Suspicious Key Manager Access — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2022-04-21 / 2023-02-09.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: b7518924dc0eedb257c1917aa947c4930239b6297b87463739b76aff710296ec

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Suspicious Key Manager Access
id: a4694263-59a8-4608-a3a0-6f8d3a51664c
status: test
description: Detects the invocation of the Stored User Names and Passwords dialogue (Key Manager)
references:
    - https://twitter.com/NinjaParanoid/status/1516442028963659777
author: Florian Roth (Nextron Systems)
date: 2022-04-21
modified: 2023-02-09
tags:
    - attack.credential-access
    - attack.t1555.004
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\rundll32.exe'
        - OriginalFileName: 'RUNDLL32.EXE'
    selection_cli:
        CommandLine|contains|all:
            - 'keymgr'
            - 'KRShowKeyMgr'
    condition: all of selection_*
falsepositives:
    - Administrative activity
level: high

Original YAML and metadata in JSON

False positives

• Administrative activity

Source references

• https://twitter.com/NinjaParanoid/status/1516442028963659777