Azure DevOps Variable Secret Not Secured

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Id	4ca74dc0-8352-4ac5-893c-73571cc78331
Rulename	Azure DevOps Variable Secret Not Secured
Description	Credentials used in the build process may be stored as Azure DevOps variables. To secure these variables they should be stored in KeyVault or marked as Secrets. This detection looks for new variables added with names that suggest they are credentials but where they are not set as Secrets or stored in KeyVault.
Severity	Medium
Tactics	CredentialAccess
Techniques	T1552
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/ADOSecretNotSecured.yaml
Version	1.0.4
Arm template	4ca74dc0-8352-4ac5-893c-73571cc78331.json

KQL

let keywords = dynamic(["secret", "secrets", "password", "PAT", "passwd", "pswd", "pwd", "cred", "creds", "credentials", "credential", "key"]);
ADOAuditLogs
| where OperationName =~ "Library.VariableGroupModified"
| extend Type = tostring(Data.Type)
| extend VariableGroupId = tostring(Data.VariableGroupId)
| extend VariableGroupName = tostring(Data.VariableGroupName)
| mv-expand Data.Variables
| where VariableGroupName has_any (keywords) or Data_Variables has_any (keywords)
| where Type != "AzureKeyVault"
| where Data_Variables !has "IsSecret"
| extend timestamp = TimeGenerated
| extend AccountName = tostring(split(ActorUPN, "@")[0]), AccountUPNSuffix = tostring(split(ActorUPN, "@")[1])

YAML

entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: ActorUPN
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IpAddress
tactics:
- CredentialAccess
requiredDataConnectors: []
id: 4ca74dc0-8352-4ac5-893c-73571cc78331
severity: Medium
status: Available
query: |
  let keywords = dynamic(["secret", "secrets", "password", "PAT", "passwd", "pswd", "pwd", "cred", "creds", "credentials", "credential", "key"]);
  ADOAuditLogs
  | where OperationName =~ "Library.VariableGroupModified"
  | extend Type = tostring(Data.Type)
  | extend VariableGroupId = tostring(Data.VariableGroupId)
  | extend VariableGroupName = tostring(Data.VariableGroupName)
  | mv-expand Data.Variables
  | where VariableGroupName has_any (keywords) or Data_Variables has_any (keywords)
  | where Type != "AzureKeyVault"
  | where Data_Variables !has "IsSecret"
  | 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/ADOSecretNotSecured.yaml
kind: Scheduled
queryPeriod: 1d
version: 1.0.4
name: Azure DevOps Variable Secret Not Secured
queryFrequency: 1d
triggerThreshold: 0
relevantTechniques:
- T1552
description: |
  'Credentials used in the build process may be stored as Azure DevOps variables. To secure these variables they should be stored in KeyVault or marked as Secrets. 
  This detection looks for new variables added with names that suggest they are credentials but where they are not set as Secrets or stored in KeyVault.'  
triggerOperator: gt

ARM