Detection rules › Kusto
Mimecast Secure Email Gateway - Attachment Protect
Detect threat for mail attachment under the targeted threat protection
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1566 Phishing |
| Collection | T1114 Email Collection |
| Initial Access | T0865 Spearphishing Attachment |
Rule body kusto
id: 72264f4f-61fb-4f4f-96c4-635571a376c2
name: Mimecast Secure Email Gateway - Attachment Protect
description: Detect threat for mail attachment under the targeted threat protection
severity: High
requiredDataConnectors:
- connectorId: MimecastSIEMAPI
dataTypes:
- MimecastSIEM_CL
enabled: true
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_attachment"
queryFrequency: 5m
queryPeriod: 15m
triggerOperator: gt
triggerThreshold: 0
suppressionDuration: 5h
suppressionEnabled: false
tactics:
- Collection
- Exfiltration
- Discovery
- InitialAccess
- Execution
relevantTechniques:
- T1114
- T1566
- T0865
incidentConfiguration:
createIncident: true
groupingConfiguration:
enabled: true
reopenClosedIncident: false
lookbackDuration: 1d
matchingMethod: AllEntities
eventGroupingSettings:
aggregationKind: SingleAlert
customDetails:
sha256: sha256_s
fileName: fileName_s
MsgId_s: MsgId_s
entityMappings:
- entityType: MailMessage
fieldMappings:
- identifier: Sender
columnName: Sender_s
- identifier: Recipient
columnName: Recipient_s
- identifier: Subject
columnName: Subject_s
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IP_s
version: 1.0.1
kind: Scheduled
Stages and Predicates
Stage 1: source
MimecastSIEM_CL
Stage 2: where
| where mimecastEventId_s=="mail_ttp_attachment"
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.
| Field | Kind | Values |
|---|---|---|
mimecastEventId_s | eq |
|