THEGENTLEMEN Ransomware: Industrial Sector Blitz — Critical VPN & RMM Vulnerabilities Exploited

Date: 2026-06-18
Analyst: Security Arsenal Intel Unit
Source: Dark Web Leak Site Monitoring (Ransomware.live)

Threat Actor Profile — THEGENTLEMEN

• Aliases: None currently confirmed; operates under the single brand "THEGENTLEMEN".
• Operational Model: Highly active Ransomware-as-a-Service (RaaS) affiliate model. The sheer volume of disparate victims (15 posted in a single day) across multiple continents suggests a decentralized network of affiliates with access to a common encryption toolkit.
• Typical Ransom Demands: $500,000 - $5,000,000 USD, varying based on victim revenue and perceived ability to pay.
• Initial Access Vectors:
  • Primary: Exploitation of edge network appliances (VPNs, Firewalls) and Remote Management Tools (RMM).
  • Secondary: Phishing with macro-laden documents targeting supply chain logistics.
• TTPs: Double extortion is standard. Data is exfiltrated to cloud storage prior to encryption. They are known to delete Volume Shadow Copies (vssadmin) to prevent recovery.
• Average Dwell Time: 3–7 days. The group moves fast once initial access is established, suggesting automated tooling for lateral movement and data staging.

Current Campaign Analysis

Observation Period: 2026-06-15 to 2026-06-18

Sector Targeting

THEGENTLEMEN has launched a coordinated strike against critical industrial and logistical sectors.

• Manufacturing (30%): Buechel Stone (US), Cole Manufacturing (US), Traublinger (DE), Buratti (IT).
• Energy & Critical Infrastructure (13%): Maine Oxy (US).
• Agriculture & Food Production (13%): Fecovita (AR), Mackay Sugar (AU).
• Technology (13%): Times Software (SG), SigmaControl (NL).
• Targeted Victim Profile: Mid-to-large enterprises ($50M - $500M revenue). They appear to favor organizations with complex supply chains or time-sensitive operational continuity.

Geographic Concentration

While global, the campaign shows a distinct tilt towards North America (US) and Europe (DE, FR, IT, PL). However, the inclusion of victims in Argentina (AR), Singapore (SG), and Australia (AU) indicates a "shotgun" approach to finding vulnerable internet-facing infrastructure regardless of location.

CVE Exploitation Correlation

This campaign correlates directly with recent CISA KEV additions. The victims suggest successful exploitation of:

• CVE-2026-50751 (Check Point Security Gateway): The targeting of energy and manufacturing sectors (which rely heavily on VPNs) aligns with this vulnerability.
• CVE-2024-1708 (ConnectWise ScreenConnect): widespread use in IT support for manufacturing makes this a high-value vector for the group.
• CVE-2023-21529 (Microsoft Exchange): Likely used for the university and public sector breaches.

Detection Engineering

The following detection logic is designed to catch the specific initial access vectors and pre-encryption activity associated with THEGENTLEMEN.

title: Potential ConnectWise ScreenConnect Authentication Bypass (CVE-2024-1708)
id: 4a9c8f2d-1e3b-4567-8910-112233445566
status: experimental
description: Detects suspicious path traversal patterns and abnormal authentication requests associated with ConnectWise ScreenConnect exploitation.
references:
    - https://cisa.gov/known-exploited-vulnerabilities-catalog
author: Security Arsenal
date: 2026/06/18
tags:
    - attack.initial_access
    - cve.2024-1708
    - thegentlemen
    - remote.session
logsource:
    category: webserver
    product: apache
detection:
    selection_uri:
        c-uri|contains:
            - '/bin/.?'
            - 'Login.aspx'
            - 'Host.ashx'
    selection_suspicious_params:
        cs-uri-query|contains:
            - 'SessionId='
            - 'SetAccount'
    filter_legit:
        sc-status: 200
    condition: selection_uri and selection_suspicious_params and not filter_legit
falsepositives:
    - Legitimate administrative access (verify user-agent)
level: high
---
title: Check Point Security Gateway IKEv1 Anomaly (CVE-2026-50751)
id: b1c2d3e4-5f6a-7890-1234-567890abcdef
status: experimental
description: Detects potential exploitation of Check Point VPN improper authentication via IKEv1 mismatch patterns or high-volume auth failures.
references:
    - https://cisa.gov/known-exploited-vulnerabilities-catalog
author: Security Arsenal
date: 2026/06/18
tags:
    - attack.initial_access
    - cve.2026-50751
    - thegentlemen
    - vpn
logsource:
    category: firewall
    product: checkpoint
detection:
    selection_ikev1:
        protocol: 'IKE'
        version: 'v1'
    selection_failure:
        action: 'drop' or 'reject'
    selection_volume:
        count: 10
    timeframe: 1m
    condition: selection_ikev1 and selection_failure | selection_volume
falsepositives:
    - Misconfigured VPN clients
    - Internet noise
level: critical
---
title: THEGENTLEMEN Pre-Encryption Activity - Shadow Copy Deletion
id: c3d4e5f6-7a8b-9012-3456-789012345678
status: experimental
description: Detects commands used to delete Volume Shadow Copies, a standard step in THEGENTLEMEN playbook before encryption.
author: Security Arsenal
date: 2026/06/18
tags:
    - attack.impact
    - thegentlemen
    - defense.evasion
logsource:
    category: process_creation
    product: windows
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:
    - System administrators performing maintenance
level: critical

KQL (Microsoft Sentinel)

Hunt for suspicious PowerShell execution often used post-exploitation for lateral movement or data staging.

DeviceProcessEvents 
| where Timestamp > ago(7d)
| where FileName in~ ("powershell.exe", "pwsh.exe")
| where ProcessCommandLine has_any ("IEX", "Invoke-Expression", "DownloadString", "FromBase64String", "encod", "compress")
| where InitiatingProcessFileName !in~ ("explorer.exe", "services.exe", "svchost.exe") 
| project Timestamp, DeviceName, AccountName, ProcessCommandLine, InitiatingProcessFileName, FolderPath
| order by Timestamp desc

PowerShell - Rapid Response Hardening

Execute this script on critical servers to identify recent scheduled tasks often used for persistence by ransomware groups.

# Check for Scheduled Tasks created in the last 7 days
$DateCutoff = (Get-Date).AddDays(-7)
Get-ScheduledTask | Where-Object {$_.Date -gt $DateCutoff} | 
    Select-Object TaskName, TaskPath, Date, Author, Actions | 
    Format-Table -AutoSize

# Check for abnormal network connections (potential C2)
Get-NetTCPConnection -State Established -ErrorAction SilentlyContinue | 
    Where-Object {$_.RemoteAddress -notmatch "^(127\.|10\.|172\.(1[6-9]|2[0-9]|3[01])\.|192\.168\.)"} | 
    Select-Object LocalPort, RemoteAddress, RemotePort, OwningProcess | 
    Sort-Object RemoteAddress -Unique


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Incident Response Priorities

If THEGENTLEMEN activity is suspected, enact the following T-minus checklist immediately:

1. T-60 Minutes (Isolation):
   • Disconnect all Check Point VPN interfaces immediately until patches for CVE-2026-50751 are verified.
   • Suspend external access to ConnectWise ScreenConnect instances.
2. T-30 Minutes (Hunting):
   • Hunt for vssadmin.exe execution logs in SIEM. If found, encryption is imminent or already in progress.
   • Review Exchange IIS logs for anomalous POST requests (/ecp/..., /owa/...)
3. Critical Assets: This group targets CAD/Design files (Manufacturing) and Mailing Lists/DBs (Education/Public). Prioritize imaging file servers housing these data types.
4. Containment:
   • Disable local admin accounts on domain controllers.
   • Revoke credentials for service accounts used on the breached VPN/RMM tools.

Hardening Recommendations

Immediate (24 Hours)

• Patch Edge: Apply the out-of-band patch for CVE-2026-50751 (Check Point) to all Security Gateways.
• RMM Hygiene: Update ConnectWise ScreenConnect to the latest patched version to mitigate CVE-2024-1708. Enforce MFA on all RMM console access.
• Block Port 445: Ensure internal firewall rules block SMB (TCP 445) from DMZ zones to the internal network to prevent lateral movement from VPN exploits.

Short-term (2 Weeks)

• Network Segmentation: Move Industrial Control Systems (ICS) and SCADA networks behind a zero-trust jump host, isolating them from the corporate VPN where possible.
• Identity Access: Implement phishing-resistant MFA (FIDO2) for all remote access points.

Related Resources

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