Front Door Premium WAF - XSS Detection

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Id	b7643904-5081-4920-917e-a559ddc3448f
Rulename	Front Door Premium WAF - XSS Detection
Description	Identifies a match for an XSS attack in the Front Door Premium WAF logs. The threshold value in the query can be changed as per your infrastructure’s requirements. References: https://owasp.org/www-project-top-ten/2017/A7_2017-Cross-Site_Scripting_(XSS)
Severity	High
Tactics	InitialAccess Execution
Techniques	T1189 T1203 T0853
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/AFD-Premium-WAF-XSSDetection.yaml
Version	1.0.2
Arm template	b7643904-5081-4920-917e-a559ddc3448f.json

KQL

let Threshold = 1;
AzureDiagnostics
| where Category =~ "FrontDoorWebApplicationFirewallLog"
| where action_s =~ "AnomalyScoring"
| where details_msg_s has "XSS"
| parse details_data_s with MessageText "Matched Data:" MatchedData "AND " * "table_name FROM " TableName " " *
| project trackingReference_s, host_s, requestUri_s, TimeGenerated, clientIP_s, details_matches_s, details_msg_s, details_data_s, TableName, MatchedData
| join kind = inner(
AzureDiagnostics
| where Category =~ "FrontDoorWebApplicationFirewallLog"
| where action_s =~ "Block") on trackingReference_s
| summarize URI_s = make_set(requestUri_s,100), Table = make_set(TableName,100), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), TrackingReference = make_set(trackingReference_s,100), Matched_Data = make_set(MatchedData,100), Detail_Data = make_set(details_data_s,100), Detail_Message = make_set(details_msg_s,100), Total_TrackingReference = dcount(trackingReference_s) by clientIP_s, host_s, action_s
| where Total_TrackingReference >= Threshold

YAML

description: |
  'Identifies a match for an XSS attack in the Front Door Premium WAF logs. The threshold value in the query can be changed as per your infrastructure's requirements.
   References: https://owasp.org/www-project-top-ten/2017/A7_2017-Cross-Site_Scripting_(XSS)'  
version: 1.0.2
triggerThreshold: 0
tactics:
- InitialAccess
- Execution
queryPeriod: 6h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Web Application Firewall (WAF)/Analytic Rules/AFD-Premium-WAF-XSSDetection.yaml
triggerOperator: gt
status: Available
id: b7643904-5081-4920-917e-a559ddc3448f
name: Front Door Premium WAF - XSS Detection
queryFrequency: 6h
severity: High
kind: Scheduled
entityMappings:
- fieldMappings:
  - columnName: URI_s
    identifier: Url
  entityType: URL
- fieldMappings:
  - columnName: clientIP_s
    identifier: Address
  entityType: IP
relevantTechniques:
- T1189
- T1203
- T0853
query: |
  let Threshold = 1;
  AzureDiagnostics
  | where Category =~ "FrontDoorWebApplicationFirewallLog"
  | where action_s =~ "AnomalyScoring"
  | where details_msg_s has "XSS"
  | parse details_data_s with MessageText "Matched Data:" MatchedData "AND " * "table_name FROM " TableName " " *
  | project trackingReference_s, host_s, requestUri_s, TimeGenerated, clientIP_s, details_matches_s, details_msg_s, details_data_s, TableName, MatchedData
  | join kind = inner(
  AzureDiagnostics
  | where Category =~ "FrontDoorWebApplicationFirewallLog"
  | where action_s =~ "Block") on trackingReference_s
  | summarize URI_s = make_set(requestUri_s,100), Table = make_set(TableName,100), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), TrackingReference = make_set(trackingReference_s,100), Matched_Data = make_set(MatchedData,100), Detail_Data = make_set(details_data_s,100), Detail_Message = make_set(details_msg_s,100), Total_TrackingReference = dcount(trackingReference_s) by clientIP_s, host_s, action_s
  | where Total_TrackingReference >= Threshold  
tags:
- Cross Site Scripting
requiredDataConnectors:
- dataTypes:
  - AzureDiagnostics
  connectorId: WAF

ARM