Detection rules › Splunk
Windows KrbRelayUp Service Creation
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.
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 |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Service-Control-Manager | 7045 |
Stages and Predicates
Stage 1: search
search EventCode=7045 ServiceName="KrbSCM"
Stage 2: stats
stats BY dest, EventCode, ImagePath, ServiceName, StartType, ServiceType
Stage 3: search
search
Stage 4: search
search
Stage 5: search
search `macro`
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.
| Field | Kind | Values |
|---|---|---|
EventCode | eq |
|
ServiceName | in |
|
Neighbors
Broader alternatives (more inclusive than this rule)
These rules match a superset of what this rule catches. They cover the same events plus more. Use them if you want wider coverage and can absorb more false positives.
- Invoke-Obfuscation Obfuscated IEX Invocation - System (drops 2 filters this rule applies)
- Malicious Powershell Executed As A Service (drops 1 filter this rule applies)
- Randomly Generated Windows Service Name (drops 1 filter this rule applies)
- Windows Service Created with Suspicious Service Name (drops 1 filter this rule applies)