BlackCat/ALPHV Ransomware: Insider Facilitation Sentencing and Defensive Detection Strategies

---
title: Potential BlackCat/ALPHV Service Installation
id: 9a1b2c3d-4e5f-6a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects the creation of a new service where the binary path points to a file located in a suspicious directory (AppData, Temp, Public) or unsigned files in System32, common for BlackCat persistence.
references:
  - https://attack.mitre.org/techniques/T1543/003/
author: Security Arsenal
date: 2026/05/23
tags:
  - attack.persistence
  - attack.t1543.003
  - attack.privilege_escalation
logsource:
  category: process_creation
  product: windows
detection:
  selection_sc:
    Image|endswith: '\sc.exe'
    CommandLine|contains: 'create'
  selection_binpath:
    CommandLine|contains:
      - 'AppData\'
      - 'Temp\'
      - 'Public\'
      - '\Windows\Temp\'
  condition: all of selection_*
falsepositives:
  - Legitimate software installation by administrators
level: high
---
title: Suspicious Rust-Based Executable Execution
id: b2c3d4e5-6f7a-8b9c-0d1e-2f3a4b5c6d7e
status: experimental
description: Detects the execution of unsigned executables from suspicious paths that are characteristic of the Rust-based BlackCat ransomware payload.
references:
  - https://attack.mitre.org/techniques/T1059/
author: Security Arsenal
date: 2026/05/23
tags:
  - attack.execution
  - attack.t1204
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    Image|endswith:
      - '.exe'
    Image|contains:
      - '\AppData\'
      - '\Temp\'
    Company|contains: 'unknown' # Placeholder for logic checking unsigned/missing company metadata
  condition: selection
falsepositives:
  - Developer tools or legitimate portable apps
level: medium

// Hunt for service creation events pointing to suspicious paths (BlackCat persistence)
DeviceProcessEvents
| where Timestamp > ago(30d)
| where FileName in~ ("sc.exe", "powershell.exe", "cmd.exe")
| where ProcessCommandLine has_any ("create", "New-Service", "binPath=")
| where ProcessCommandLine matches regex @"(?:binPath=|FilePath=)\s*['"]?[A-Za-z]:\(Users|ProgramData|Windows\Temp)"
| extend PathExtract = extract(@"(?:binPath=|FilePath=)\s*['"]?([^'"]+)", 1, ProcessCommandLine)
| project Timestamp, DeviceName, AccountName, FileName, ProcessCommandLine, PathExtract, InitiatingProcessFileName
| order by Timestamp desc

-- Hunt for BlackCat ransom notes and potential payload binaries
SELECT FullPath, Mtime, Size, Mode
FROM glob(globs="/*RECOVER*-FILES.txt")
WHERE Mtime > now() - 7d

-- Supplemental: Hunt for unsigned executables in User profile paths modified recently
SELECT FullPath, Mtime, Size, Name
FROM glob(globs="C:/Users/*/AppData/Local/*.exe")
WHERE Mtime > now() - 48h

# BlackCat/ALPHV Remediation & Hardening Script
# Requires Administrator Privileges

Write-Host "[+] Starting BlackCat/ALPHV Hardening Checks..." -ForegroundColor Cyan

# 1. Audit Local Administrators Group (Insider Threat Check)
Write-Host "[*] Auditing Local Administrators:" -ForegroundColor Yellow
Get-LocalGroupMember -Group "Administrators" | Format-Table Name, PrincipalSource, SID

# 2. Check for Suspicious Services created in last 24 hours
Write-Host "[*] Checking for recently created services (potential persistence):" -ForegroundColor Yellow
$suspiciousServices = Get-WmiObject Win32_Service | Where-Object { 
    $_.PathName -match "AppData|Temp|Public" -and 
    $_.InstallDate -gt (Get-Date).AddHours(-24) 
}

if ($suspiciousServices) {
    Write-Host "[!] WARNING: Suspicious services found:" -ForegroundColor Red
    $suspiciousServices | Select-Object Name, PathName, State, StartMode
    # Optional: Stop and remove (Uncomment to execute)
    # $suspiciousServices | Stop-Service -Force; $suspiciousServices | Remove-Service -Force
} else {
    Write-Host "[+] No suspicious services detected." -ForegroundColor Green
}

# 3. Disable unused Protocols (SMBv1 is often used for lateral movement)
Write-Host "[*] Ensuring SMBv1 is disabled:" -ForegroundColor Yellow
Set-SmbServerConfiguration -EnableSMB1Protocol $false -Force

Write-Host "[+] Script complete. Review local administrators output closely." -ForegroundColor Cyan