Detection rules › Kusto
Recorded Future Sandbox - Malicious Email Attachment
'Creates incidents when Recorded Future Sandbox detects malicious files from Outlook email attachments'
Rule body
id: a1b2c3d4-5678-90ab-cdef-222222222222
name: Recorded Future Sandbox - Malicious Email Attachment
description: |
'Creates incidents when Recorded Future Sandbox detects malicious files from Outlook email attachments'
severity: High
status: Available
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics: []
relevantTechniques: []
query: |
RecordedFutureSandboxResults_CL
| where TimeGenerated >= now(-1h)
| where Source_s == "OutlookAttachment"
| where toint(SandboxScore_s) >= 50
eventGroupingSettings:
aggregationKind: AlertPerResult
alertDetailsOverride:
alertDisplayNameFormat: 'Malicious Email Attachment: {{FileName_s}} from {{EmailFrom_s}}'
alertDescriptionFormat: |
_Recorded Future Sandbox - Malicious Email Attachment Detected_
**Sandbox Score:** {{SandboxScore_s}}/100
**Verdict:** {{SandboxVerdict_s}}
**Sample ID:** {{SampleId_s}}
A malicious file was detected in an email attachment. Review the full sandbox report and investigate the sender.
customDetails:
RFLabel: SourceSystem
Source: Source_s
SandboxScore: SandboxScore_s
SandboxVerdict: SandboxVerdict_s
FileName: FileName_s
SampleId: SampleId_s
EmailFrom: EmailFrom_s
EmailTo: EmailTo_s
entityMappings:
- entityType: File
fieldMappings:
- identifier: Name
columnName: FileName_s
- entityType: Mailbox
fieldMappings:
- identifier: MailboxPrimaryAddress
columnName: EmailFrom_s
incidentConfiguration:
createIncident: true
groupingConfiguration:
enabled: true
reopenClosedIncident: false
lookbackDuration: 1h
matchingMethod: Selected
groupByCustomDetails:
- EmailFrom
version: 1.0.0
kind: NRT
Stages and Predicates
Stage 1: source
RecordedFutureSandboxResults_CL
Stage 2: where
| where TimeGenerated >= now(-1h)
Stage 3: where
| where Source_s == "OutlookAttachment"
Stage 4: where
| where toint(SandboxScore_s) >= 50
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
SandboxScore_s | ge |
| field:"SandboxScore_s" kind:ge value:"50" |
Source_s | eq |
| field:"Source_s" kind:eq value:"OutlookAttachment" |