VTI - High Severity SHA1 Collision Detection

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Id	dbd9e28f-973d-47f3-a8c3-9e18da846870
Rulename	VTI - High Severity SHA1 Collision Detection
Description	This will alert when a collision is detected for DeviceFileEvents events with VTI high severity SHA1 IoCs
Severity	High
Tactics	Execution
Techniques	T1204
Required data connectors	VisaThreatIntelligence
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Visa Threat Intelligence (VTI)/Analytic Rules/VTIP_high_severity_sha1.yaml
Version	1.0.0
Arm template	dbd9e28f-973d-47f3-a8c3-9e18da846870.json

KQL

DeviceFileEvents
| join kind=inner (VisaThreatIntelligenceIOC_CL  | where IOCType == "sha1" and SourceSeverity == "High")
on $left.InitiatingProcessSHA1 == $right.Value

YAML

description: This will alert when a collision is detected for DeviceFileEvents events with VTI high severity SHA1 IoCs
tactics:
- Execution
suppressionEnabled: false
suppressionDuration: 1h
requiredDataConnectors:
- dataTypes:
  - VisaThreatIntelligenceIOC_CL
  - DeviceFileEvents
  connectorId: VisaThreatIntelligence
incidentConfiguration:
  groupingConfiguration:
    enabled: true
    lookbackDuration: 1h
    reopenClosedIncident: false
    matchingMethod: AllEntities
  createIncident: true
id: dbd9e28f-973d-47f3-a8c3-9e18da846870
severity: High
eventGroupingSettings:
  aggregationKind: SingleAlert
query: |-
  DeviceFileEvents
  | join kind=inner (VisaThreatIntelligenceIOC_CL  | where IOCType == "sha1" and SourceSeverity == "High")
  on $left.InitiatingProcessSHA1 == $right.Value  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Visa Threat Intelligence (VTI)/Analytic Rules/VTIP_high_severity_sha1.yaml
kind: Scheduled
queryPeriod: 1h
name: VTI - High Severity SHA1 Collision Detection
queryFrequency: 1h
triggerThreshold: 0
relevantTechniques:
- T1204
version: 1.0.0
entityMappings:
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: DeviceName
- entityType: FileHash
  fieldMappings:
  - identifier: Algorithm
    columnName: SHA1
  - identifier: Value
    columnName: InitiatingProcessSHA1
triggerOperator: gt

ARM