CRPXO Ransomware: Healthcare Sector Blitz — Remote Access Exploitation & Detection Engineering

---
title: Potential ScreenConnect Authentication Bypass
id: cddc5a38-2b57-48a6-9d2a-3b9c5f5e2e8d
description: Detects potential exploitation of CVE-2024-1708 involving suspicious path traversal or authentication anomalies in ConnectWise ScreenConnect logs.
status: experimental
date: 2026/07/09
author: Security Arsenal
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4624
        LogonType: 10
        IpAddress|startswith:
            - '10.'
            - '192.168.'
    filter_legit:
        SubjectUserName|contains:
            - 'MSP_'
            - 'Admin_'
    condition: selection and not filter_legit
falsepositives:
    - Legitimate administrative RDP sessions
level: high
tags:
    - attack.initial_access
    - cve.2024.1708
    - crpxo
---
title: Check Point IKEv1 Authentication Anomaly
id: 9f8e7d6c-5b4a-3f2e-1d0c-9b8a7f6e5d4c
description: Detects potential exploitation of CVE-2026-50751 via abnormal IKEv1 negotiation patterns or high volume of failed authentication attempts on Check Point gateways.
status: experimental
date: 2026/07/09
author: Security Arsenal
logsource:
    product: firewall
    service: checkpoint
detection:
    selection:
        protocol: 'IKE'
        version: 'v1'
        action: 'drop' or 'reject'
    condition: selection | count() > 50
 timeframe: 1m
falsepositives:
    - Misconfigured VPN peers
    - Internet scanning noise
level: critical
tags:
    - attack.initial_access
    - cve.2026.50751
    - crpxo
---
title: Ransomware VSS Deletion Pattern
id: a1b2c3d4-e5f6-7890-1234-5678abcdef90
description: Detects commands used by CRPXO affiliates to delete Volume Shadow Copies to prevent recovery.
status: experimental
date: 2026/07/09
author: Security Arsenal
logsource:
    product: windows
    service: process_creation
detection:
    selection_vssadmin:
        Image|endswith: '\vssadmin.exe'
        CommandLine|contains: 'delete shadows'
    selection_wmic:
        Image|endswith: '\wmic.exe'
        CommandLine|contains: 'shadowcopy delete'
    condition: 1 of selection_*
falsepositives:
    - Legitimate system administration scripts
level: high
tags:
    - attack.impact
    - crpxo

let TimeRange = 1h;
// Hunt for SMB lateral movement and PsExec usage common in CRPXO playbooks
DeviceProcessEvents 
| where Timestamp > ago(TimeRange)
| where InitiatingProcessFileName in ('powershell.exe', 'cmd.exe', 'wmi.exe')
| where ProcessCommandLine has_any ('Invoke-Command', 'New-PSSession', 'psexec', 'psexec64')
| where ProcessCommandLine has_any ('\\', '-c', '-d')
| project Timestamp, DeviceName, AccountName, InitiatingProcessFileName, ProcessCommandLine, FolderPath
| order by Timestamp desc

# CRPXO Rapid Response Script
# Checks for recent VSS deletions and abnormal scheduled tasks (CRPXO persistence)

Write-Host "[*] CRPXO Rapid Response Check" -ForegroundColor Cyan

# 1. Check for VSS Deletion events in last 24h
Write-Host "[+] Checking for Volume Shadow Copy Deletions..." -ForegroundColor Yellow
$vssEvents = Get-WinEvent -FilterHashtable @{LogName='Application'; ProviderName='VSS'; ID=12345} -ErrorAction SilentlyContinue | Where-Object {$_.TimeCreated -gt (Get-Date).AddHours(-24)}
if ($vssEvents) { Write-Host "[!] CRITICAL: VSS Deletion detected!" -ForegroundColor Red; $vssEvents | Format-List TimeCreated, Message }
else { Write-Host "[OK] No recent VSS deletion events found." -ForegroundColor Green }

# 2. Hunt for Scheduled Tasks created in last 7 days (CRPXO persistence)
Write-Host "[+] Checking for Scheduled Tasks created/modified in last 7 days..." -ForegroundColor Yellow
$cutoffDate = (Get-Date).AddDays(-7)
Get-ScheduledTask | Where-Object {$_.Date -gt $cutoffDate} | ForEach-Object {
    $taskInfo = Get-ScheduledTaskInfo -TaskName $_.TaskName -TaskPath $_.TaskPath
    Write-Host "[!] Suspicious Task Found: $($_.TaskName) (Last Run: $($taskInfo.LastRunTime))" -ForegroundColor Red
}

Write-Host "[*] Script Complete." -ForegroundColor Cyan


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