PUA - Wsudo Suspicious Execution — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-12-02 / 2023-02-14.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 3d2b9d79823e1ef2a60bd92f1eac2545208980f5d2945624c9c43d7d4d0c8b3d

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: PUA - Wsudo Suspicious Execution
id: bdeeabc9-ff2a-4a51-be59-bb253aac7891
status: test
description: Detects usage of wsudo (Windows Sudo Utility). Which is a tool that let the user execute programs with different permissions (System, Trusted Installer, Administrator...etc)
references:
    - https://github.com/M2Team/Privexec/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-12-02
modified: 2023-02-14
tags:
    - attack.execution
    - attack.privilege-escalation
    - attack.t1059
logsource:
    category: process_creation
    product: windows
detection:
    selection_metadata:
        - Image|endswith: '\wsudo.exe'
        - OriginalFileName: 'wsudo.exe'
        - Description: 'Windows sudo utility'
        - ParentImage|endswith: '\wsudo-bridge.exe'
    selection_cli:
        CommandLine|contains:
            - '-u System'
            - '-uSystem'
            - '-u TrustedInstaller'
            - '-uTrustedInstaller'
            - ' --ti '
    condition: 1 of selection_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/M2Team/Privexec/