Corelight - Network Service Scanning Multiple IP Addresses

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Id	599570d4-06f8-4939-8e29-95cd003f1abd
Rulename	Corelight - Network Service Scanning Multiple IP Addresses
Description	Identify scanning of services that may be available on the internal network.
Severity	Medium
Tactics	InitialAccess
Techniques	T1566
Required data connectors	Corelight
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/Corelight/Analytic Rules/CorelightNetworkServiceScanning.yaml
Version	2.1.0
Arm template	599570d4-06f8-4939-8e29-95cd003f1abd.json

KQL

let threshold = 25;
union corelight_conn, corelight_conn_red
| where local_resp == true
| where local_orig == true
| where conn_state in~ ('S0', 'REJ')
| where history !contains 'D'
| summarize count() by id_orig_h, id_resp_p, bin(TimeGenerated, 1m)
| where count_ > threshold

YAML

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightNetworkServiceScanning.yaml
severity: Medium
queryFrequency: 1h
status: Available
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: id_orig_h
  entityType: IP
triggerOperator: gt
query: |
  let threshold = 25;
  union corelight_conn, corelight_conn_red
  | where local_resp == true
  | where local_orig == true
  | where conn_state in~ ('S0', 'REJ')
  | where history !contains 'D'
  | summarize count() by id_orig_h, id_resp_p, bin(TimeGenerated, 1m)
  | where count_ > threshold  
queryPeriod: 1h
kind: Scheduled
id: 599570d4-06f8-4939-8e29-95cd003f1abd
relevantTechniques:
- T1566
description: |
    'Identify scanning of services that may be available on the internal network.'
requiredDataConnectors:
- dataTypes:
  - Corelight_v2_conn
  - Corelight_v2_conn_red
  - corelight_conn
  - corelight_conn_red
  connectorId: Corelight
triggerThreshold: 0
tactics:
- InitialAccess
name: Corelight - Network Service Scanning Multiple IP Addresses
version: 2.1.0

ARM