let u_cat = dynamic(['Unclassified']);
CiscoSEGEvent
| where NetworkDirection =~ 'Incoming'
| where tostring(AdditionalFields) has 'ESAURLDetails'
| extend link_cat = extract(@"'Category': '(.*?)'", 1, tostring(AdditionalFields))
| where link_cat in~ (u_cat)
| extend AccountCustomEntity = DstUserName
severity: Medium
id: 9cb4a02d-3708-42ba-b33b-0fdd360ce4b6
queryFrequency: 1h
queryPeriod: 1h
relevantTechniques:
- T1566
triggerOperator: gt
status: Available
tactics:
- InitialAccess
kind: Scheduled
description: |
'Detects mails with suspicious links.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoSEG/Analytic Rules/CiscoSEGUnclassifiedLink.yaml
requiredDataConnectors:
- dataTypes:
- CommonSecurityLog
connectorId: CefAma
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountCustomEntity
identifier: Name
query: |
let u_cat = dynamic(['Unclassified']);
CiscoSEGEvent
| where NetworkDirection =~ 'Incoming'
| where tostring(AdditionalFields) has 'ESAURLDetails'
| extend link_cat = extract(@"'Category': '(.*?)'", 1, tostring(AdditionalFields))
| where link_cat in~ (u_cat)
| extend AccountCustomEntity = DstUserName
version: 1.0.3
name: Cisco SEG - Unexpected link
triggerThreshold: 0
{
"$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/9cb4a02d-3708-42ba-b33b-0fdd360ce4b6')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9cb4a02d-3708-42ba-b33b-0fdd360ce4b6')]",
"properties": {
"alertRuleTemplateName": "9cb4a02d-3708-42ba-b33b-0fdd360ce4b6",
"customDetails": null,
"description": "'Detects mails with suspicious links.'\n",
"displayName": "Cisco SEG - Unexpected link",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "Name"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoSEG/Analytic Rules/CiscoSEGUnclassifiedLink.yaml",
"query": "let u_cat = dynamic(['Unclassified']);\nCiscoSEGEvent\n| where NetworkDirection =~ 'Incoming'\n| where tostring(AdditionalFields) has 'ESAURLDetails'\n| extend link_cat = extract(@\"'Category': '(.*?)'\", 1, tostring(AdditionalFields))\n| where link_cat in~ (u_cat)\n| extend AccountCustomEntity = DstUserName\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1566"
],
"templateVersion": "1.0.3",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}