Detection rules › Kusto
NGINX - Multiple client errors from single IP address
'Detects multiple client errors from one source in short timeframe'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access |
Rule body
id: 42771afe-edb3-4330-bc4a-abf6a5714454
name: NGINX - Multiple client errors from single IP address
description: |
'Detects multiple client errors from one source in short timeframe'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: CustomLogsAma
dataTypes:
- NGINX_CL
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
relevantTechniques:
- T1190
- T1133
query: |
let threshold = 100;
NGINXHTTPServer
| where tolong(HttpStatusCode) >= 400 and tolong(HttpStatusCode) <= 499
| summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
| where MultipleClientErrors > threshold
| extend IPCustomEntity = SrcIpAddr
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
version: 1.0.2
kind: Scheduled
Stages and Predicates
Parameters
let threshold = 100;
Stage 1: source
NGINXHTTPServer
Stage 2: where
| where tolong(HttpStatusCode) >= 400 and tolong(HttpStatusCode) <= 499
Stage 3: summarize
| summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
Stage 4: where
| where MultipleClientErrors > threshold
Stage 5: extend
| extend IPCustomEntity = SrcIpAddr
Indicators
These rows show field, operator, and value matches.
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
MultipleClientErrors | summarize |
SrcIpAddr | summarize |
IPCustomEntity | extend |