Files Added To An Archive Using Rar.EXE

Title: Files Added To An Archive Using Rar.EXE
Status: test
Description:Detects usage of "rar" to add files to an archive for potential compression. An adversary may 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/T1560.001/T1560.001.md
  -https://eqllib.readthedocs.io/en/latest/analytics/1ec33c93-3d0b-4a28-8014-dbdaae5c60ae.html
Author: Timur Zinniatullin, E.M. Anhaus, oscd.community
Date: 2019-10-21
modified:2023-02-05
Tags:

• -'attack.collection'
• -'attack.t1560.001'

Logsource:

• category: process_creation
• product: windows

Detection:
  selection:
    Image|endswith: '\rar.exe'
    CommandLine|contains: ' a '
  condition:selection
Falsepositives:
  -Highly likely if rar is a default archiver in the monitored environment.
Level: low