HackTool - SharpWSUS/WSUSpendu Execution — Sigma Rule

Rule metadata and linked tags

Author: @Kostastsale, Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-10-07 / 2024-08-23.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: ac6432a60c71aed4dc2633f0694a5175f1dbdd41051bc53ea87b258e9583f0d8

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: HackTool - SharpWSUS/WSUSpendu Execution
id: b0ce780f-10bd-496d-9067-066d23dc3aa5
status: test
description: |
    Detects the execution of SharpWSUS or WSUSpendu, utilities that allow for lateral movement through WSUS.
    Windows Server Update Services (WSUS) is a critical component of Windows systems and is frequently configured in a way that allows an attacker to circumvent internal networking limitations.
references:
    - https://labs.nettitude.com/blog/introducing-sharpwsus/
    - https://github.com/nettitude/SharpWSUS
    - https://web.archive.org/web/20210512154016/https://github.com/AlsidOfficial/WSUSpendu/blob/master/WSUSpendu.ps1
author: '@Kostastsale, Nasreddine Bencherchali (Nextron Systems)'
date: 2022-10-07
modified: 2024-08-23
tags:
    - attack.execution
    - attack.lateral-movement
    - attack.t1210
logsource:
    product: windows
    category: process_creation
detection:
    selection_wsuspendu_inject:
        CommandLine|contains: ' -Inject '
    selection_wsuspendu_payload:
        CommandLine|contains:
            - ' -PayloadArgs '
            - ' -PayloadFile '
    selection_sharpwsus_commands:
        CommandLine|contains:
            - ' approve '
            - ' create '
            - ' check '
            - ' delete '
    selection_sharpwsus_flags:
        CommandLine|contains:
            - ' /payload:'
            - ' /payload='
            - ' /updateid:'
            - ' /updateid='
    condition: all of selection_wsuspendu_* or all of selection_sharpwsus_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://labs.nettitude.com/blog/introducing-sharpwsus/
• https://github.com/nettitude/SharpWSUS
• https://web.archive.org/web/20210512154016/https://github.com/AlsidOfficial/WSUSpendu/blob/master/WSUSpendu.ps1