ProofpointPOD - Suspicious attachment

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Id	f6a51e2c-2d6a-4f92-a090-cfb002ca611f
Rulename	ProofpointPOD - Suspicious attachment
Description	Detects when email contains suspicious attachment (file type).
Severity	Medium
Tactics	InitialAccess
Techniques	T1566
Required data connectors	ProofpointPOD
Kind	Scheduled
Query frequency	10m
Query period	10m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODSuspiciousAttachment.yaml
Version	1.0.2
Arm template	f6a51e2c-2d6a-4f92-a090-cfb002ca611f.json

KQL

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

YAML

queryPeriod: 10m
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  
name: ProofpointPOD - Suspicious attachment
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
queryFrequency: 10m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODSuspiciousAttachment.yaml
requiredDataConnectors:
- connectorId: ProofpointPOD
  dataTypes:
  - ProofpointPOD_message_CL
description: |
    'Detects when email contains suspicious attachment (file type).'
kind: Scheduled
version: 1.0.2
status: Available
severity: Medium
relevantTechniques:
- T1566
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
id: f6a51e2c-2d6a-4f92-a090-cfb002ca611f

ARM