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

relevantTechniques:
- T1566
name: Corelight - Network Service Scanning Multiple IP Addresses
version: 2.1.0
entityMappings:
- fieldMappings:
  - columnName: id_orig_h
    identifier: Address
  entityType: IP
triggerThreshold: 0
kind: Scheduled
queryFrequency: 1h
description: |
    'Identify scanning of services that may be available on the internal network.'
queryPeriod: 1h
id: 599570d4-06f8-4939-8e29-95cd003f1abd
requiredDataConnectors:
- connectorId: Corelight
  dataTypes:
  - Corelight_v2_conn
  - Corelight_v2_conn_red
  - corelight_conn
  - corelight_conn_red
tactics:
- InitialAccess
severity: Medium
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightNetworkServiceScanning.yaml
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  
triggerOperator: gt

ARM