Mimecast Secure Email Gateway - Impersonation Protect

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Id	2ef77cef-439f-4d94-848f-3eca67510d2f
Rulename	Mimecast Secure Email Gateway - Impersonation Protect
Description	Detects threats from impersonation mail under targeted threat protection.
Severity	High
Tactics	Discovery LateralMovement Collection
Techniques	T1114
Required data connectors	MimecastSEGAPI
Kind	Scheduled
Query frequency	15m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastSEG/MimecastCG_Impersonation.yaml
Version	1.0.0
Arm template	2ef77cef-439f-4d94-848f-3eca67510d2f.json

KQL

MimecastCG
| where Type == "email_ttp_impersonation"
| extend  SenderEnvelope = ['Sender Envelope'] , SenderIp = ['Sender IP']

YAML

incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    matchingMethod: AllEntities
    lookbackDuration: P7D
    reopenClosedIncident: false
    enabled: true
requiredDataConnectors:
- dataTypes:
  - MimecastCG
  connectorId: MimecastSEGAPI
relevantTechniques:
- T1114
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastSEG/MimecastCG_Impersonation.yaml
version: 1.0.0
queryFrequency: 15m
severity: High
suppressionEnabled: false
triggerThreshold: 0
suppressionDuration: 5h
entityMappings:
- fieldMappings:
  - columnName: SenderEnvelope
    identifier: Sender
  - columnName: SenderIp
    identifier: SenderIP
  - columnName: Recipients
    identifier: Recipient
  entityType: MailMessage
name: Mimecast Secure Email Gateway - Impersonation Protect
query: |
  MimecastCG
  | where Type == "email_ttp_impersonation"
  | extend  SenderEnvelope = ['Sender Envelope'] , SenderIp = ['Sender IP']  
tactics:
- Discovery
- LateralMovement
- Collection
queryPeriod: 15m
description: |
    'Detects threats from impersonation mail under targeted threat protection.'
kind: Scheduled
id: 2ef77cef-439f-4d94-848f-3eca67510d2f
enabled: true
eventGroupingSettings:
  aggregationKind: AlertPerResult
status: Available

ARM