Suspicious GrpConv Execution

Title: Suspicious GrpConv Execution
Status: test
Description:Detects the suspicious execution of a utility to convert Windows 3.x .grp files or for persistence purposes by malicious software or actors
References:
  -https://twitter.com/0gtweet/status/1526833181831200770
Author: Florian Roth (Nextron Systems)
Date: 2022-05-19
modified:None
Tags:

• -'attack.privilege-escalation'
• -'attack.persistence'
• -'attack.t1547'

Logsource:

• category: process_creation
• product: windows

Detection:
  selection:
    CommandLine|contains:
      -'grpconv.exe -o'
      -'grpconv -o'

  condition:selection
Falsepositives:
  -Unknown
Level: high