App Gateway WAF - Scanner Detection

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Id	9b8dd8fd-f192-42eb-84f6-541920400a7a
Rulename	App Gateway WAF - Scanner Detection
Description	Identifies a match for a Scanner detection user agent based attack in the App Gateway WAF logs. The threshold value in the query can be changed as per your infrastructure’s requirements. References: https://owasp.org/www-community/Vulnerability_Scanning_Tools
Severity	High
Tactics	DefenseEvasion Execution InitialAccess Reconnaissance Discovery
Techniques	T1548 T1203 T1190 T1595 T1046
Required data connectors	WAF
Kind	Scheduled
Query frequency	6h
Query period	6h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Web Application Firewall (WAF)/Analytic Rules/App-GW-WAF-Scanner-detection.yaml
Version	1.0.3
Arm template	9b8dd8fd-f192-42eb-84f6-541920400a7a.json

KQL

let Threshold = 3;
AGWFirewallLogs
| where Action == "Matched"
| where Message contains "Found User-Agent associated with security scanner"
| project TransactionId, Hostname, RequestUri, TimeGenerated, ClientIp, Message, DetailedMessage, DetailedData
| join kind = inner(
AGWFirewallLogs
| where Action == "Blocked"
) on TransactionId
| extend Uri = strcat(Hostname,RequestUri)
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), TransactionID = make_set(TransactionId), Message = make_set(Message), Detail_Message = make_set(DetailedMessage), Detail_Data = make_set(DetailedData), Total_TransactionId = dcount(TransactionId) by ClientIp, Uri, Action
| where Total_TransactionId >= Threshold

YAML

description: |
  'Identifies a match for a Scanner detection user agent based attack in the App Gateway WAF logs. The threshold value in the query can be changed as per your infrastructure's requirements.
  References: https://owasp.org/www-community/Vulnerability_Scanning_Tools'  
version: 1.0.3
triggerThreshold: 0
tactics:
- DefenseEvasion
- Execution
- InitialAccess
- Reconnaissance
- Discovery
queryPeriod: 6h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Web Application Firewall (WAF)/Analytic Rules/App-GW-WAF-Scanner-detection.yaml
triggerOperator: gt
status: Available
id: 9b8dd8fd-f192-42eb-84f6-541920400a7a
name: App Gateway WAF - Scanner Detection
queryFrequency: 6h
severity: High
kind: Scheduled
entityMappings:
- fieldMappings:
  - columnName: Uri
    identifier: Url
  entityType: URL
- fieldMappings:
  - columnName: ClientIp
    identifier: Address
  entityType: IP
relevantTechniques:
- T1548
- T1203
- T1190
- T1595
- T1046
query: |
  let Threshold = 3;
  AGWFirewallLogs
  | where Action == "Matched"
  | where Message contains "Found User-Agent associated with security scanner"
  | project TransactionId, Hostname, RequestUri, TimeGenerated, ClientIp, Message, DetailedMessage, DetailedData
  | join kind = inner(
  AGWFirewallLogs
  | where Action == "Blocked"
  ) on TransactionId
  | extend Uri = strcat(Hostname,RequestUri)
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), TransactionID = make_set(TransactionId), Message = make_set(Message), Detail_Message = make_set(DetailedMessage), Detail_Data = make_set(DetailedData), Total_TransactionId = dcount(TransactionId) by ClientIp, Uri, Action
  | where Total_TransactionId >= Threshold  
tags:
- Scanner Detection
requiredDataConnectors:
- dataTypes:
  - AzureDiagnostics
  connectorId: WAF

ARM