Folder Compress To Potentially Suspicious Output Via Compress-Archive Cmdlet — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems), frack113. Source status: test; severity: medium. Source dates: 2021-07-20 / 2022-10-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 6facf8920c522e7dd39ca11de31ac9c333eb9326d28a7b1dcba69fe2c8d7357c

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: Folder Compress To Potentially Suspicious Output Via Compress-Archive Cmdlet
id: 85a8e5ba-bd03-4bfb-bbfa-a4409a8f8b98 # Process Creation
related:
    - id: 71ff406e-b633-4989-96ec-bc49d825a412 # PowerShell Classic
      type: similar
    - id: daf7eb81-35fd-410d-9d7a-657837e602bb # PowerShell Module
      type: similar
    - id: b7a3c9a3-09ea-4934-8864-6a32cacd98d9 # PowerShell Script
      type: similar
status: test
description: |
    Detects PowerShell scripts that make use of the "Compress-Archive" Cmdlet in order to compress folders and files where the output is stored in a potentially suspicious location that is used often by malware for exfiltration.
    An adversary might compress data (e.g., sensitive documents) that is collected prior to exfiltration in order to make it portable and minimize the amount of data sent over the network.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1074.001/T1074.001.md
    - https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-347a
author: Nasreddine Bencherchali (Nextron Systems), frack113
date: 2021-07-20
modified: 2022-10-09
tags:
    - attack.collection
    - attack.t1074.001
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        CommandLine|contains:
            - 'Compress-Archive -Path*-DestinationPath $env:TEMP'
            - 'Compress-Archive -Path*-DestinationPath*\AppData\Local\Temp\'
            - 'Compress-Archive -Path*-DestinationPath*:\Windows\Temp\'
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1074.001/T1074.001.md
• https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-347a