SigmaHQ/rules/windows/process_creation/win_susp_rar_flags.yml

title: Rar with Password or Compression Level 
id: faa48cae-6b25-4f00-a094-08947fef582f
status: experimental
description: Detects the use of rar.exe, on the command line, to create an archive with password protection or with a specific compression level. This is pretty indicative of malicious actions. 
references:
    - https://labs.sentinelone.com/the-anatomy-of-an-apt-attack-and-cobaltstrike-beacons-encoded-configuration/
author: '@ROxPinTeddy'
date: 2020/05/12
modified: 2020/08/28
tags:
    - attack.collection
    - attack.t1560.001
    - attack.exfiltration # an old one  
    - attack.t1002        # an old one  

logsource:
    category: process_creation
    product: windows
detection:
    selection:
       CommandLine|contains|all:
               - ' -hp'
               - ' -m'
    condition: selection
falsepositives:
    - Legitimate use of Winrar command line version
    - Other command line tools, that use these flags
level: medium