Mimecast Targeted Threat Protection - Impersonation Protect

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Id	d8e7eca6-4b59-4069-a31e-a022b2a12ea4
Rulename	Mimecast Targeted Threat Protection - Impersonation Protect
Description	Detects a maliciously tagged impersonation
Severity	High
Tactics	Exfiltration Collection Discovery
Techniques	T1114
Required data connectors	MimecastTTPAPI
Kind	Scheduled
Query frequency	5m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastTTP/Analytic Rules/MimecastTTPImpersonation.yaml
Version	1.0.0
Arm template	d8e7eca6-4b59-4069-a31e-a022b2a12ea4.json

KQL

MimecastTTPImpersonation_CL| where taggedMalicious_b == true;

YAML

tactics:
- Exfiltration
- Collection
- Discovery
triggerThreshold: 0
queryPeriod: 15m
alertRuleTemplateName: 
requiredDataConnectors:
- connectorId: MimecastTTPAPI
  dataTypes:
  - MimecastTTPImpersonation_CL
id: d8e7eca6-4b59-4069-a31e-a022b2a12ea4
eventGroupingSettings:
  aggregationKind: AlertPerResult
queryFrequency: 5m
suppressionEnabled: false
relevantTechniques:
- T1114
description: Detects a maliciously tagged impersonation
name: Mimecast Targeted Threat Protection - Impersonation Protect
enabled: true
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - identifier: Sender
    columnName: senderAddress_s
  - identifier: SenderIP
    columnName: senderIpAddress_s
  - identifier: Recipient
    columnName: recipientAddress_s
query: MimecastTTPImpersonation_CL| where taggedMalicious_b == true;
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastTTP/Analytic Rules/MimecastTTPImpersonation.yaml
severity: High
kind: Scheduled
suppressionDuration: 5h
incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: 1d
  createIncident: true
version: 1.0.0

ARM