Detection rules › Kusto
Imperva - Multiple user agents from same source
''Detects suspicious number of user agents from the same IP address.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access |
Rule body
id: 4e8032eb-f04d-4a30-85d3-b74bf2c8f204
name: Imperva - Multiple user agents from same source
description: |
''Detects suspicious number of user agents from the same IP address.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: ImpervaWAFCloudAPI
dataTypes:
- ImpervaWAFCloud
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
relevantTechniques:
- T1190
- T1133
query: |
let threshold = 10;
ImpervaWAFCloud
| summarize d_uas = dcount(HttpUserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)
| where d_uas >= threshold
| extend IPCustomEntity = SrcIpAddr
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
version: 1.0.0
kind: Scheduled
Stages and Predicates
Parameters
let threshold = 10;
Stage 1: source
ImpervaWAFCloud
Stage 2: summarize
| summarize d_uas = dcount(HttpUserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)
Stage 3: where
| where d_uas >= threshold
Stage 4: extend
| extend IPCustomEntity = SrcIpAddr
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
d_uas | ge |
| field:"d_uas" kind:ge value:"10" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
SrcIpAddr | summarize |
d_uas | summarize |
IPCustomEntity | extend |