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

entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPStart
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPStop
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: EntityName
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: TargetDetails
queryFrequency: 1h
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
  - Syslog
  connectorId: SyslogAma
kind: Scheduled
triggerThreshold: 0
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.'
relevantTechniques:
- T1078
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GitLab/Analytic Rules/GitLab_Impersonation.yaml
queryPeriod: 1d
version: 1.0.2
name: GitLab - User Impersonation
status: Available
id: 0f4f16a2-b464-4c10-9a42-993da3e15a40
severity: Medium
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  
tactics:
- Persistence

ARM