CobaltStrike Service Installations - System — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems), Wojciech Lesicki. Source status: test; severity: critical. Source dates: 2021-05-26 / 2022-11-27.

{
  "product": "windows",
  "service": "system"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 72c28ec5eb960dea4598cc421487121b84b42b8a6a4842b94daa4f897b26624a

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: CobaltStrike Service Installations - System
id: 5a105d34-05fc-401e-8553-272b45c1522d
status: test
description: Detects known malicious service installs that appear in cases in which a Cobalt Strike beacon elevates privileges or lateral movement
references:
    - https://www.sans.org/webcasts/119395
    - https://www.crowdstrike.com/blog/getting-the-bacon-from-cobalt-strike-beacon/
    - https://thedfirreport.com/2021/08/29/cobalt-strike-a-defenders-guide/
author: Florian Roth (Nextron Systems), Wojciech Lesicki
date: 2021-05-26
modified: 2022-11-27
tags:
    - attack.persistence
    - attack.execution
    - attack.privilege-escalation
    - attack.lateral-movement
    - attack.t1021.002
    - attack.t1543.003
    - attack.t1569.002
logsource:
    product: windows
    service: system
detection:
    selection_id:
        Provider_Name: 'Service Control Manager'
        EventID: 7045
    selection1:
        ImagePath|contains|all:
            - 'ADMIN$'
            - '.exe'
    selection2:
        ImagePath|contains|all:
            - '%COMSPEC%'
            - 'start'
            - 'powershell'
    selection3:
        ImagePath|contains: 'powershell -nop -w hidden -encodedcommand'
    selection4:
        ImagePath|base64offset|contains: "IEX (New-Object Net.Webclient).DownloadString('http://127.0.0.1:"
    condition: selection_id and (selection1 or selection2 or selection3 or selection4)
falsepositives:
    - Unknown
level: critical

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.sans.org/webcasts/119395
• https://www.crowdstrike.com/blog/getting-the-bacon-from-cobalt-strike-beacon/
• https://thedfirreport.com/2021/08/29/cobalt-strike-a-defenders-guide/