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

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

ARM