Detection rules › Kusto
App GW WAF - Code Injection
'Identifies a match for a Code Injection 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/attacks/Code_Injection'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | |
| Execution | |
| Privilege Escalation |
Rule body
id: 912a18fc-6165-446b-8740-81ae6c3f75ee
name: App GW WAF - Code Injection
description: |
'Identifies a match for a Code Injection 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/attacks/Code_Injection'
severity: High
status: Available
requiredDataConnectors:
- connectorId: WAF
dataTypes:
- AzureDiagnostics
queryFrequency: 6h
queryPeriod: 6h
triggerOperator: gt
triggerThreshold: 0
tactics:
- DefenseEvasion
- Execution
- InitialAccess
- PrivilegeEscalation
relevantTechniques:
- T1548
- T1203
- T1190
- T1548
tags:
- Code Injection
query: |
let Threshold = 3;
AGWFirewallLogs
| where Action == "Matched"
| where Message has "Injection" or Message has "File Inclusion"
| 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,100), Message = make_set(Message,100), Detail_Message = make_set(DetailedMessage,100), Detail_Data = make_set(DetailedData,100), Total_TransactionId = dcount(TransactionId) by ClientIp, Uri, Action
| where Total_TransactionId >= Threshold
# The Threshold value above can be changed as per your infrastructure's requirement
entityMappings:
- entityType: URL
fieldMappings:
- identifier: Url
columnName: Uri
- entityType: IP
fieldMappings:
- identifier: Address
columnName: ClientIp
version: 1.0.3
kind: Scheduled
Stages and Predicates
Parameters
let Threshold = 3;
Stage 1: source
AGWFirewallLogs
Stage 2: where
| where Action == "Matched"
Stage 3: where
| where Message has "Injection" or Message has "File Inclusion"
Stage 4: project
| project TransactionId, Hostname, RequestUri, TimeGenerated, ClientIp, Message, DetailedMessage, DetailedData
Stage 5: join
| join kind = inner(
AGWFirewallLogs
| where Action == "Blocked") on TransactionId
Stage 6: extend
| extend Uri = strcat(Hostname,RequestUri)
Stage 7: summarize
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), TransactionID = make_set(TransactionId,100), Message = make_set(Message,100), Detail_Message = make_set(DetailedMessage,100), Detail_Data = make_set(DetailedData,100), Total_TransactionId = dcount(TransactionId) by ClientIp, Uri, Action
Stage 8: where
| where Total_TransactionId >= Threshold
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
Action | eq |
| field:"Action" kind:eq |
Message | match |
| field:"Message" kind:match |
Total_TransactionId | ge |
| field:"Total_TransactionId" kind:ge value:"3" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
Action | summarize |
ClientIp | summarize |
Detail_Data | summarize |
Detail_Message | summarize |
EndTime | summarize |
Message | summarize |
StartTime | summarize |
Total_TransactionId | summarize |
TransactionID | summarize |
Uri | summarize |