Detection rules › Kusto
Azure DevOps New Extension Added
'Extensions add additional features to Azure DevOps. An attacker could use a malicious extension to conduct malicious activity. This query looks for new extensions that are not from a configurable list of approved publishers.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence |
Rule body
id: bf07ca9c-e408-443a-8939-6860a45a929e
name: Azure DevOps New Extension Added
description: |
'Extensions add additional features to Azure DevOps. An attacker could use a malicious extension to conduct malicious activity.
This query looks for new extensions that are not from a configurable list of approved publishers.'
severity: Low
status: Available
requiredDataConnectors: []
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
- Persistence
relevantTechniques:
- T1505
query: |
let allowed_publishers = dynamic([]);
ADOAuditLogs
| where OperationName =~ "Extension.Installed"
| extend ExtensionName = tostring(Data.ExtensionName)
| extend PublisherName = tostring(Data.PublisherName)
| where PublisherName !in (allowed_publishers)
| project-reorder TimeGenerated, OperationName, ExtensionName, PublisherName, ActorUPN, IpAddress, UserAgent, ScopeDisplayName, Data
| extend timestamp = TimeGenerated
| extend AccountName = tostring(split(ActorUPN, "@")[0]), AccountUPNSuffix = tostring(split(ActorUPN, "@")[1])
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: ActorUPN
- identifier: Name
columnName: AccountName
- identifier: UPNSuffix
columnName: AccountUPNSuffix
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IpAddress
version: 1.0.4
kind: Scheduled
Stages and Predicates
Parameters
let allowed_publishers = dynamic([]);
Stage 1: source
ADOAuditLogs
Stage 2: where
| where OperationName =~ "Extension.Installed"
Stage 3: extend
| extend ExtensionName = tostring(Data.ExtensionName)
Stage 4: extend
| extend PublisherName = tostring(Data.PublisherName)
Stage 5: where
| where PublisherName !in (allowed_publishers)
Stage 6: project-reorder
| project-reorder TimeGenerated, OperationName, ExtensionName, PublisherName, ActorUPN, IpAddress, UserAgent, ScopeDisplayName, Data
Stage 7: extend
| extend timestamp = TimeGenerated
Stage 8: extend
| extend AccountName = tostring(split(ActorUPN, "@")[0]), AccountUPNSuffix = tostring(split(ActorUPN, "@")[1])
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
PublisherName | eq | [] | excludes:PublisherName field:"PublisherName" value:"[]" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
OperationName | eq |
| field:"OperationName" kind:eq value:"Extension.Installed" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
ExtensionName | extend |
PublisherName | extend |
timestamp | extend |
AccountName | extend |
AccountUPNSuffix | extend |