AFD WAF - Code Injection

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Id	ded8168e-c806-4772-af30-10576e0a7529
Rulename	AFD WAF - Code Injection
Description	Identifies a match for a Code Injection based attack in the AFD WAF logs. The threshold value in the query can be changed as per your infrastructure’s requirements. References: https://owasp.org/www-community/attacks/Code_Injection
Severity	High
Tactics	DefenseEvasion Execution InitialAccess PrivilegeEscalation
Techniques	T1548 T1203 T1190 T1548
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-WAF-Code-Injection.yaml
Version	1.0.1
Arm template	ded8168e-c806-4772-af30-10576e0a7529.json

KQL

let Threshold = 3;
AzureDiagnostics
| where Category =~ "FrontDoorWebApplicationFirewallLog"
| where action_s =~ "AnomalyScoring"
| where details_msg_s has "Injection" or details_msg_s has "File Inclusion"
| 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

version: 1.0.1
requiredDataConnectors:
- connectorId: WAF
  dataTypes:
  - AzureDiagnostics
status: Available
entityMappings:
- fieldMappings:
  - identifier: Url
    columnName: URI_s
  entityType: URL
- fieldMappings:
  - identifier: Address
    columnName: clientIP_s
  entityType: IP
tactics:
- DefenseEvasion
- Execution
- InitialAccess
- PrivilegeEscalation
relevantTechniques:
- T1548
- T1203
- T1190
- T1548
queryFrequency: 6h
severity: High
name: AFD WAF - Code Injection
description: |
  'Identifies a match for a Code Injection based attack in the AFD WAF logs. The threshold value in the query can be changed as per your infrastructure's requirements.
  References: https://owasp.org/www-community/attacks/Code_Injection'  
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Web Application Firewall (WAF)/Analytic Rules/AFD-WAF-Code-Injection.yaml
query: |
  let Threshold = 3;
  AzureDiagnostics
  | where Category =~ "FrontDoorWebApplicationFirewallLog"
  | where action_s =~ "AnomalyScoring"
  | where details_msg_s has "Injection" or details_msg_s has "File Inclusion"
  | 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:
- Code Injection
kind: Scheduled
queryPeriod: 6h
triggerOperator: gt
id: ded8168e-c806-4772-af30-10576e0a7529

ARM