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

queryPeriod: 1h
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  
name: PaloAlto - Dropping or denying session with traffic
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLDroppingSessionWithSentTraffic.yaml
requiredDataConnectors:
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
description: |
    'Detects dropping or denying session with traffic.'
kind: Scheduled
version: 1.0.4
status: Available
severity: Medium
relevantTechniques:
- T1190
- T1133
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
id: ba663b74-51f4-11ec-bf63-0242ac130002

ARM