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

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

ARM