Suspicious GrpConv Execution

calendar Oct 23, 2025 · attack.privilege-escalation attack.persistence attack.t1547  ·
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Detects the suspicious execution of a utility to convert Windows 3.x .grp files or for persistence purposes by malicious software or actors

Sigma rule (View on GitHub)

 1title: Suspicious GrpConv Execution
 2id: f14e169e-9978-4c69-acb3-1cff8200bc36
 3status: test
 4description: Detects the suspicious execution of a utility to convert Windows 3.x .grp files or for persistence purposes by malicious software or actors
 5references:
 6    - https://twitter.com/0gtweet/status/1526833181831200770
 7author: Florian Roth (Nextron Systems)
 8date: 2022-05-19
 9tags:
10    - attack.privilege-escalation
11    - attack.persistence
12    - attack.t1547
13logsource:
14    category: process_creation
15    product: windows
16detection:
17    selection:
18        CommandLine|contains:
19            - 'grpconv.exe -o'
20            - 'grpconv -o'
21    condition: selection
22falsepositives:
23    - Unknown
24level: high

References

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