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Vectra AI Detect - Suspicious Behaviors

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Id6cb75f65-231f-46c4-a0b3-50ff21ee6ed3
RulenameVectra AI Detect - Suspicious Behaviors
DescriptionCreate an incident for each new malicious behavior detected by Vectra Detect.

By default, it looks through all tactics. This can be modified to create incident only for a subset of tactics.
SeverityMedium
TacticsCredentialAccess
Discovery
LateralMovement
Collection
CommandAndControl
Exfiltration
Impact
Required data connectorsAIVectraDetect
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vectra AI Detect/Analytic Rules/VectraDetect-Suspected-Behavior-by-Tactics.yaml
Version1.0.5
Arm template6cb75f65-231f-46c4-a0b3-50ff21ee6ed3.json
Deploy To Azure
// Edit this variable to only keep the tactics where an incident needs to be created (Defaults are: "COMMAND & CONTROL", "BOTNET ACTIVITY", "EXFILTRATION", "LATERAL MOVEMENT", "RECONNAISSANCE")   
let configured_tactics = dynamic(["COMMAND & CONTROL", "BOTNET ACTIVITY", "EXFILTRATION", "LATERAL MOVEMENT", "RECONNAISSANCE"]);
CommonSecurityLog
| where DeviceVendor == "Vectra Networks"
| where DeviceProduct == "X Series"
| where DeviceEventClassID != "campaigns" and DeviceEventClassID != "hsc" and DeviceEventClassID != "audit" and DeviceEventClassID != "health" and DeviceEventClassID != "asc" 
| extend Category = coalesce(
                          column_ifexists("DeviceEventCategory", ""), 
                          extract("cat=(.+?)(;|$)", 1, AdditionalExtensions), 
                          ""
                      )
| project-rename threat_score = FlexNumber1
| project-rename certainty_score = FlexNumber2
| project-rename triaged = DeviceCustomString5
| project-rename vectra_URL = DeviceCustomString4
| project-rename detection_name = DeviceEventClassID
| extend Tactic = case( Category == "COMMAND & CONTROL", "CommandAndControl",
                        Category == "BOTNET ACTIVITY" , "Impact",
                        Category == "EXFILTRATION", "Exfiltration",
                        Category == "LATERAL MOVEMENT", "LateralMovement",
                        Category == "RECONNAISSANCE", "Discovery",
                        "UNKNOWN")
| extend level = case( threat_score <  50 and certainty_score < 50, "Low",
                       threat_score < 50 and certainty_score >= 50 , "Medium", 
                       threat_score >= 50 and certainty_score <= 50, "High", 
                       threat_score >= 50 and certainty_score >= 50, "Critical",
                       "UNKNOWN")
| extend Severity = case( level == "Low", "Low",
                          level == "Medium", "Medium",
                          level == "High", "Medium",
                          level == "Critical", "High",
                          "UNKNOWN")
| extend account = extract("account=(.+?);", 1, AdditionalExtensions)
| extend upn = iff(account matches regex ":", tostring(split(account,":")[1]) ,tostring(split(account,":")[0])) 
| extend source_entity = case( isnotempty(upn), upn,
                               isnotempty(SourceHostName), SourceHostName,
                               "UNKNWON") 
| where Category in (configured_tactics) 
| summarize arg_max(threat_score, *) by source_entity , Activity
| project  TimeGenerated, source_entity, SourceHostName, SourceIP, upn, Activity, Tactic, Severity, threat_score, certainty_score, triaged, vectra_URL
| extend AccountCustomEntity = upn, HostCustomEntity = SourceHostName, IPCustomEntity = SourceIP, timestamp = TimeGenerated
severity: Medium
triggerThreshold: 0
query: |
  // Edit this variable to only keep the tactics where an incident needs to be created (Defaults are: "COMMAND & CONTROL", "BOTNET ACTIVITY", "EXFILTRATION", "LATERAL MOVEMENT", "RECONNAISSANCE")   
  let configured_tactics = dynamic(["COMMAND & CONTROL", "BOTNET ACTIVITY", "EXFILTRATION", "LATERAL MOVEMENT", "RECONNAISSANCE"]);
  CommonSecurityLog
  | where DeviceVendor == "Vectra Networks"
  | where DeviceProduct == "X Series"
  | where DeviceEventClassID != "campaigns" and DeviceEventClassID != "hsc" and DeviceEventClassID != "audit" and DeviceEventClassID != "health" and DeviceEventClassID != "asc" 
  | extend Category = coalesce(
                            column_ifexists("DeviceEventCategory", ""), 
                            extract("cat=(.+?)(;|$)", 1, AdditionalExtensions), 
                            ""
                        )
  | project-rename threat_score = FlexNumber1
  | project-rename certainty_score = FlexNumber2
  | project-rename triaged = DeviceCustomString5
  | project-rename vectra_URL = DeviceCustomString4
  | project-rename detection_name = DeviceEventClassID
  | extend Tactic = case( Category == "COMMAND & CONTROL", "CommandAndControl",
                          Category == "BOTNET ACTIVITY" , "Impact",
                          Category == "EXFILTRATION", "Exfiltration",
                          Category == "LATERAL MOVEMENT", "LateralMovement",
                          Category == "RECONNAISSANCE", "Discovery",
                          "UNKNOWN")
  | extend level = case( threat_score <  50 and certainty_score < 50, "Low",
                         threat_score < 50 and certainty_score >= 50 , "Medium", 
                         threat_score >= 50 and certainty_score <= 50, "High", 
                         threat_score >= 50 and certainty_score >= 50, "Critical",
                         "UNKNOWN")
  | extend Severity = case( level == "Low", "Low",
                            level == "Medium", "Medium",
                            level == "High", "Medium",
                            level == "Critical", "High",
                            "UNKNOWN")
  | extend account = extract("account=(.+?);", 1, AdditionalExtensions)
  | extend upn = iff(account matches regex ":", tostring(split(account,":")[1]) ,tostring(split(account,":")[0])) 
  | extend source_entity = case( isnotempty(upn), upn,
                                 isnotempty(SourceHostName), SourceHostName,
                                 "UNKNWON") 
  | where Category in (configured_tactics) 
  | summarize arg_max(threat_score, *) by source_entity , Activity
  | project  TimeGenerated, source_entity, SourceHostName, SourceIP, upn, Activity, Tactic, Severity, threat_score, certainty_score, triaged, vectra_URL
  | extend AccountCustomEntity = upn, HostCustomEntity = SourceHostName, IPCustomEntity = SourceIP, timestamp = TimeGenerated  
queryFrequency: 1h
requiredDataConnectors:
- connectorId: AIVectraDetect
  dataTypes:
  - CommonSecurityLog
id: 6cb75f65-231f-46c4-a0b3-50ff21ee6ed3
version: 1.0.5
name: Vectra AI Detect - Suspicious Behaviors
kind: Scheduled
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vectra AI Detect/Analytic Rules/VectraDetect-Suspected-Behavior-by-Tactics.yaml
queryPeriod: 1h
relevantTechniques: 
triggerOperator: gt
tactics:
- CredentialAccess
- Discovery
- LateralMovement
- Collection
- CommandAndControl
- Exfiltration
- Impact
alertDetailsOverride:
  alertSeverityColumnName: Severity
  alertDescriptionFormat: Malicious behavior {{Activity}} has been detected for {{source_entity}}. Pivot to the detection in Detect UI with {{vectra_URL}}
  alertTacticsColumnName: Tactic
  alertDisplayNameFormat: Vectra AI Detect - {{Activity}} detected for {{source_entity}}
description: |
  'Create an incident for each new malicious behavior detected by Vectra Detect. 
  By default, it looks through all tactics. This can be modified to create incident only for a subset of tactics.'  
entityMappings:
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: HostCustomEntity
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/6cb75f65-231f-46c4-a0b3-50ff21ee6ed3')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/6cb75f65-231f-46c4-a0b3-50ff21ee6ed3')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Vectra AI Detect - Suspicious Behaviors",
        "description": "'Create an incident for each new malicious behavior detected by Vectra Detect. \nBy default, it looks through all tactics. This can be modified to create incident only for a subset of tactics.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "// Edit this variable to only keep the tactics where an incident needs to be created (Defaults are: \"COMMAND & CONTROL\", \"BOTNET ACTIVITY\", \"EXFILTRATION\", \"LATERAL MOVEMENT\", \"RECONNAISSANCE\")   \nlet configured_tactics = dynamic([\"COMMAND & CONTROL\", \"BOTNET ACTIVITY\", \"EXFILTRATION\", \"LATERAL MOVEMENT\", \"RECONNAISSANCE\"]);\nCommonSecurityLog\n| where DeviceVendor == \"Vectra Networks\"\n| where DeviceProduct == \"X Series\"\n| where DeviceEventClassID != \"campaigns\" and DeviceEventClassID != \"hsc\" and DeviceEventClassID != \"audit\" and DeviceEventClassID != \"health\" and DeviceEventClassID != \"asc\" \n| extend Category = coalesce(\n                          column_ifexists(\"DeviceEventCategory\", \"\"), \n                          extract(\"cat=(.+?)(;|$)\", 1, AdditionalExtensions), \n                          \"\"\n                      )\n| project-rename threat_score = FlexNumber1\n| project-rename certainty_score = FlexNumber2\n| project-rename triaged = DeviceCustomString5\n| project-rename vectra_URL = DeviceCustomString4\n| project-rename detection_name = DeviceEventClassID\n| extend Tactic = case( Category == \"COMMAND & CONTROL\", \"CommandAndControl\",\n                        Category == \"BOTNET ACTIVITY\" , \"Impact\",\n                        Category == \"EXFILTRATION\", \"Exfiltration\",\n                        Category == \"LATERAL MOVEMENT\", \"LateralMovement\",\n                        Category == \"RECONNAISSANCE\", \"Discovery\",\n                        \"UNKNOWN\")\n| extend level = case( threat_score <  50 and certainty_score < 50, \"Low\",\n                       threat_score < 50 and certainty_score >= 50 , \"Medium\", \n                       threat_score >= 50 and certainty_score <= 50, \"High\", \n                       threat_score >= 50 and certainty_score >= 50, \"Critical\",\n                       \"UNKNOWN\")\n| extend Severity = case( level == \"Low\", \"Low\",\n                          level == \"Medium\", \"Medium\",\n                          level == \"High\", \"Medium\",\n                          level == \"Critical\", \"High\",\n                          \"UNKNOWN\")\n| extend account = extract(\"account=(.+?);\", 1, AdditionalExtensions)\n| extend upn = iff(account matches regex \":\", tostring(split(account,\":\")[1]) ,tostring(split(account,\":\")[0])) \n| extend source_entity = case( isnotempty(upn), upn,\n                               isnotempty(SourceHostName), SourceHostName,\n                               \"UNKNWON\") \n| where Category in (configured_tactics) \n| summarize arg_max(threat_score, *) by source_entity , Activity\n| project  TimeGenerated, source_entity, SourceHostName, SourceIP, upn, Activity, Tactic, Severity, threat_score, certainty_score, triaged, vectra_URL\n| extend AccountCustomEntity = upn, HostCustomEntity = SourceHostName, IPCustomEntity = SourceIP, timestamp = TimeGenerated\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "Discovery",
          "LateralMovement",
          "Collection",
          "CommandAndControl",
          "Exfiltration",
          "Impact"
        ],
        "techniques": null,
        "alertRuleTemplateName": "6cb75f65-231f-46c4-a0b3-50ff21ee6ed3",
        "alertDetailsOverride": {
          "alertDisplayNameFormat": "Vectra AI Detect - {{Activity}} detected for {{source_entity}}",
          "alertSeverityColumnName": "Severity",
          "alertTacticsColumnName": "Tactic",
          "alertDescriptionFormat": "Malicious behavior {{Activity}} has been detected for {{source_entity}}. Pivot to the detection in Detect UI with {{vectra_URL}}"
        },
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "HostCustomEntity",
                "identifier": "HostName"
              }
            ],
            "entityType": "Host"
          },
          {
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          },
          {
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ],
            "entityType": "Account"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vectra AI Detect/Analytic Rules/VectraDetect-Suspected-Behavior-by-Tactics.yaml",
        "templateVersion": "1.0.5",
        "status": "Available"
      }
    }
  ]
}