Digital Guardian - Possible SMTP protocol abuse

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Id	a374a933-f6c4-4200-8682-70402a9054dd
Rulename	Digital Guardian - Possible SMTP protocol abuse
Description	Detects possible SMTP protocol abuse.
Severity	High
Tactics	Exfiltration
Techniques	T1048
Required data connectors	SyslogAma
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/Digital Guardian Data Loss Prevention/Analytic Rules/DigitalGuardianPossibleProtocolAbuse.yaml
Version	1.0.2
Arm template	a374a933-f6c4-4200-8682-70402a9054dd.json

KQL

DigitalGuardianDLPEvent
| where NetworkApplicationProtocol =~ 'SMTP'
| where DstPortNumber != 25
| extend AccountCustomEntity = SrcUserName

YAML

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Digital Guardian Data Loss Prevention/Analytic Rules/DigitalGuardianPossibleProtocolAbuse.yaml
queryPeriod: 1h
kind: Scheduled
name: Digital Guardian - Possible SMTP protocol abuse
status: Available
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
  entityType: Account
tactics:
- Exfiltration
description: |
    'Detects possible SMTP protocol abuse.'
severity: High
requiredDataConnectors:
- connectorId: SyslogAma
  datatypes:
  - Syslog
queryFrequency: 1h
triggerThreshold: 0
version: 1.0.2
query: |
  DigitalGuardianDLPEvent
  | where NetworkApplicationProtocol =~ 'SMTP'
  | where DstPortNumber != 25
  | extend AccountCustomEntity = SrcUserName  
relevantTechniques:
- T1048
id: a374a933-f6c4-4200-8682-70402a9054dd
triggerOperator: gt

ARM