Corelight - Forced External Outbound SMB

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Id	73f23aa2-5cc4-4507-940b-75c9092e9e01
Rulename	Corelight - Forced External Outbound SMB
Description	Detects SMB requests that originate internally and communicate with an external IP address.
Severity	Medium
Tactics	CredentialAccess
Techniques	T1187
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/CorelightForcedExternalOutboundSMB.yaml
Version	2.1.0
Arm template	73f23aa2-5cc4-4507-940b-75c9092e9e01.json

KQL

union corelight_conn, corelight_conn_red
| where local_orig == true
| where local_resp == false
| where history hasprefix 'Sh' and service hasprefix 'smb'

YAML

id: 73f23aa2-5cc4-4507-940b-75c9092e9e01
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightForcedExternalOutboundSMB.yaml
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: id_orig_h
  entityType: IP
requiredDataConnectors:
- dataTypes:
  - Corelight_v2_conn
  - Corelight_v2_conn_red
  - corelight_conn
  - corelight_conn_red
  connectorId: Corelight
queryFrequency: 1h
queryPeriod: 1h
status: Available
query: |
  union corelight_conn, corelight_conn_red
  | where local_orig == true
  | where local_resp == false
  | where history hasprefix 'Sh' and service hasprefix 'smb'  
name: Corelight - Forced External Outbound SMB
kind: Scheduled
tactics:
- CredentialAccess
severity: Medium
relevantTechniques:
- T1187
triggerThreshold: 0
version: 2.1.0
description: |
    'Detects SMB requests that originate internally and communicate with an external IP address.'

ARM