PulseConnectSecure - Potential Brute Force Attempts

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Id	34663177-8abf-4db1-b0a4-5683ab273f44
Rulename	PulseConnectSecure - Potential Brute Force Attempts
Description	This query identifies evidence of potential brute force attack by looking at multiple failed attempts to log into the VPN server
Severity	Low
Tactics	CredentialAccess
Techniques	T1110
Required data connectors	SyslogAma
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/Pulse Connect Secure/Analytic Rules/PulseConnectSecureVPN-BruteForce.yaml
Version	1.0.4
Arm template	34663177-8abf-4db1-b0a4-5683ab273f44.json

KQL

let threshold = 20;
PulseConnectSecure
| where Messages contains "Login failed"
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by User, Source_IP
| where count_ > threshold

YAML

queryPeriod: 1h
query: |
  let threshold = 20;
  PulseConnectSecure
  | where Messages contains "Login failed"
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by User, Source_IP
  | where count_ > threshold  
name: PulseConnectSecure - Potential Brute Force Attempts
entityMappings:
- fieldMappings:
  - columnName: User
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: Source_IP
    identifier: Address
  entityType: IP
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Pulse Connect Secure/Analytic Rules/PulseConnectSecureVPN-BruteForce.yaml
requiredDataConnectors:
- connectorId: SyslogAma
  datatypes:
  - Syslog
description: |
    'This query identifies evidence of potential brute force attack by looking at multiple failed attempts to log into the VPN server'
kind: Scheduled
version: 1.0.4
status: Available
severity: Low
relevantTechniques:
- T1110
triggerOperator: gt
triggerThreshold: 0
tactics:
- CredentialAccess
id: 34663177-8abf-4db1-b0a4-5683ab273f44

ARM