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

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

ARM