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

ARM