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Detection rules › Sigma

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

TacticTechniques
PersistenceT1543 Create or Modify System Process
Privilege EscalationT1543 Create or Modify System Process

Event coverage

ProviderEvent
Service-Control-ManagerEvent ID 7045

Rule body yaml

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

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
ServiceNameeq
  • KrbSCM corpus 3 (sigma 2, splunk 1)