Azure DevOps Pull Request Policy Bypassing - Historic allow list
Id | 4d8de9e6-263e-4845-8618-cd23a4f58b70 |
Rulename | Azure DevOps Pull Request Policy Bypassing - Historic allow list |
Description | This detection builds an allow list of historic PR policy bypasses and compares to recent history, flagging pull request bypasses that are not manually in the allow list and not historically included in the allow list. |
Severity | Medium |
Tactics | Persistence |
Techniques | T1098 |
Kind | Scheduled |
Query frequency | 3h |
Query period | 14d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/AzDOHistoricPrPolicyBypassing.yaml |
Version | 1.0.6 |
Arm template | 4d8de9e6-263e-4845-8618-cd23a4f58b70.json |
let starttime = 14d;
let endtime = 3h;
// Add full UPN (user@domain.com) to Authorized Bypassers to ignore policy bypasses by certain authorized users
let AuthorizedBypassers = dynamic(['foo@baz.com', 'test@foo.com']);
let historicBypassers = ADOAuditLogs
| where TimeGenerated between (ago(starttime) .. ago(endtime))
| where OperationName == 'Git.RefUpdatePoliciesBypassed'
| distinct ActorUPN;
ADOAuditLogs
| where TimeGenerated >= ago(endtime)
| where OperationName == 'Git.RefUpdatePoliciesBypassed'
| where ActorUPN !in (historicBypassers) and ActorUPN !in (AuthorizedBypassers)
| parse ScopeDisplayName with OrganizationName '(Organization)'
| project TimeGenerated, ActorUPN, IpAddress, UserAgent, OrganizationName, ProjectName, RepoName = Data.RepoName, AlertDetails = Details, Branch = Data.Name,
BypassReason = Data.BypassReason, PRLink = strcat('https://dev.azure.com/', OrganizationName, '/', ProjectName, '/_git/', Data.RepoName, '/pullrequest/', Data.PullRequestId)
| extend timestamp = TimeGenerated
| extend AccountName = tostring(split(ActorUPN, "@")[0]), AccountUPNSuffix = tostring(split(ActorUPN, "@")[1])
kind: Scheduled
description: |
'This detection builds an allow list of historic PR policy bypasses and compares to recent history, flagging pull request bypasses that are not manually in the allow list and not historically included in the allow list.'
query: |
let starttime = 14d;
let endtime = 3h;
// Add full UPN (user@domain.com) to Authorized Bypassers to ignore policy bypasses by certain authorized users
let AuthorizedBypassers = dynamic(['foo@baz.com', 'test@foo.com']);
let historicBypassers = ADOAuditLogs
| where TimeGenerated between (ago(starttime) .. ago(endtime))
| where OperationName == 'Git.RefUpdatePoliciesBypassed'
| distinct ActorUPN;
ADOAuditLogs
| where TimeGenerated >= ago(endtime)
| where OperationName == 'Git.RefUpdatePoliciesBypassed'
| where ActorUPN !in (historicBypassers) and ActorUPN !in (AuthorizedBypassers)
| parse ScopeDisplayName with OrganizationName '(Organization)'
| project TimeGenerated, ActorUPN, IpAddress, UserAgent, OrganizationName, ProjectName, RepoName = Data.RepoName, AlertDetails = Details, Branch = Data.Name,
BypassReason = Data.BypassReason, PRLink = strcat('https://dev.azure.com/', OrganizationName, '/', ProjectName, '/_git/', Data.RepoName, '/pullrequest/', Data.PullRequestId)
| extend timestamp = TimeGenerated
| extend AccountName = tostring(split(ActorUPN, "@")[0]), AccountUPNSuffix = tostring(split(ActorUPN, "@")[1])
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/AzDOHistoricPrPolicyBypassing.yaml
entityMappings:
- entityType: Account
fieldMappings:
- columnName: ActorUPN
identifier: FullName
- columnName: AccountName
identifier: Name
- columnName: AccountUPNSuffix
identifier: UPNSuffix
- entityType: IP
fieldMappings:
- columnName: IpAddress
identifier: Address
- entityType: URL
fieldMappings:
- columnName: PRLink
identifier: Url
tactics:
- Persistence
triggerThreshold: 0
version: 1.0.6
name: Azure DevOps Pull Request Policy Bypassing - Historic allow list
queryPeriod: 14d
requiredDataConnectors: []
triggerOperator: gt
queryFrequency: 3h
status: Available
relevantTechniques:
- T1098
severity: Medium
id: 4d8de9e6-263e-4845-8618-cd23a4f58b70
{
"$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/4d8de9e6-263e-4845-8618-cd23a4f58b70')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4d8de9e6-263e-4845-8618-cd23a4f58b70')]",
"properties": {
"alertRuleTemplateName": "4d8de9e6-263e-4845-8618-cd23a4f58b70",
"customDetails": null,
"description": "'This detection builds an allow list of historic PR policy bypasses and compares to recent history, flagging pull request bypasses that are not manually in the allow list and not historically included in the allow list.'\n",
"displayName": "Azure DevOps Pull Request Policy Bypassing - Historic allow list",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "ActorUPN",
"identifier": "FullName"
},
{
"columnName": "AccountName",
"identifier": "Name"
},
{
"columnName": "AccountUPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IpAddress",
"identifier": "Address"
}
]
},
{
"entityType": "URL",
"fieldMappings": [
{
"columnName": "PRLink",
"identifier": "Url"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/AzDOHistoricPrPolicyBypassing.yaml",
"query": "let starttime = 14d;\nlet endtime = 3h;\n// Add full UPN (user@domain.com) to Authorized Bypassers to ignore policy bypasses by certain authorized users\nlet AuthorizedBypassers = dynamic(['foo@baz.com', 'test@foo.com']);\nlet historicBypassers = ADOAuditLogs\n| where TimeGenerated between (ago(starttime) .. ago(endtime))\n| where OperationName == 'Git.RefUpdatePoliciesBypassed'\n| distinct ActorUPN;\nADOAuditLogs\n| where TimeGenerated >= ago(endtime)\n| where OperationName == 'Git.RefUpdatePoliciesBypassed'\n| where ActorUPN !in (historicBypassers) and ActorUPN !in (AuthorizedBypassers)\n| parse ScopeDisplayName with OrganizationName '(Organization)'\n| project TimeGenerated, ActorUPN, IpAddress, UserAgent, OrganizationName, ProjectName, RepoName = Data.RepoName, AlertDetails = Details, Branch = Data.Name,\n BypassReason = Data.BypassReason, PRLink = strcat('https://dev.azure.com/', OrganizationName, '/', ProjectName, '/_git/', Data.RepoName, '/pullrequest/', Data.PullRequestId)\n| extend timestamp = TimeGenerated\n| extend AccountName = tostring(split(ActorUPN, \"@\")[0]), AccountUPNSuffix = tostring(split(ActorUPN, \"@\")[1])\n",
"queryFrequency": "PT3H",
"queryPeriod": "P14D",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Persistence"
],
"techniques": [
"T1098"
],
"templateVersion": "1.0.6",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}