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

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

ARM