GitLab - External User Added to GitLab
Id | c1544d8f-cbbd-4e35-8d32-5b9312279833 |
Rulename | GitLab - External User Added to GitLab |
Description | This queries GitLab Application logs to list external user accounts (i.e.: account not in allow-listed domains) which have been added to GitLab users. |
Severity | Medium |
Tactics | Persistence |
Techniques | T1136 |
Required data connectors | Syslog |
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_ExternalUser.yaml |
Version | 1.0.0 |
Arm template | c1544d8f-cbbd-4e35-8d32-5b9312279833.json |
// List of allow-listed domains
let allowedDomain = pack_array("mydomain.com");
GitLabAudit
| where AddAction == "user"
| project AuthorName, IPAddress, User = EntityName
| join (GitLabApp
| where UserAdded == 1
| parse kind=regex Message with "User \"" User "\"" EmailAddress " was created"
| project tostring(User), EmailAddress = substring(EmailAddress,2,strlen(EmailAddress)-3)) on User
| project AuthorName, IPAddress, User, EmailAddress, DomainName = tostring(extract("@(.*)$", 1, EmailAddress))
| where allowedDomain !contains DomainName
description: |
'This queries GitLab Application logs to list external user accounts (i.e.: account not in allow-listed domains) which have been added to GitLab users.'
queryPeriod: 1d
name: GitLab - External User Added to GitLab
triggerThreshold: 0
tactics:
- Persistence
severity: Medium
kind: Scheduled
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPAddress
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: User
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AuthorName
- entityType: DNS
fieldMappings:
- identifier: DomainName
columnName: DomainName
queryFrequency: 1h
triggerOperator: gt
id: c1544d8f-cbbd-4e35-8d32-5b9312279833
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GitLab/Analytic Rules/GitLab_ExternalUser.yaml
version: 1.0.0
query: |
// List of allow-listed domains
let allowedDomain = pack_array("mydomain.com");
GitLabAudit
| where AddAction == "user"
| project AuthorName, IPAddress, User = EntityName
| join (GitLabApp
| where UserAdded == 1
| parse kind=regex Message with "User \"" User "\"" EmailAddress " was created"
| project tostring(User), EmailAddress = substring(EmailAddress,2,strlen(EmailAddress)-3)) on User
| project AuthorName, IPAddress, User, EmailAddress, DomainName = tostring(extract("@(.*)$", 1, EmailAddress))
| where allowedDomain !contains DomainName
requiredDataConnectors:
- connectorId: Syslog
dataTypes:
- Syslog
relevantTechniques:
- T1136
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/c1544d8f-cbbd-4e35-8d32-5b9312279833')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/c1544d8f-cbbd-4e35-8d32-5b9312279833')]",
"properties": {
"alertRuleTemplateName": "c1544d8f-cbbd-4e35-8d32-5b9312279833",
"customDetails": null,
"description": "'This queries GitLab Application logs to list external user accounts (i.e.: account not in allow-listed domains) which have been added to GitLab users.'\n",
"displayName": "GitLab - External User Added to GitLab",
"enabled": true,
"entityMappings": [
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IPAddress",
"identifier": "Address"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "User",
"identifier": "FullName"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AuthorName",
"identifier": "FullName"
}
]
},
{
"entityType": "DNS",
"fieldMappings": [
{
"columnName": "DomainName",
"identifier": "DomainName"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GitLab/Analytic Rules/GitLab_ExternalUser.yaml",
"query": "// List of allow-listed domains\nlet allowedDomain = pack_array(\"mydomain.com\");\nGitLabAudit\n| where AddAction == \"user\"\n| project AuthorName, IPAddress, User = EntityName\n| join (GitLabApp \n| where UserAdded == 1\n| parse kind=regex Message with \"User \\\"\" User \"\\\"\" EmailAddress \" was created\"\n| project tostring(User), EmailAddress = substring(EmailAddress,2,strlen(EmailAddress)-3)) on User\n| project AuthorName, IPAddress, User, EmailAddress, DomainName = tostring(extract(\"@(.*)$\", 1, EmailAddress))\n| where allowedDomain !contains DomainName\n",
"queryFrequency": "PT1H",
"queryPeriod": "P1D",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Persistence"
],
"techniques": [
"T1136"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}