Windows KrbRelayUp Service Creation

name: Windows KrbRelayUp Service Creation
id: e40ef542-8241-4419-9af4-6324582ea60a
version: 11
creation_date: '2022-05-02'
modification_date: '2026-05-13'
author: Michael Haag, Splunk
status: production
type: TTP
description: The following analytic detects the creation of a service with the default name "KrbSCM" associated with the KrbRelayUp tool. It leverages Windows System Event Logs, specifically EventCode 7045, to identify this activity. This behavior is significant as KrbRelayUp is a known tool used for privilege escalation attacks. If confirmed malicious, this activity could allow an attacker to escalate privileges, potentially gaining unauthorized access to sensitive systems and data.
data_source:
    - Windows Event Log System 7045
search: |-
    `wineventlog_system` EventCode=7045 ServiceName IN ("KrbSCM")
      | stats count min(_time) as firstTime max(_time) as lastTime
        BY dest EventCode ImagePath
           ServiceName StartType ServiceType
      | `security_content_ctime(firstTime)`
      | `security_content_ctime(lastTime)`
      | `windows_krbrelayup_service_creation_filter`
how_to_implement: To successfully implement this search, you need to be ingesting Windows System Event Logs with 7045 EventCode enabled. The Windows TA is also required.
known_false_positives: False positives should be limited as this is specific to KrbRelayUp based attack. Filter as needed.
references:
    - https://github.com/Dec0ne/KrbRelayUp
finding:
    title: A service was created on $dest$, related to KrbRelayUp.
    entity:
        field: dest
        type: system
        score: 50
analytic_story:
    - Local Privilege Escalation With KrbRelayUp
    - Compromised Windows Host
asset_type: Endpoint
mitre_attack_id:
    - T1543.003
product:
    - Splunk Enterprise
    - Splunk Enterprise Security
    - Splunk Cloud
category: endpoint
security_domain: endpoint