Detection rules › Kusto
Digital Guardian - Possible SMTP protocol abuse
'Detects possible SMTP protocol abuse.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Exfiltration |
Rule body
id: a374a933-f6c4-4200-8682-70402a9054dd
name: Digital Guardian - Possible SMTP protocol abuse
description: |
'Detects possible SMTP protocol abuse.'
severity: High
status: Available
requiredDataConnectors:
- connectorId: SyslogAma
datatypes:
- Syslog
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- Exfiltration
relevantTechniques:
- T1048
query: |
DigitalGuardianDLPEvent
| where NetworkApplicationProtocol =~ 'SMTP'
| where DstPortNumber != 25
| extend AccountCustomEntity = SrcUserName
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: AccountCustomEntity
version: 1.0.2
kind: Scheduled
Stages and Predicates
Stage 1: source
DigitalGuardianDLPEvent
Stage 2: where
| where NetworkApplicationProtocol =~ 'SMTP'
Stage 3: where
| where DstPortNumber != 25
Stage 4: extend
| extend AccountCustomEntity = SrcUserName
Indicators
These rows show field, operator, and value matches.
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
AccountCustomEntity | extend |