Detect threat information in web requests (ASIM Web Session)

let lookback= 5m;
_Im_WebSession(starttime=ago(lookback))
| project
    EventSeverity,
    ThreatName,
    ThreatCategory,
    ThreatRiskLevel,
    ThreatOriginalConfidence,
    ThreatField,
    TimeGenerated,
    SrcIpAddr,
    SrcUsername,
    SrcHostname,
    Url,
    DstIpAddr
| where ThreatRiskLevel >= 90
    or toint(ThreatOriginalConfidence) >= 90
    or EventSeverity =~ "High"
| summarize
    EventCount = count(),
    EventStartTime=min(TimeGenerated),
    EvenEndTime=max(TimeGenerated)
    by
    SrcIpAddr,
    SrcUsername,
    SrcHostname,
    Url,
    DstIpAddr,
    ThreatName,
    ThreatCategory,
    ThreatRiskLevel,
    ThreatOriginalConfidence,
    ThreatField
| extend
    Name = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),
    UPNSuffix = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 1)[0]), "")

tags:
- Schema: WebSession
  SchemaVersion: 0.2.6
customDetails:
  ThreatCategory: ThreatCategory
  EventCount: EventCount
  ThreatConfidence: ThreatOriginalConfidence
  EvenEndTime: EvenEndTime
  EventStartTime: EventStartTime
  ThreatName: ThreatName
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Web Session Essentials/Analytic Rules/ThreatInfoFoundInWebRequests.yaml
requiredDataConnectors: []
alertDetailsOverride:
  alertDisplayNameFormat: User '{{SrcUsername}}' with IP address '{{SrcIpAddr}}' has been identified as being associated with a threat named '{{ThreatName}}'
id: 7d2ed1c7-da26-45fd-b4ea-b6f2bbeccea7
tactics:
- InitialAccess
queryFrequency: 5m
eventGroupingSettings:
  aggregationKind: AlertPerResult
triggerOperator: gt
relevantTechniques:
- T1190
- T1133
description: |
    'This rule would generate an alert if EvenSeverity is 'High' or 'ThreatRiskLevel' or 'ThreatOriginalConfidence' value is greater than 90.
triggerThreshold: 0
kind: Scheduled
name: Detect threat information in web requests (ASIM Web Session)
query: |
  let lookback= 5m;
  _Im_WebSession(starttime=ago(lookback))
  | project
      EventSeverity,
      ThreatName,
      ThreatCategory,
      ThreatRiskLevel,
      ThreatOriginalConfidence,
      ThreatField,
      TimeGenerated,
      SrcIpAddr,
      SrcUsername,
      SrcHostname,
      Url,
      DstIpAddr
  | where ThreatRiskLevel >= 90
      or toint(ThreatOriginalConfidence) >= 90
      or EventSeverity =~ "High"
  | summarize
      EventCount = count(),
      EventStartTime=min(TimeGenerated),
      EvenEndTime=max(TimeGenerated)
      by
      SrcIpAddr,
      SrcUsername,
      SrcHostname,
      Url,
      DstIpAddr,
      ThreatName,
      ThreatCategory,
      ThreatRiskLevel,
      ThreatOriginalConfidence,
      ThreatField
  | extend
      Name = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),
      UPNSuffix = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 1)[0]), "")  
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: SrcHostname
    identifier: HostName
- entityType: IP
  fieldMappings:
  - columnName: SrcIpAddr
    identifier: Address
- entityType: IP
  fieldMappings:
  - columnName: DstIpAddr
    identifier: Address
- entityType: Account
  fieldMappings:
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
- entityType: URL
  fieldMappings:
  - columnName: Url
    identifier: Url
status: Available
severity: High
version: 1.0.0
queryPeriod: 5m

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/7d2ed1c7-da26-45fd-b4ea-b6f2bbeccea7')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/7d2ed1c7-da26-45fd-b4ea-b6f2bbeccea7')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Detect threat information in web requests (ASIM Web Session)",
        "description": "'This rule would generate an alert if EvenSeverity is 'High' or 'ThreatRiskLevel' or 'ThreatOriginalConfidence' value is greater than 90.\n",
        "severity": "High",
        "enabled": true,
        "query": "let lookback= 5m;\n_Im_WebSession(starttime=ago(lookback))\n| project\n    EventSeverity,\n    ThreatName,\n    ThreatCategory,\n    ThreatRiskLevel,\n    ThreatOriginalConfidence,\n    ThreatField,\n    TimeGenerated,\n    SrcIpAddr,\n    SrcUsername,\n    SrcHostname,\n    Url,\n    DstIpAddr\n| where ThreatRiskLevel >= 90\n    or toint(ThreatOriginalConfidence) >= 90\n    or EventSeverity =~ \"High\"\n| summarize\n    EventCount = count(),\n    EventStartTime=min(TimeGenerated),\n    EvenEndTime=max(TimeGenerated)\n    by\n    SrcIpAddr,\n    SrcUsername,\n    SrcHostname,\n    Url,\n    DstIpAddr,\n    ThreatName,\n    ThreatCategory,\n    ThreatRiskLevel,\n    ThreatOriginalConfidence,\n    ThreatField\n| extend\n    Name = iif(SrcUsername contains \"@\", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),\n    UPNSuffix = iif(SrcUsername contains \"@\", tostring(split(SrcUsername, '@', 1)[0]), \"\")\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1190",
          "T1133"
        ],
        "alertRuleTemplateName": "7d2ed1c7-da26-45fd-b4ea-b6f2bbeccea7",
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "alertDetailsOverride": {
          "alertDisplayNameFormat": "User '{{SrcUsername}}' with IP address '{{SrcIpAddr}}' has been identified as being associated with a threat named '{{ThreatName}}'"
        },
        "customDetails": {
          "ThreatCategory": "ThreatCategory",
          "EventCount": "EventCount",
          "ThreatConfidence": "ThreatOriginalConfidence",
          "EvenEndTime": "EvenEndTime",
          "EventStartTime": "EventStartTime",
          "ThreatName": "ThreatName"
        },
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "HostName",
                "columnName": "SrcHostname"
              }
            ],
            "entityType": "Host"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "SrcIpAddr"
              }
            ],
            "entityType": "IP"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "DstIpAddr"
              }
            ],
            "entityType": "IP"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Name",
                "columnName": "Name"
              },
              {
                "identifier": "UPNSuffix",
                "columnName": "UPNSuffix"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Url",
                "columnName": "Url"
              }
            ],
            "entityType": "URL"
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.0",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Web Session Essentials/Analytic Rules/ThreatInfoFoundInWebRequests.yaml",
        "tags": [
          {
            "SchemaVersion": "0.2.6",
            "Schema": "WebSession"
          }
        ]
      }
    }
  ]
}