Cisco SEG - Possible outbreak

Back


Id	53242559-95ea-4d4c-b003-107e8f06304b
Rulename	Cisco SEG - Possible outbreak
Description	Detects possible outbreak activity.
Severity	Medium
Tactics	InitialAccess
Techniques	T1566
Required data connectors	CiscoSEG CiscoSEGAma
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/CiscoSEG/Analytic Rules/CiscoSEGPossibleOutbreak.yaml
Version	1.0.1
Arm template	53242559-95ea-4d4c-b003-107e8f06304b.json

KQL

CiscoSEGEvent
| where NetworkDirection =~ 'Incoming'
| where tostring(AdditionalFields) has 'ESAOFVerdict'
| extend of_verdict = extract(@'ESAOFVerdict":"(NOT_EVALUATED|POSITIVE|NEGATIVE)"', 1, tostring(AdditionalFields))
| where of_verdict =~ 'POSITIVE'
| extend AccountCustomEntity = DstUserName

YAML

severity: Medium
name: Cisco SEG - Possible outbreak
requiredDataConnectors:
- dataTypes:
  - CiscoSEGEvent
  connectorId: CiscoSEG
- dataTypes:
  - CiscoSEGEvent
  connectorId: CiscoSEGAma
id: 53242559-95ea-4d4c-b003-107e8f06304b
tactics:
- InitialAccess
queryFrequency: 1h
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoSEG/Analytic Rules/CiscoSEGPossibleOutbreak.yaml
description: |
    'Detects possible outbreak activity.'
triggerThreshold: 0
kind: Scheduled
relevantTechniques:
- T1566
query: |
  CiscoSEGEvent
  | where NetworkDirection =~ 'Incoming'
  | where tostring(AdditionalFields) has 'ESAOFVerdict'
  | extend of_verdict = extract(@'ESAOFVerdict":"(NOT_EVALUATED|POSITIVE|NEGATIVE)"', 1, tostring(AdditionalFields))
  | where of_verdict =~ 'POSITIVE'
  | extend AccountCustomEntity = DstUserName  
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
status: Available
version: 1.0.1
queryPeriod: 1h

ARM

{
  "$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/53242559-95ea-4d4c-b003-107e8f06304b')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/53242559-95ea-4d4c-b003-107e8f06304b')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Cisco SEG - Possible outbreak",
        "description": "'Detects possible outbreak activity.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "CiscoSEGEvent\n| where NetworkDirection =~ 'Incoming'\n| where tostring(AdditionalFields) has 'ESAOFVerdict'\n| extend of_verdict = extract(@'ESAOFVerdict\":\"(NOT_EVALUATED|POSITIVE|NEGATIVE)\"', 1, tostring(AdditionalFields))\n| where of_verdict =~ 'POSITIVE'\n| extend AccountCustomEntity = DstUserName\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "alertRuleTemplateName": "53242559-95ea-4d4c-b003-107e8f06304b",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Name",
                "columnName": "AccountCustomEntity"
              }
            ],
            "entityType": "Account"
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoSEG/Analytic Rules/CiscoSEGPossibleOutbreak.yaml"
      }
    }
  ]
}