Detection rules › Kusto

Mimecast Secure Email Gateway - AV

Severity
informational
Time window
15m
Source
github.com/Azure/Azure-Sentinel

Detects threats from email anti virus scan

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1053 Scheduled Task/Job

Rule body kusto

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

Stages and Predicates

Stage 1: source

MimecastSIEM_CL

Stage 2: where

| where mimecastEventId_s=="mail_av"

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
mimecastEventId_seq
  • mail_av transforms: cased