THEGENTLEMEN Ransomware: Global Manufacturing Surge & VPN Exploitation Campaign

Date: 2026-06-17
Analyst: Security Arsenal Intel Team
Source: Dark Web Leak Site Monitoring (Ransomware.live)

Threat Actor Profile — THEGENTLEMEN

Known Aliases: The Gentlemen Club, GentleTeam (historical).
Operational Model: RaaS (Ransomware-as-a-Service) with a centralized core development team and a network of affiliate operators. Affiliates appear to operate with high autonomy regarding target selection.
Ransom Demands: Typically range from $500,000 to $5,000,000 USD, calculated based on victim revenue and encryption coverage. Recent negotiations suggest a willingness to accept lower sums for quick payment in manufacturing sectors.
Initial Access Vectors: Current intelligence indicates a heavy reliance on exploiting perimeter security appliances (VPNs and Firewalls) rather than traditional phishing. Specific focus on VPN vulnerabilities and unpatched Remote Management Tools.
Extortion Strategy: Aggressive double extortion. Data is exfiltrated prior to encryption. The gang maintains a polished leak site and threatens to release intellectual property (CAD designs, formulas) specifically tailored to manufacturing and energy victims.
Dwell Time: Estimated 3–10 days. Recent victims suggest a "smash and grab" acceleration, moving from initial compromise to encryption in under 72 hours.

Current Campaign Analysis

Targeting Sectors

Analysis of the 15 victims posted on 2026-06-15 reveals a distinct pivot toward Industrial Base targets:

Manufacturing (26%): Buechel Stone, Cole Manufacturing, Traublinger, Buratti.
Technology (13%): Times Software, SigmaControl.
Agriculture & Food (13%): Fecovita, Mackay Sugar.
Energy & Critical Infrastructure: Maine Oxy (US), Centre Medical Crowley (Healthcare - CA).

Geographic Distribution

The campaign is globally distributed with a significant foothold in NATO-aligned nations:

United States: 4 victims (27%)
Europe (DE, IT, FR, PL, DK, NL): 6 victims (40%)
Other (AR, SG, AU, CA): 5 victims (33%)

Victim Profile

Targets are predominantly mid-to-large enterprise entities (Revenue $50M - $1B+) with complex IT/OT environments. The inclusion of "National Museum" (Public Sector) and "Kozminski University" suggests opportunistic scanning for vulnerable perimeter devices rather than purely financially motivated targeting.

CVE Integration & Initial Access

This campaign strongly correlates with the exploitation of perimeter vulnerabilities recently added to the CISA KEV list:

CVE-2026-50751 (Check Point Security Gateway): The high frequency of compromised manufacturing and secure facilities suggests VPN gateway bypassing is a primary vector.
CVE-2026-20131 (Cisco Secure Firewall): Used to bypass border defenses and establish persistent C2 channels.
CVE-2024-1708 (ConnectWise ScreenConnect): Leveraged for initial access in Technology and Business Services sectors where remote management software is prevalent.

Detection Engineering

SIGMA Rules

YAML

---
title: Potential THEGENTLEMEN VPN Initial Access - Check Point IKEv1 Anomaly
id: a1b2c3d4-5678-90ab-cdef-1234567890ab
description: Detects potential exploitation of CVE-2026-50751 involving improper authentication in IKEv1 key exchange on Check Point Security Gateways.
status: experimental
date: 2026/06/17
author: Security Arsenal
references:
    - https://cisa.gov/known-exploited-vulnerabilities-catalog
logsource:
    product: firewall
definition: 'TODO: map your Check Point logs to the appropriate schema'
detection:
    selection:
        protocol|contains: 'IKE'
        version|contains: 'v1'
        action: 'accept'
    filter_legit:
        src_ip:
            - '10.0.0.0/8'
            - '192.168.0.0/16'
            - '172.16.0.0/12'
    condition: selection and not filter_legit
falsepositives:
    - Legitimate legacy VPN clients using IKEv1 from internal networks
level: high
tags:
    - attack.initial_access
    - cve.2026.50751
    - thegentlemen

---
title: Suspicious RDP Brute Force - THEGENTLEMEN Pattern
id: b2c3d4e5-6789-01ab-cdef-234567890abc
description: Detects multiple failed RDP login attempts followed by a success, typical of brute-force or credential stuffing activity used by ransomware affiliates.
status: experimental
date: 2026/06/17
author: Security Arsenal
logsource:
    product: windows
    service: security
detection:
    selection_failed:
        EventID: 4625
        LogonType: 10 # RemoteInteractive
    selection_success:
        EventID: 4624
        LogonType: 10
    filter:
        TargetUserName|contains:
            - 'Administrator'
            - 'Admin'
    timeframe: 15m
    condition: 10 of selection_failed and selection_success and filter
falsepositives:
    - Misconfigured legacy applications
    - Password sprays by authorized admins
level: high
tags:
    - attack.initial_access
    - attack.brute_force
    - thegentlemen

---
title: Ransomware Lateral Movement via PsExec and WMI
id: c3d4e5f6-7890-12ab-cdef-345678901bcd
description: Detects the use of PsExec or WMI for lateral movement, commonly used by THEGENTLEMEN affiliates to spread across the network before detonation.
status: experimental
date: 2026/06/17
author: Security Arsenal
logsource:
    product: windows
    service: security
detection:
    selection_psexec:
        EventID: 5145
        ShareName|contains: 'IPC$'
        RelativeTargetName|contains: 'PSEXESVC'
    selection_wmi:
        EventID: 4624
        LogonType: 3
        ProcessName|contains: 'wmiprvse.exe'
    condition: 1 of selection_*
falsepositives:
    - Legitimate system administration tasks
level: medium
tags:
    - attack.lateral_movement
    - attack.t1021.002
    - thegentlemen

KQL (Microsoft Sentinel)

Hunts for lateral movement indicators and potential staging data exfiltration.

KQL — Microsoft Sentinel / Defender

let TimeFrame = 1h;
DeviceProcessEvents
| where Timestamp > ago(TimeFrame)
// Look for common lateral movement tools
| where FileName in~ ('psexec.exe', 'psexec64.exe', 'wmic.exe', 'powershell.exe')
| extend ProcessCmdLine = ProcessCommandLine // Normalize column name if needed based on schema
| where ProcessCommandLine has "-accepteula" 
   or ProcessCommandLine has "process call" 
   or ProcessCommandLine matches regex @"invoke-expression.*downloadstring"
// Check for network connection shortly after process start
| join kind=inner (
    DeviceNetworkEvents 
    | where Timestamp > ago(TimeFrame)
    | where InitiatingProcessFileName in~ ('psexec.exe', 'psexec64.exe', 'wmic.exe', 'powershell.exe')
) on DeviceId, InitiatingProcessGuid
| summarize Count=count(), RemoteIPs=make_set(RemoteIP) by DeviceName, FileName, InitiatingProcessCommandLine
| where Count > 5

PowerShell Response Script

Rapid audit to detect THEGENTLEMEN pre-encryption activity.

PowerShell

<#
.SYNOPSIS
    THEGENTLEMEN Ransomware Post-Compromise Audit
.DESCRIPTION
    Checks for recent suspicious scheduled tasks, RDP exposure, and VSS shadow copy manipulation.
#>

Write-Host "[+] Starting THEGENTLEMEN Indicators Check..." -ForegroundColor Cyan

# 1. Check for recently created Scheduled Tasks (Common persistence)
Write-Host "\n[!] Checking Scheduled Tasks created in last 7 days..." -ForegroundColor Yellow
$suspiciousTasks = Get-ScheduledTask | Where-Object { 
    $_.Date -gt (Get-Date).AddDays(-7) -and 
    ($_.TaskName -match 'Update' -or $_.TaskName -match 'System' -or $_.Author -eq '')
}
if ($suspiciousTasks) { $suspiciousTasks | Select-Object TaskName, Date, Author, Actions } 
else { Write-Host "No suspicious recent tasks found." -ForegroundColor Green }

# 2. Check VSS Administrators Group for suspicious additions
Write-Host "\n[!] Auditing VSS Administrators membership..." -ForegroundColor Yellow
$vssAdmins = Get-LocalGroupMember -Group "VSS Administrators" -ErrorAction SilentlyContinue
if ($vssAdmins) { $vssAdmins | Select-Object Name, SID } 
else { Write-Host "Could not enumerate or group is default." -ForegroundColor Gray }

# 3. Audit Shadow Copy Storage Usage (Pre-exfil staging)
Write-Host "\n[!] Checking for abnormal disk activity on C:\..." -ForegroundColor Yellow
$vss = vssadmin list shadows 2>&1
if ($vss -match "No shadow copies") { Write-Host "No Shadow Copies present (Potential deletion event)." -ForegroundColor Red }

Write-Host "\n[+] Audit Complete. Review output for anomalies." -ForegroundColor Cyan


---

Incident Response Priorities

T-Minus Detection Checklist

If you suspect compromise, look for these artifacts before encryption fires:

Check Point Logs: Search for successful VPN connections originating from non-whitelisted geo-locations (AR, PL, SG are current hotspots for this group).
ScreenConnect Logs: Audit Sessions table for connections with Originating IP mismatching the administrator's known location.
PowerShell: Hunt for Add-PSSnapin or Invoke-Expression combined with Base64 encoded strings in Microsoft-Windows-PowerShell/Operational logs.

Critical Assets (Exfiltration Targets)

THEGENTLEMEN prioritizes:

Manufacturing: CAD files, proprietary schematics, ERP databases (SAP/Oracle).
Energy: SCADA configuration files, pipeline blueprints, safety compliance reports.
Healthcare: Patient PHI (specifically targeting insurance/billing data).

Containment Actions

Segment: Immediately isolate VPN concentrators and management subnets (e.g., /24 ranges hosting ScreenConnect servers).
Revoke: Force-reset credentials for accounts associated with Check Point and Cisco FMC administrative interfaces.
Disable: Temporarily disable the Schedule service on non-critical servers if widespread encryption has not yet started to stop task-based payloads.

Hardening Recommendations

Immediate (24 Hours)

Patch Management: Apply patches for CVE-2026-50751 (Check Point) and CVE-2026-20131 (Cisco FMC) immediately. If patching is not possible, disable IKEv1 on Check Point gateways and restrict FMC management access to dedicated jump hosts.
Remote Access: Enforce MFA on all VPNs and Remote Desktop gateways. ScreenConnect instances must be updated to the latest patched version or isolated behind a Zero Trust Access solution.
Audit: Run the PowerShell audit script above on all Domain Controllers and file servers.

Short-Term (2 Weeks)

Network Segmentation: Implement strict East-West traffic controls. Block direct RDP (3389) and SMB (445) from user subnets to server segments.
EDR Coverage: Ensure EDR sensors are deployed on all VPN appliances and management jump boxes (often blind spots).
Application Control: Implement allow-listing for PsExec, WMI, and PowerShell execution modes for non-admin users.

Related Resources

Security Arsenal Incident Response Managed SOC & MDR Services AlertMonitor Threat Detection From The Dark Side Intel Hub