smbexec.py Service Installation — Sigma Rule

Rule metadata and linked tags

Author: Omer Faruk Celik. Source status: test; severity: high. Source dates: 2018-03-20 / 2023-11-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 38f1b0758327c40523569062e0621acaded6f9184a56828a3c9bdd45d2091175

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: smbexec.py Service Installation
id: 52a85084-6989-40c3-8f32-091e12e13f09
status: test
description: Detects the use of smbexec.py tool by detecting a specific service installation
references:
    - https://blog.ropnop.com/using-credentials-to-own-windows-boxes-part-2-psexec-and-services/
    - https://github.com/fortra/impacket/blob/33058eb2fde6976ea62e04bc7d6b629d64d44712/examples/smbexec.py#L286-L296
    - https://github.com/fortra/impacket/blob/edef71f17bc1240f9f8c957bbda98662951ac3ec/examples/smbexec.py#L60 # Old service name
author: Omer Faruk Celik
date: 2018-03-20
modified: 2023-11-09
tags:
    - attack.lateral-movement
    - attack.execution
    - attack.t1021.002
    - attack.t1569.002
logsource:
    product: windows
    service: system
detection:
    selection_eid:
        Provider_Name: 'Service Control Manager'
        EventID: 7045
    selection_service_name:
        ServiceName: 'BTOBTO'
    selection_service_image:
        ImagePath|contains:
            - '.bat & del '
            - '__output 2^>^&1 >'
    condition: selection_eid and 1 of selection_service_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://blog.ropnop.com/using-credentials-to-own-windows-boxes-part-2-psexec-and-services/
• https://github.com/fortra/impacket/blob/33058eb2fde6976ea62e04bc7d6b629d64d44712/examples/smbexec.py#L286-L296
• https://github.com/fortra/impacket/blob/edef71f17bc1240f9f8c957bbda98662951ac3ec/examples/smbexec.py#L60