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smbexec.py Service Installation

Status
test
Severity
high
Log source
product windows, service system
Author
Omer Faruk Celik
Source
github.com/SigmaHQ/sigma

Detects the use of smbexec.py tool by detecting a specific service installation

MITRE ATT&CK coverage

TacticTechniques
Execution
Lateral Movement

Telemetry coverage

ProviderRecord / event type
Service-Control-ManagerEvent ID 7045: A service was installed in the system.

Rule body

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

Stages and Predicates

Stage 0: condition

selection_eid and 1 of selection_service_*

Stage 1: selection_eid

selection_eid:
    Provider_Name: 'Service Control Manager'
    EventID: 7045

Stage 2: selection_service_name

selection_service_name:
    ServiceName: 'BTOBTO'

Stage 3: selection_service_image

selection_service_image:
    ImagePath|contains:
        - '.bat & del '
        - '__output 2^>^&1 >'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
ImagePathmatch
  • .bat & del
  • __output 2^>^&1 >
field:"ImagePath" kind:match
Provider_Nameeq
  • Service Control Manager corpus 50 (sigma 50)
field:"Provider_Name" kind:eq value:"Service Control Manager"
ServiceNameeq
  • BTOBTO corpus 2 (sigma 2)
field:"ServiceName" kind:eq value:"BTOBTO"