HackTool - RedMimicry Winnti Playbook Execution

Hunt Hypothesis

Detects actions caused by the RedMimicry Winnti playbook a automated breach emulations utility

Detection Rule

Sigma (Original)

title: HackTool - RedMimicry Winnti Playbook Execution
id: 95022b85-ff2a-49fa-939a-d7b8f56eeb9b
status: test
description: Detects actions caused by the RedMimicry Winnti playbook a automated breach emulations utility
references:
    - https://redmimicry.com/posts/redmimicry-winnti/
author: Alexander Rausch
date: 2020-06-24
modified: 2023-03-01
tags:
    - attack.execution
    - attack.stealth
    - attack.t1106
    - attack.t1059.003
    - attack.t1218.011
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        Image|endswith:
            - '\rundll32.exe'
            - '\cmd.exe'
        CommandLine|contains:
            - 'gthread-3.6.dll'
            - '\Windows\Temp\tmp.bat'
            - 'sigcmm-2.4.dll'
    condition: selection
falsepositives:
    - Unknown
level: high

KQL (Azure Sentinel)

imProcessCreate
| where (TargetProcessName endswith "\\rundll32.exe" or TargetProcessName endswith "\\cmd.exe") and (TargetProcessCommandLine contains "gthread-3.6.dll" or TargetProcessCommandLine contains "\\Windows\\Temp\\tmp.bat" or TargetProcessCommandLine contains "sigcmm-2.4.dll")

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Tactic: Execution
• Technique: T1106 — T1106
• Technique: T1059.003 — T1059.003
• Technique: T1218.011 — T1218.011

References

• https://redmimicry.com/posts/redmimicry-winnti/
• SigmaHQ Rule