Potential SPN Enumeration Via Setspn.EXE

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: Markus Neis, keepwatch
Source: github.com/SigmaHQ/sigma

Detects service principal name (SPN) enumeration used for Kerberoasting

Known false positives

Administration activity

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1558.003` Steal or Forge Kerberos Tickets: Kerberoasting

Telemetry coverage

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

Rule body

title: Potential SPN Enumeration Via Setspn.EXE
id: 1eeed653-dbc8-4187-ad0c-eeebb20e6599
status: test
description: Detects service principal name (SPN) enumeration used for Kerberoasting
references:
    - https://web.archive.org/web/20200329173843/https://p16.praetorian.com/blog/how-to-use-kerberoasting-t1208-for-privilege-escalation
    - https://www.praetorian.com/blog/how-to-use-kerberoasting-t1208-for-privilege-escalation/?edition=2019
author: Markus Neis, keepwatch
date: 2018-11-14
modified: 2023-10-23
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    category: process_creation
    product: windows
detection:
    selection_pe:
        - Image|endswith: '\setspn.exe'
        - OriginalFileName: 'setspn.exe'
        - Description|contains|all:
              - 'Query or reset the computer'
              - 'SPN attribute'
    selection_cli:
        CommandLine|contains:
            - ' -q '
            - ' /q '
    condition: all of selection_*
falsepositives:
    - Administration activity
level: medium

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_pe`

selection_pe:
    - Image|endswith: '\setspn.exe'
    - OriginalFileName: 'setspn.exe'
    - Description|contains|all:
          - 'Query or reset the computer'
          - 'SPN attribute'

Stage 2: `selection_cli`

selection_cli:
    CommandLine|contains:
        - ' -q '
        - ' /q '

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`-q` corpus 2 (sigma 2) `/q` corpus 2 (sigma 1, splunk 1)	`field:"CommandLine" kind:match`
`Description`	match	`Query or reset the computer` `SPN attribute`	`field:"Description" kind:match`
`Image`	ends_with	`\setspn.exe` corpus 3 (sigma 3)	`field:"Image" kind:ends_with value:"\setspn.exe"`
`OriginalFileName`	eq	`setspn.exe` corpus 2 (sigma 1, splunk 1)	`field:"OriginalFileName" kind:eq value:"setspn.exe"`

Potential SPN Enumeration Via Setspn.EXE

Known false positives

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection_pe

Stage 2: selection_cli

Indicators

Stage 0: `condition`

Stage 1: `selection_pe`

Stage 2: `selection_cli`