PulseConnectSecure - CVE-2021-22893 Possible Pulse Connect Secure RCE Vulnerability Attack

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Id	d0c82b7f-40b2-4180-a4d6-7aa0541b7599
Rulename	PulseConnectSecure - CVE-2021-22893 Possible Pulse Connect Secure RCE Vulnerability Attack
Description	This query identifies exploitation attempts using Pulse Connect Secure(PCS) vulnerability (CVE-2021-22893) to the VPN server
Severity	High
Tactics	InitialAccess
Techniques	T1190
Required data connectors	PulseConnectSecure
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/PulseConnectSecure/PulseConnectSecureVPN-CVE_2021_22893_Exploit.yaml
Version	1.0.2
Arm template	d0c82b7f-40b2-4180-a4d6-7aa0541b7599.json

KQL

let threshold = 3;
PulseConnectSecure
| where Messages contains "Unauthenticated request url /dana-na/"
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by Source_IP
| where count_ > threshold

YAML

version: 1.0.2
relevantTechniques:
- T1190
triggerThreshold: 0
severity: High
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/PulseConnectSecure/PulseConnectSecureVPN-CVE_2021_22893_Exploit.yaml
queryPeriod: 1h
query: |
  let threshold = 3;
  PulseConnectSecure
  | where Messages contains "Unauthenticated request url /dana-na/"
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by Source_IP
  | where count_ > threshold  
id: d0c82b7f-40b2-4180-a4d6-7aa0541b7599
entityMappings:
- fieldMappings:
  - columnName: Source_IP
    identifier: Address
  entityType: IP
name: PulseConnectSecure - CVE-2021-22893 Possible Pulse Connect Secure RCE Vulnerability Attack
kind: Scheduled
description: |
    'This query identifies exploitation attempts using Pulse Connect Secure(PCS) vulnerability (CVE-2021-22893) to the VPN server'
tactics:
- InitialAccess
triggerOperator: gt
queryFrequency: 1h
metadata:
  categories:
    domains:
    - Security - Threat Intelligence
  source:
    kind: Community
  support:
    tier: Community
  author:
    name: Sittikorn S
requiredDataConnectors:
- connectorId: PulseConnectSecure
  dataTypes:
  - Syslog

ARM