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

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

ARM