Mimecast Targeted Threat Protection - URL Protect

Status: available
Severity: high
Time window: 30m
Source: github.com/Azure/Azure-Sentinel

'Detects malicious scan results and actions which are not allowed.'

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T0865` Spearphishing Attachment

Rule body

id: 952faed4-c6a6-4873-aeb9-b348e9ce5aba
name: Mimecast Targeted Threat Protection - URL Protect
description: |
  'Detects malicious scan results and actions which are not allowed.'
severity: High
status: Available
requiredDataConnectors:
  - connectorId: MimecastTTPAPI
    dataTypes:
      - MimecastTTPUrl
queryFrequency: 30m
queryPeriod: 30m
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
- Discovery
relevantTechniques:
- T0865
query: |
  MimecastTTPUrl
  | where ['Scan Result'] == "malicious" and Action != "allow"
  | extend  From_User_EmailAddress = ['From User Email Address'],MessageID = ['Message ID'] , User_EmailAddress = ['User Email Address'], SendingIP = ['Sending IP']
suppressionDuration: 5h
suppressionEnabled: false
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: P7D
    matchingMethod: AllEntities
eventGroupingSettings:
  aggregationKind: AlertPerResult
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SendingIP
  - entityType: MailMessage
    fieldMappings:
      - identifier: Sender
        columnName: From_User_EmailAddress
      - identifier: InternetMessageId
        columnName: MessageID
      - identifier: Recipient
        columnName: User_EmailAddress
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: Url
version: 1.0.1
kind: Scheduled

Stages and Predicates

Stage 1: `source`

MimecastTTPUrl

Stage 2: `where`

| where ['Scan Result'] == "malicious" and Action != "allow"

Stage 3: `extend`

| extend  From_User_EmailAddress = ['From User Email Address'],MessageID = ['Message ID'] , User_EmailAddress = ['User Email Address'], SendingIP = ['Sending IP']

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Action`	ne	`allow`	`field:"Action" kind:ne value:"allow"`
`Scan Result`	eq	`malicious`	`field:"Scan Result" kind:eq value:"malicious"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`From_User_EmailAddress`	`extend`
`MessageID`	`extend`
`SendingIP`	`extend`
`User_EmailAddress`	`extend`

Mimecast Targeted Threat Protection - URL Protect

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`