Detection rules › Kusto
Imperva - Critical severity event not blocked
'Detects when critical severity event was not blocked.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access |
Rule body
id: 4d365217-f96a-437c-9c57-53594fa261c3
name: Imperva - Critical severity event not blocked
description: |
'Detects when critical severity event was not blocked.'
severity: High
status: Available
requiredDataConnectors:
- connectorId: ImpervaWAFCloudAPI
dataTypes:
- ImpervaWAFCloud
queryFrequency: 10m
queryPeriod: 10m
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
relevantTechniques:
- T1190
- T1133
query: |
ImpervaWAFCloud
| where EventSeverity =~ 'CRITICAL'
| where DvcAction !startswith 'REQ_BLOCKED' or DvcAction !startswith 'REQ_BAD_'
| extend IPCustomEntity = SrcIpAddr
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
version: 1.0.1
kind: Scheduled
Stages and Predicates
Stage 1: source
ImpervaWAFCloud
Stage 2: where
| where EventSeverity =~ 'CRITICAL'
Stage 3: where
| where DvcAction !startswith 'REQ_BLOCKED' or DvcAction !startswith 'REQ_BAD_'
Stage 4: extend
| extend IPCustomEntity = SrcIpAddr
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
EventSeverity | eq |
| field:"EventSeverity" kind:eq value:"CRITICAL" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
IPCustomEntity | extend |