PaloAlto - Dropping or denying session with traffic

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Id	ba663b74-51f4-11ec-bf63-0242ac130002
Rulename	PaloAlto - Dropping or denying session with traffic
Description	Detects dropping or denying session with traffic.
Severity	Medium
Tactics	InitialAccess
Techniques	T1190 T1133
Required data connectors	CefAma
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/PaloAltoCDL/Analytic Rules/PaloAltoCDLDroppingSessionWithSentTraffic.yaml
Version	1.0.4
Arm template	ba663b74-51f4-11ec-bf63-0242ac130002.json

KQL

let threshold = 100;
PaloAltoCDLEvent
| where EventResourceId =~ 'TRAFFIC'
| where EventResult has_any ("deny", "drop", "reject") 
| where tolong(DstBytes) > 0
| where tolong(NetworkPackets) > 0
| summarize count() by SrcIpAddr, DstUsername, bin(TimeGenerated, 10m)
| where count_ > threshold
| extend AccountCustomEntity = DstUsername, IPCustomEntity = SrcIpAddr

YAML

version: 1.0.4
tactics:
- InitialAccess
relevantTechniques:
- T1190
- T1133
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
triggerThreshold: 0
name: PaloAlto - Dropping or denying session with traffic
queryFrequency: 1h
triggerOperator: gt
kind: Scheduled
description: |
    'Detects dropping or denying session with traffic.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLDroppingSessionWithSentTraffic.yaml
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: CefAma
severity: Medium
query: |
  let threshold = 100;
  PaloAltoCDLEvent
  | where EventResourceId =~ 'TRAFFIC'
  | where EventResult has_any ("deny", "drop", "reject") 
  | where tolong(DstBytes) > 0
  | where tolong(NetworkPackets) > 0
  | summarize count() by SrcIpAddr, DstUsername, bin(TimeGenerated, 10m)
  | where count_ > threshold
  | extend AccountCustomEntity = DstUsername, IPCustomEntity = SrcIpAddr  
queryPeriod: 1h
id: ba663b74-51f4-11ec-bf63-0242ac130002
status: Available

ARM