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Detection rules › Sigma

Compress-Archive Cmdlet Execution

Status
test
Severity
low
Log source
product windows, category ps_script
Author
Timur Zinniatullin, oscd.community
Source
github.com/SigmaHQ/sigma

Detects PowerShell scripts that make use of the "Compress-Archive" cmdlet in order to compress folders and files. 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.

MITRE ATT&CK coverage

TacticTechniques
CollectionT1560 Archive Collected Data

Event coverage

ProviderEventTitle
PowerShellEvent ID 4104Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body yaml

title: Compress-Archive Cmdlet Execution
id: 6dc5d284-69ea-42cf-9311-fb1c3932a69a
status: test
description: |
    Detects PowerShell scripts that make use of the "Compress-Archive" cmdlet in order to compress folders and files.
    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/T1560/T1560.md
author: Timur Zinniatullin, oscd.community
date: 2019-10-21
modified: 2023-12-15
tags:
    - attack.exfiltration
    - attack.collection
    - attack.t1560
    - detection.threat-hunting
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains: 'Compress-Archive'
    condition: selection
falsepositives:
    - Likely
level: low

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|contains: 'Compress-Archive'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
ScriptBlockTextmatch
  • Compress-Archive corpus 2 (sigma 1, splunk 1)