Mimecast Secure Email Gateway - AV

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Id	0f0dc725-29dc-48c3-bf10-bd2f34fd1cbb
Rulename	Mimecast Secure Email Gateway - AV
Description	Detects threats from email anti virus scan
Severity	Informational
Tactics	Execution
Techniques	T1053
Required data connectors	MimecastSIEMAPI
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/MimecastSEG/Analytic Rules/MimecastSIEM_AV.yaml
Version	1.0.1
Arm template	0f0dc725-29dc-48c3-bf10-bd2f34fd1cbb.json

KQL

MimecastSIEM_CL| where mimecastEventId_s=="mail_av"

YAML

relevantTechniques:
- T1053
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - columnName: Sender_s
    identifier: Sender
  - columnName: Recipient_s
    identifier: Recipient
  - columnName: Subject_s
    identifier: Subject
suppressionEnabled: false
version: 1.0.1
enabled: true
id: 0f0dc725-29dc-48c3-bf10-bd2f34fd1cbb
suppressionDuration: 5h
severity: Informational
kind: Scheduled
queryFrequency: 5m
description: Detects threats from email anti virus scan
requiredDataConnectors:
- connectorId: MimecastSIEMAPI
  dataTypes:
  - MimecastSIEM_CL
eventGroupingSettings:
  aggregationKind: SingleAlert
triggerOperator: gt
name: Mimecast Secure Email Gateway - AV
tactics:
- Execution
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_AV.yaml
triggerThreshold: 0
queryPeriod: 15m
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_av"
customDetails:
  fileMime: fileMime_s
  MimecastIP: MimecastIP_s
  SenderDomainInternal: SenderDomainInternal_s
  MsgId_s: MsgId_s
  Size: Size_s
  IP: IP_s
  SenderDomain: SenderDomain_s
  fileName: fileName_s
  md5: md5_g
  Route: Route_s
  fileExt: fileExt_s
  Virus: Virus_s
  CustomerIP: CustomerIP_s
  sha256: sha256_s
  sha1: sha1_s
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: 1d
    enabled: true
    reopenClosedIncident: false
    matchingMethod: AllEntities

ARM