let lbtime = 10m;
let disallowed_ext = dynamic(['ps1', 'exe', 'vbs', 'js', 'scr']);
ProofpointPOD
| where TimeGenerated > ago(lbtime)
| where EventType == 'message'
| where NetworkDirection == 'inbound'
| where FilterDisposition !in ('reject', 'discard')
| extend attachedExt = todynamic(MsgParts)[0]['detectedExt']
| where tolower(attachedExt) in (disallowed_ext)
| project SrcUserUpn, AccountCustomEntity = parse_json(DstUserUpn)[0], attachedExt
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
queryFrequency: 10m
name: ProofpointPOD - Suspicious attachment
kind: Scheduled
tactics:
- InitialAccess
triggerThreshold: 0
query: |
let lbtime = 10m;
let disallowed_ext = dynamic(['ps1', 'exe', 'vbs', 'js', 'scr']);
ProofpointPOD
| where TimeGenerated > ago(lbtime)
| where EventType == 'message'
| where NetworkDirection == 'inbound'
| where FilterDisposition !in ('reject', 'discard')
| extend attachedExt = todynamic(MsgParts)[0]['detectedExt']
| where tolower(attachedExt) in (disallowed_ext)
| project SrcUserUpn, AccountCustomEntity = parse_json(DstUserUpn)[0], attachedExt
relevantTechniques:
- T1566
triggerOperator: gt
queryPeriod: 10m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODSuspiciousAttachment.yaml
severity: Medium
status: Available
id: f6a51e2c-2d6a-4f92-a090-cfb002ca611f
requiredDataConnectors:
- connectorId: ProofpointPOD
dataTypes:
- ProofpointPOD_message_CL
version: 1.0.2
description: |
'Detects when email contains suspicious attachment (file type).'
{
"$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/f6a51e2c-2d6a-4f92-a090-cfb002ca611f')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f6a51e2c-2d6a-4f92-a090-cfb002ca611f')]",
"properties": {
"alertRuleTemplateName": "f6a51e2c-2d6a-4f92-a090-cfb002ca611f",
"customDetails": null,
"description": "'Detects when email contains suspicious attachment (file type).'\n",
"displayName": "ProofpointPOD - Suspicious attachment",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "FullName"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODSuspiciousAttachment.yaml",
"query": "let lbtime = 10m;\nlet disallowed_ext = dynamic(['ps1', 'exe', 'vbs', 'js', 'scr']);\nProofpointPOD\n| where TimeGenerated > ago(lbtime)\n| where EventType == 'message'\n| where NetworkDirection == 'inbound'\n| where FilterDisposition !in ('reject', 'discard')\n| extend attachedExt = todynamic(MsgParts)[0]['detectedExt']\n| where tolower(attachedExt) in (disallowed_ext)\n| project SrcUserUpn, AccountCustomEntity = parse_json(DstUserUpn)[0], attachedExt\n",
"queryFrequency": "PT10M",
"queryPeriod": "PT10M",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1566"
],
"templateVersion": "1.0.2",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}