KrbRelayUp Service Installation

Status: test
Severity: high
Log source: product windows, service system
Author: Sittikorn S, Tim Shelton
Source: github.com/SigmaHQ/sigma

Detects service creation from KrbRelayUp tool used for privilege escalation in Windows domain environments where LDAP signing is not enforced (the default settings)

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1543` Create or Modify System Process
Privilege Escalation	`T1543` Create or Modify System Process

Telemetry coverage

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

Rule body

title: KrbRelayUp Service Installation
id: e97d9903-53b2-41fc-8cb9-889ed4093e80
status: test
description: Detects service creation from KrbRelayUp tool used for privilege escalation in Windows domain environments where LDAP signing is not enforced (the default settings)
references:
    - https://github.com/Dec0ne/KrbRelayUp
author: Sittikorn S, Tim Shelton
date: 2022-05-11
modified: 2022-10-05
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1543
logsource:
    product: windows
    service: system
detection:
    selection:
        EventID: 7045
        ServiceName: 'KrbSCM'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    EventID: 7045
    ServiceName: 'KrbSCM'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ServiceName`	eq	`KrbSCM` corpus 3 (sigma 2, splunk 1)	`field:"ServiceName" kind:eq value:"KrbSCM"`