Stop Windows Service Via Net.EXE

Status: test
Severity: low
Log source: category process_creation, product windows
Author: Jakob Weinzettl, oscd.community, Nasreddine Bencherchali (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects the stopping of a Windows service via the "net" utility.

Known false positives

There are many legitimate reasons to stop a service. This rule isn't looking for any suspicious behaviour in particular. Filter legitimate activity accordingly

MITRE ATT&CK coverage

Tactic	Techniques
Impact	`T1489` Service Stop

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

title: Stop Windows Service Via Net.EXE
id: 88872991-7445-4a22-90b2-a3adadb0e827
related:
    - id: eb87818d-db5d-49cc-a987-d5da331fbd90
      type: obsolete
status: test
description: Detects the stopping of a Windows service via the "net" utility.
references:
    - https://ss64.com/nt/net-service.html
author: Jakob Weinzettl, oscd.community, Nasreddine Bencherchali (Nextron Systems)
date: 2023-03-05
tags:
    - attack.impact
    - attack.t1489
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - OriginalFileName:
              - 'net.exe'
              - 'net1.exe'
        - Image|endswith:
              - '\net.exe'
              - '\net1.exe'
    selection_cli:
        CommandLine|contains: ' stop '
    condition: all of selection_*
falsepositives:
    - There are many legitimate reasons to stop a service. This rule isn't looking for any suspicious behaviour in particular. Filter legitimate activity accordingly
level: low

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_img`

selection_img:
    - OriginalFileName:
          - 'net.exe'
          - 'net1.exe'
    - Image|endswith:
          - '\net.exe'
          - '\net1.exe'

Stage 2: `selection_cli`

selection_cli:
    CommandLine|contains: ' stop '

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`stop` corpus 8 (sigma 6, splunk 2)	`field:"CommandLine" kind:match value:" stop "`
`Image`	ends_with	`\net.exe` corpus 49 (sigma 49) `\net1.exe` corpus 47 (sigma 47)	`field:"Image" kind:ends_with`
`OriginalFileName`	eq	`net.exe` corpus 31 (sigma 19, elastic 10, splunk 2) `net1.exe` corpus 44 (sigma 19, splunk 19, elastic 6)	`field:"OriginalFileName" kind:eq`

Stop Windows Service Via Net.EXE

Known false positives

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection_img

Stage 2: selection_cli

Indicators

Stage 0: `condition`

Stage 1: `selection_img`

Stage 2: `selection_cli`