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

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

ARM