RedMimicry Winnti Playbook Registry Manipulation

Hunt Hypothesis

Detects actions caused by the RedMimicry Winnti playbook

Detection Rule

Sigma (Original)

title: RedMimicry Winnti Playbook Registry Manipulation
id: 5b175490-b652-4b02-b1de-5b5b4083c5f8
status: test
description: Detects actions caused by the RedMimicry Winnti playbook
references:
    - https://redmimicry.com
author: Alexander Rausch
date: 2020-06-24
modified: 2021-11-27
tags:
    - attack.persistence
    - attack.defense-impairment
    - attack.t1112
logsource:
    product: windows
    category: registry_event
detection:
    selection:
        TargetObject|contains: HKLM\SOFTWARE\Microsoft\HTMLHelp\data
    condition: selection
falsepositives:
    - Unknown
level: high

KQL (Azure Sentinel)

imRegistry
| where RegistryKey contains "HKLM\\SOFTWARE\\Microsoft\\HTMLHelp\\data"

KQL (Microsoft 365 Defender)

DeviceRegistryEvents
| where RegistryKey contains "HKLM\\SOFTWARE\\Microsoft\\HTMLHelp\\data"

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Tactic: Persistence
• Technique: T1112 — T1112

References

• https://redmimicry.com
• SigmaHQ Rule