VTI - High Severity SHA1 Collision Detection

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

incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: 1h
    reopenClosedIncident: false
    enabled: true
    matchingMethod: AllEntities
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: DeviceName
    identifier: HostName
- entityType: FileHash
  fieldMappings:
  - columnName: SHA1
    identifier: Algorithm
  - columnName: InitiatingProcessSHA1
    identifier: Value
query: |-
  DeviceFileEvents
  | join kind=inner (VisaThreatIntelligenceIOC_CL  | where IOCType == "sha1" and SourceSeverity == "High")
  on $left.InitiatingProcessSHA1 == $right.Value
suppressionEnabled: false
id: dbd9e28f-973d-47f3-a8c3-9e18da846870
queryFrequency: 1h
eventGroupingSettings:
  aggregationKind: SingleAlert
suppressionDuration: 1h
severity: High
relevantTechniques:
- T1204
version: 1.0.0
kind: Scheduled
tactics:
- Execution
requiredDataConnectors:
- dataTypes:
  - VisaThreatIntelligenceIOC_CL
  - DeviceFileEvents
  connectorId: VisaThreatIntelligence
description: This will alert when a collision is detected for DeviceFileEvents events with VTI high severity SHA1 IoCs
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Visa%20Threat%20Intelligence%20%28VTI%29/Analytic%20Rules/VTIP_high_severity_sha1.yaml
triggerOperator: gt
name: VTI - High Severity SHA1 Collision Detection
triggerThreshold: 0
queryPeriod: 1h

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/dbd9e28f-973d-47f3-a8c3-9e18da846870')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/dbd9e28f-973d-47f3-a8c3-9e18da846870')]",
      "properties": {
        "alertRuleTemplateName": "dbd9e28f-973d-47f3-a8c3-9e18da846870",
        "customDetails": null,
        "description": "This will alert when a collision is detected for DeviceFileEvents events with VTI high severity SHA1 IoCs",
        "displayName": "VTI - High Severity SHA1 Collision Detection",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "FileHash",
            "fieldMappings": [
              {
                "columnName": "SHA1",
                "identifier": "Algorithm"
              },
              {
                "columnName": "InitiatingProcessSHA1",
                "identifier": "Value"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "PT1H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Visa%20Threat%20Intelligence%20%28VTI%29/Analytic%20Rules/VTIP_high_severity_sha1.yaml",
        "query": "DeviceFileEvents\n| join kind=inner (VisaThreatIntelligenceIOC_CL  | where IOCType == \"sha1\" and SourceSeverity == \"High\")\non $left.InitiatingProcessSHA1 == $right.Value",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution"
        ],
        "techniques": [
          "T1204"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}