Service Installation in Suspicious Folder

Status: test
Severity: medium
Log source: product windows, service system
Author: pH-T (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects service installation in suspicious folder appdata

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1543.003` Create or Modify System Process: Windows Service
Privilege Escalation	`T1543.003` Create or Modify System Process: Windows Service

Telemetry coverage

Provider	Record / event type
Service-Control-Manager	Event ID 7045: A service was installed in the system.

Rule body

title: Service Installation in Suspicious Folder
id: 5e993621-67d4-488a-b9ae-b420d08b96cb
status: test
description: Detects service installation in suspicious folder appdata
author: pH-T (Nextron Systems)
references:
    - Internal Research
date: 2022-03-18
modified: 2024-01-18
tags:
    - attack.persistence
    - attack.privilege-escalation
    - car.2013-09-005
    - attack.t1543.003
logsource:
    product: windows
    service: system
detection:
    selection:
        Provider_Name: 'Service Control Manager'
        EventID: 7045
        ImagePath|contains:
            - '\AppData\'
            - '\\\\127.0.0.1'
            - '\\\\localhost'
    filter_optional_zoom:
        ServiceName: 'Zoom Sharing Service'
        ImagePath|contains: ':\Program Files\Common Files\Zoom\Support\CptService.exe'
    condition: selection and not 1 of filter_optional_*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

selection and not 1 of filter_optional_*

Stage 1: `selection`

selection:
    Provider_Name: 'Service Control Manager'
    EventID: 7045
    ImagePath|contains:
        - '\AppData\'
        - '\\\\127.0.0.1'
        - '\\\\localhost'

Stage 2: `not filter_optional_zoom`

filter_optional_zoom:
    ServiceName: 'Zoom Sharing Service'
    ImagePath|contains: ':\Program Files\Common Files\Zoom\Support\CptService.exe'

Exclusions

The rule actively suppresses these predicates.

Field	Kind	Excluded values	Search
`ImagePath`	match	`:\Program Files\Common Files\Zoom\Support\CptService.exe`	`excludes:ImagePath` `field:"ImagePath" value:":\Program Files\Common Files\Zoom\Support\CptService.exe"`
`ServiceName`	eq	`Zoom Sharing Service`	`excludes:ServiceName` `field:"ServiceName" value:"Zoom Sharing Service"`

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ImagePath`	match	`\AppData\` `\\\\127.0.0.1` `\\\\localhost`	`field:"ImagePath" kind:match`
`Provider_Name`	eq	`Service Control Manager` corpus 50 (sigma 50)	`field:"Provider_Name" kind:eq value:"Service Control Manager"`

Service Installation in Suspicious Folder

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Stage 2: not filter_optional_zoom

Exclusions

Indicators

Stage 0: `condition`

Stage 1: `selection`

Stage 2: `not filter_optional_zoom`