NGINX - Multiple server errors from single IP address

Back


Id	b3ae0033-552e-4c3c-b493-3edffb4473bb
Rulename	NGINX - Multiple server errors from single IP address
Description	Detects multiple server errors from one source in short timeframe
Severity	Medium
Tactics	Impact InitialAccess
Techniques	T1498 T1190 T1133
Required data connectors	CustomLogsAma
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NGINX HTTP Server/Analytic Rules/NGINXMultipleServerErrorsFromSingleIP.yaml
Version	1.0.2
Arm template	b3ae0033-552e-4c3c-b493-3edffb4473bb.json

KQL

let threshold = 100;
NGINXHTTPServer
| where tolong(HttpStatusCode) >= 500 and tolong(HttpStatusCode) <= 599 
| summarize MultipleServerErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
| where MultipleServerErrors > threshold
| extend IPCustomEntity = SrcIpAddr

YAML

description: |
    'Detects multiple server errors from one source in short timeframe'
version: 1.0.2
triggerThreshold: 0
tactics:
- Impact
- InitialAccess
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NGINX HTTP Server/Analytic Rules/NGINXMultipleServerErrorsFromSingleIP.yaml
triggerOperator: gt
status: Available
id: b3ae0033-552e-4c3c-b493-3edffb4473bb
name: NGINX - Multiple server errors from single IP address
queryFrequency: 1h
severity: Medium
kind: Scheduled
entityMappings:
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
relevantTechniques:
- T1498
- T1190
- T1133
query: |
  let threshold = 100;
  NGINXHTTPServer
  | where tolong(HttpStatusCode) >= 500 and tolong(HttpStatusCode) <= 599 
  | summarize MultipleServerErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | where MultipleServerErrors > threshold
  | extend IPCustomEntity = SrcIpAddr  
requiredDataConnectors:
- dataTypes:
  - NGINX_CL
  connectorId: CustomLogsAma

ARM