PSExec and WMI Process Creations Block — Sigma Rule

Rule metadata and linked tags

Author: Bhabesh Raj. Source status: test; severity: high. Source dates: 2020-07-14 / 2022-12-25.

{
  "product": "windows",
  "service": "windefend",
  "definition": "Requirements:Enabled Block process creations originating from PSExec and WMI commands from Attack Surface Reduction (GUID: d1e49aac-8f56-4280-b9ba-993a6d77406c)"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 628c32035d2bd274ec33656e88d0d04b6faf7405b44239f8580f0449d7bd4590

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: PSExec and WMI Process Creations Block
id: 97b9ce1e-c5ab-11ea-87d0-0242ac130003
status: test
description: Detects blocking of process creations originating from PSExec and WMI commands
references:
    - https://learn.microsoft.com/en-us/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-process-creations-originating-from-psexec-and-wmi-commands
    - https://twitter.com/duff22b/status/1280166329660497920
author: Bhabesh Raj
date: 2020-07-14
modified: 2022-12-25
tags:
    - attack.execution
    - attack.lateral-movement
    - attack.t1047
    - attack.t1569.002
logsource:
    product: windows
    service: windefend
    definition: 'Requirements:Enabled Block process creations originating from PSExec and WMI commands from Attack Surface Reduction (GUID: d1e49aac-8f56-4280-b9ba-993a6d77406c)'
detection:
    selection:
        EventID: 1121
        ProcessName|endswith:
            - '\wmiprvse.exe'
            - '\psexesvc.exe'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://learn.microsoft.com/en-us/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-process-creations-originating-from-psexec-and-wmi-commands
• https://twitter.com/duff22b/status/1280166329660497920