Detection rules › Kusto
SlackAudit - Empty User Agent
'This query shows connections to the Slack Workspace with empty User Agent.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access |
Rule body
id: 04528635-a5f1-438b-ab74-21ca7bc3aa32
name: SlackAudit - Empty User Agent
description: |
'This query shows connections to the Slack Workspace with empty User Agent.'
severity: Low
status: Available
requiredDataConnectors:
- connectorId: SlackAuditAPI
dataTypes:
- SlackAudit_CL
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
relevantTechniques:
- T1133
query: |
SlackAudit
| where isempty(UserAgentOriginal)
| extend AccountCustomEntity = SrcUserName
| project TimeGenerated, AccountCustomEntity, SrcUserName, UserAgentOriginal
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
alertDetailsOverride:
alertDisplayNameFormat: Slack audit empty user agent for {{SrcUserName}}
alertDescriptionFormat: Slack activity from {{SrcUserName}} at {{TimeGenerated}}.
customDetails:
SlackUser: SrcUserName
UserAgent: UserAgentOriginal
version: 1.0.1
kind: Scheduled
Stages and Predicates
Stage 1: source
SlackAudit
Stage 2: where
| where isempty(UserAgentOriginal)
Stage 3: extend
| extend AccountCustomEntity = SrcUserName
Stage 4: project
| project TimeGenerated, AccountCustomEntity, SrcUserName, UserAgentOriginal
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
UserAgentOriginal | is_null | field:"UserAgentOriginal" kind:is_null |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
AccountCustomEntity | project |
SrcUserName | project |
TimeGenerated | project |
UserAgentOriginal | project |