Digital Guardian - Exfiltration to private email
Id | edead9b5-243a-466b-ae78-2dae32ab1117 |
Rulename | Digital Guardian - Exfiltration to private email |
Description | Detects exfiltration to private email. |
Severity | High |
Tactics | Exfiltration |
Techniques | T1048 |
Required data connectors | DigitalGuardianDLP SyslogAma |
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/Digital Guardian Data Loss Prevention/Analytic Rules/DigitalGuardianFileSentToExternal.yaml |
Version | 1.0.1 |
Arm template | edead9b5-243a-466b-ae78-2dae32ab1117.json |
DigitalGuardianDLPEvent
| where NetworkApplicationProtocol =~ 'SMTP'
| where isnotempty(inspected_document)
| extend s_user = substring(SrcUserName, 0, indexof(SrcUserName, '@'))
| extend d_user = substring(DstUserName, 0, indexof(DstUserName, '@'))
| extend s_domain = extract(@'@(.*)', 1, SrcUserName)
| extend d_domain = extract(@'@(.*)', 1, DstUserName)
| where s_domain != d_domain
| where s_user == d_user
| extend AccountCustomEntity = SrcUserName
queryPeriod: 1h
version: 1.0.1
tactics:
- Exfiltration
queryFrequency: 1h
id: edead9b5-243a-466b-ae78-2dae32ab1117
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
- DigitalGuardianDLPEvent
connectorId: DigitalGuardianDLP
- datatypes:
- Syslog
connectorId: SyslogAma
severity: High
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountCustomEntity
identifier: Name
triggerThreshold: 0
relevantTechniques:
- T1048
query: |
DigitalGuardianDLPEvent
| where NetworkApplicationProtocol =~ 'SMTP'
| where isnotempty(inspected_document)
| extend s_user = substring(SrcUserName, 0, indexof(SrcUserName, '@'))
| extend d_user = substring(DstUserName, 0, indexof(DstUserName, '@'))
| extend s_domain = extract(@'@(.*)', 1, SrcUserName)
| extend d_domain = extract(@'@(.*)', 1, DstUserName)
| where s_domain != d_domain
| where s_user == d_user
| extend AccountCustomEntity = SrcUserName
kind: Scheduled
name: Digital Guardian - Exfiltration to private email
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Digital Guardian Data Loss Prevention/Analytic Rules/DigitalGuardianFileSentToExternal.yaml
description: |
'Detects exfiltration to private email.'
status: Available
{
"$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/edead9b5-243a-466b-ae78-2dae32ab1117')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/edead9b5-243a-466b-ae78-2dae32ab1117')]",
"properties": {
"alertRuleTemplateName": "edead9b5-243a-466b-ae78-2dae32ab1117",
"customDetails": null,
"description": "'Detects exfiltration to private email.'\n",
"displayName": "Digital Guardian - Exfiltration to private email",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "Name"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Digital Guardian Data Loss Prevention/Analytic Rules/DigitalGuardianFileSentToExternal.yaml",
"query": "DigitalGuardianDLPEvent\n| where NetworkApplicationProtocol =~ 'SMTP'\n| where isnotempty(inspected_document)\n| extend s_user = substring(SrcUserName, 0, indexof(SrcUserName, '@'))\n| extend d_user = substring(DstUserName, 0, indexof(DstUserName, '@'))\n| extend s_domain = extract(@'@(.*)', 1, SrcUserName)\n| extend d_domain = extract(@'@(.*)', 1, DstUserName)\n| where s_domain != d_domain\n| where s_user == d_user\n| extend AccountCustomEntity = SrcUserName\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "High",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Exfiltration"
],
"techniques": [
"T1048"
],
"templateVersion": "1.0.1",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}