835cd90253006b1aa229864893

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Suspicious Extrac32 Execution
id: aa8e035d-7be4-48d3-a944-102aec04400d
status: test
description: Download or Copy file with Extrac32
references:
    - https://lolbas-project.github.io/lolbas/Binaries/Extrac32/
author: frack113
date: 2021-11-26
modified: 2022-08-13
tags:
    - attack.command-and-control
    - attack.t1105
logsource:
    category: process_creation
    product: windows
detection:
    selection_lolbas:
        - CommandLine|contains: extrac32.exe
        - Image|endswith: '\extrac32.exe'
        - OriginalFileName: 'extrac32.exe'
    selection_archive:
        CommandLine|contains: '.cab'
    selection_options:
        CommandLine|contains:
            - /C
            - /Y
            - ' \\\\'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://lolbas-project.github.io/lolbas/Binaries/Extrac32/