Detection rules › Kusto
GWorkspace - Multiple user agents for single source
'Detects requests with different user agents from one source in short timeframe.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | |
| Collection |
Rule body
id: 6ff0e16e-5999-11ec-bf63-0242ac130002
name: GWorkspace - Multiple user agents for single source
description: |
'Detects requests with different user agents from one source in short timeframe.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: GoogleWorkspaceReportsAPI
dataTypes:
- GWorkspaceActivityReports
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- Persistence
- Collection
relevantTechniques:
- T1185
- T1176
query: |
let threshold = 5;
GWorkspaceActivityReports
| where isnotempty(UserAgentOriginal)
| summarize user_ua = makeset(UserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)
| where array_length(user_ua) > threshold
| extend IPCustomEntity = SrcIpAddr
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
version: 1.0.1
kind: Scheduled
Stages and Predicates
Parameters
let threshold = 5;
Stage 1: source
GWorkspaceActivityReports
Stage 2: where
| where isnotempty(UserAgentOriginal)
Stage 3: summarize
| summarize user_ua = makeset(UserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)
Stage 4: where
| where array_length(user_ua) > threshold
Stage 5: extend
| extend IPCustomEntity = SrcIpAddr
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
UserAgentOriginal | is_not_null | field:"UserAgentOriginal" kind:is_not_null |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
SrcIpAddr | summarize |
user_ua | summarize |
IPCustomEntity | extend |