GitLab - User Impersonation

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Id	0f4f16a2-b464-4c10-9a42-993da3e15a40
Rulename	GitLab - User Impersonation
Description	This queries GitLab Audit Logs for user impersonation. A malicious operator or a compromised admin account could leverage the impersonation feature of GitLab to change code or repository settings bypassing usual processes. This hunting queries allows you to track the audit actions done under impersonation.
Severity	Medium
Tactics	Persistence
Techniques	T1078
Required data connectors	SyslogAma
Kind	Scheduled
Query frequency	1h
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GitLab/Analytic Rules/GitLab_Impersonation.yaml
Version	1.0.2
Arm template	0f4f16a2-b464-4c10-9a42-993da3e15a40.json

KQL

let impersonationStart = (GitLabAudit
| where CustomMessage == 'Started Impersonation');
let impersonationStop = (GitLabAudit
| where CustomMessage == 'Stopped Impersonation');
impersonationStart
| join kind=inner impersonationStop on $left.TargetID == $right.TargetID and $left.AuthorID == $right.AuthorID 
| where EventTime1 > EventTime
| extend TimeGenerated, AuthorID, AuthorName, TargetID, TargetDetails = TargetDetails, IPStart = IPAddress, IPStop = IPAddress1, ImpStartTime = EventTime, ImpStopTime = EventTime1, EntityName
| join kind=inner (GitLabAudit | extend ActionTime = EventTime, AuthorName) on $left.TargetDetails == $right.AuthorName 
| where ImpStartTime < ActionTime and ActionTime > ImpStopTime

YAML

triggerOperator: gt
tactics:
- Persistence
triggerThreshold: 0
kind: Scheduled
description: |
    'This queries GitLab Audit Logs for user impersonation. A malicious operator or a compromised admin account could leverage the impersonation feature of GitLab to change code or repository settings bypassing usual processes. This hunting queries allows you to track the audit actions done under impersonation.'
severity: Medium
id: 0f4f16a2-b464-4c10-9a42-993da3e15a40
requiredDataConnectors:
- connectorId: SyslogAma
  dataTypes:
  - Syslog
query: |
  let impersonationStart = (GitLabAudit
  | where CustomMessage == 'Started Impersonation');
  let impersonationStop = (GitLabAudit
  | where CustomMessage == 'Stopped Impersonation');
  impersonationStart
  | join kind=inner impersonationStop on $left.TargetID == $right.TargetID and $left.AuthorID == $right.AuthorID 
  | where EventTime1 > EventTime
  | extend TimeGenerated, AuthorID, AuthorName, TargetID, TargetDetails = TargetDetails, IPStart = IPAddress, IPStop = IPAddress1, ImpStartTime = EventTime, ImpStopTime = EventTime1, EntityName
  | join kind=inner (GitLabAudit | extend ActionTime = EventTime, AuthorName) on $left.TargetDetails == $right.AuthorName 
  | where ImpStartTime < ActionTime and ActionTime > ImpStopTime  
version: 1.0.2
status: Available
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPStart
    identifier: Address
- entityType: IP
  fieldMappings:
  - columnName: IPStop
    identifier: Address
- entityType: Account
  fieldMappings:
  - columnName: EntityName
    identifier: FullName
- entityType: Account
  fieldMappings:
  - columnName: TargetDetails
    identifier: FullName
name: GitLab - User Impersonation
queryPeriod: 1d
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GitLab/Analytic Rules/GitLab_Impersonation.yaml
relevantTechniques:
- T1078

ARM