Malware attachment delivered

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Id	0558155e-4556-447e-9a22-828f2a7de06b
Rulename	Malware attachment delivered
Description	This query identifies a message containing a malware attachment that was delivered.
Severity	Medium
Tactics	InitialAccess
Techniques	T1566.001
Required data connectors	ProofpointTAPv2
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/ProofPointTap/Analytic Rules/MalwareAttachmentDelivered.yaml
Version	1.0.6
Arm template	0558155e-4556-447e-9a22-828f2a7de06b.json

KQL

ProofPointTAPMessagesDeliveredV2_CL
| mv-expand todynamic(threatsInfoMap)
| mv-expand todynamic(messageParts)
| extend threatType = tostring(threatsInfoMap.threatType), classification = tostring(threatsInfoMap.classification)
| extend filename = tostring(messageParts.filename)
| where threatType =~ "attachment" and classification =~ "malware"
| summarize filenames = make_set(filename), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by TimeGenerated, Sender = sender, SenderIPAddress = senderIP, Recipient = tostring(recipient), threatType, classification, Subject = subject
| mv-expand todynamic(Recipient)
| extend RecipientName = tostring(split(Recipient, "@")[0]), RecipientUPNSuffix = tostring(split(Recipient, "@")[1])
| extend SenderName = tostring(split(Sender, "@")[0]), SenderUPNSuffix = tostring(split(Sender, "@")[1])

YAML

description: |
    'This query identifies a message containing a malware attachment that was delivered.'
triggerThreshold: 0
queryPeriod: 1h
triggerOperator: gt
kind: Scheduled
relevantTechniques:
- T1566.001
query: |
  ProofPointTAPMessagesDeliveredV2_CL
  | mv-expand todynamic(threatsInfoMap)
  | mv-expand todynamic(messageParts)
  | extend threatType = tostring(threatsInfoMap.threatType), classification = tostring(threatsInfoMap.classification)
  | extend filename = tostring(messageParts.filename)
  | where threatType =~ "attachment" and classification =~ "malware"
  | summarize filenames = make_set(filename), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by TimeGenerated, Sender = sender, SenderIPAddress = senderIP, Recipient = tostring(recipient), threatType, classification, Subject = subject
  | mv-expand todynamic(Recipient)
  | extend RecipientName = tostring(split(Recipient, "@")[0]), RecipientUPNSuffix = tostring(split(Recipient, "@")[1])
  | extend SenderName = tostring(split(Sender, "@")[0]), SenderUPNSuffix = tostring(split(Sender, "@")[1])  
queryFrequency: 1h
requiredDataConnectors:
- connectorId: ProofpointTAPv2
  dataTypes:
  - ProofPointTAPMessagesDeliveredV2_CL
name: Malware attachment delivered
severity: Medium
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: Recipient
  - identifier: Name
    columnName: RecipientName
  - identifier: UPNSuffix
    columnName: RecipientUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: FullName
    columnName: Sender
  - identifier: Name
    columnName: SenderName
  - identifier: UPNSuffix
    columnName: SenderUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: SenderIPAddress
  entityType: IP
version: 1.0.6
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ProofPointTap/Analytic Rules/MalwareAttachmentDelivered.yaml
status: Available
id: 0558155e-4556-447e-9a22-828f2a7de06b
tactics:
- InitialAccess

ARM