CiscoSEGEvent
| where NetworkDirection =~ 'Incoming'
| where SimplifiedDeviceAction =~ 'DELIVERED'
| where tostring(AdditionalFields) has 'ESAAMPVerdict'
| extend amp_verdict = extract(@'ESAAMPVerdict":"(NOT_EVALUATED|CLEAN|FA_PENDING|UNKNOWN|SKIPPED|UNSCANNABLE|LOW_RISK|MALICIOUS)"', 1, tostring(AdditionalFields))
| where amp_verdict =~ 'MALICIOUS'
| extend AccountCustomEntity = DstUserName
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: AccountCustomEntity
queryFrequency: 10m
name: Cisco SEG - Malicious attachment not blocked
kind: Scheduled
tactics:
- InitialAccess
triggerThreshold: 0
query: |
CiscoSEGEvent
| where NetworkDirection =~ 'Incoming'
| where SimplifiedDeviceAction =~ 'DELIVERED'
| where tostring(AdditionalFields) has 'ESAAMPVerdict'
| extend amp_verdict = extract(@'ESAAMPVerdict":"(NOT_EVALUATED|CLEAN|FA_PENDING|UNKNOWN|SKIPPED|UNSCANNABLE|LOW_RISK|MALICIOUS)"', 1, tostring(AdditionalFields))
| where amp_verdict =~ 'MALICIOUS'
| extend AccountCustomEntity = DstUserName
relevantTechniques:
- T1566
triggerOperator: gt
queryPeriod: 10m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoSEG/Analytic Rules/CiscoSEGMaliciousAttachmentNotBlocked.yaml
severity: High
status: Available
id: 236e872c-31d1-4b45-ac2a-fda3af465c97
requiredDataConnectors:
- connectorId: CefAma
dataTypes:
- CommonSecurityLog
version: 1.0.3
description: |
'Detects mails with malicious attachments which were not blocked.'
{
"$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/236e872c-31d1-4b45-ac2a-fda3af465c97')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/236e872c-31d1-4b45-ac2a-fda3af465c97')]",
"properties": {
"alertRuleTemplateName": "236e872c-31d1-4b45-ac2a-fda3af465c97",
"customDetails": null,
"description": "'Detects mails with malicious attachments which were not blocked.'\n",
"displayName": "Cisco SEG - Malicious attachment not blocked",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "Name"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoSEG/Analytic Rules/CiscoSEGMaliciousAttachmentNotBlocked.yaml",
"query": "CiscoSEGEvent\n| where NetworkDirection =~ 'Incoming'\n| where SimplifiedDeviceAction =~ 'DELIVERED'\n| where tostring(AdditionalFields) has 'ESAAMPVerdict'\n| extend amp_verdict = extract(@'ESAAMPVerdict\":\"(NOT_EVALUATED|CLEAN|FA_PENDING|UNKNOWN|SKIPPED|UNSCANNABLE|LOW_RISK|MALICIOUS)\"', 1, tostring(AdditionalFields))\n| where amp_verdict =~ 'MALICIOUS'\n| extend AccountCustomEntity = DstUserName\n",
"queryFrequency": "PT10M",
"queryPeriod": "PT10M",
"severity": "High",
"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"
}
]
}