THEGENTLEMEN Ransomware Gang: 5 Victims in 5 Days — Transportation, Healthcare & Technology Under Active Fire

Classification: TLP:CLEAR | Source: ransomware.live (.onion leak site telemetry) | Brief Date: 2026-09-06

Security Arsenal's dark web collection infrastructure has confirmed five new victim postings on THEGENTLEMEN's leak site within a five-day window (2026-09-01 through 2026-09-05). The cadence — one victim per day at peak — and the cross-sector, cross-continent victim spread indicate an active, scalable intrusion pipeline rather than opportunistic one-offs. This bulletin translates that underground telemetry into detection content and containment priorities for enterprise defenders.

1. Threat Actor Profile — THEGENTLEMEN

Group overview. THEGENTLEMEN operates as a semi-closed ransomware operation with RaaS characteristics: a core team maintains the encryptor, leak site, and negotiation infrastructure, while a limited set of vetted affiliates conduct initial access and intrusion operations. The branding — a faux-polite "gentlemen's club" persona in negotiation portals — is a psychological pressure tactic: professional, courteous, and firm on deadlines.

Operational model.

• Aliases / naming: Observed on leak site mirrors and negotiation portals as "The Gentlemen," "Gentlemen Group"; no confirmed rebrand lineage to a legacy family at this time, though tradecraft overlaps with ex-Conti/BlackCat affiliate tooling.
• Ransom demands: Typically scaled to victim revenue — observed range roughly $250K to $3M USD in Monero or Bitcoin, with healthcare and aviation victims receiving the upper-tier demands due to operational-criticality leverage.
• Double extortion: Confirmed. Data is staged and exfiltrated prior to encryption; leak-site publication follows a 72–120 hour negotiation window. All five recent postings include sample data dumps as proof-of-breach.
• Dwell time: Estimated 5–14 days from initial access to detonation, consistent with the rapid posting cadence observed this week.

Initial access methods (in observed order of frequency):

1. Perimeter device exploitation — VPN gateways and security appliances (consistent with CVE-2026-50751, Check Point IKEv1 improper authentication, added to CISA KEV 2026-06-08).
2. Phishing with malicious attachments/links — macro-enabled documents and trojanized developer tooling (consistent with CVE-2026-48027, the Nx Console supply-chain poisoning).
3. Exposed RDP / remote access tooling abuse — including hijacked ConnectWise ScreenConnect sessions (CVE-2024-1708 path traversal → RCE).
4. Privilege escalation post-foothold — Windows link-following (CVE-2025-60710) and Exchange deserialization (CVE-2023-21529) for authenticated lateral pivoting and mailbox data theft.

2. Current Campaign Analysis

Victim postings (leak site telemetry, last 5 days)

Sector targeting

• Healthcare is the dominant vertical (2 of 5 victims), spanning both health-data infrastructure (Veradigm — EHR/analytics, meaning the breach potentially implicates downstream provider data) and pharmacy retail (Zdrowit). Healthcare offers the gang maximum extortion leverage: regulated data, patient-safety pressure, and low tolerance for downtime.
• Transportation/aviation (Lider Aviacao) continues the 2026 trend of gangs hitting aviation ground services and charter operators — organizations with high operational tempo and historically thin segmentation between corporate IT and operations.
• Technology / software services (Seasia Infotech) is a supply-chain play: a compromised dev-shop can be a pivot point into dozens of downstream clients.
• Luxury retail (Leo Schachter Diamonds) yields high-value client lists and transaction records — prime double-extortion material.

Geographic concentration

Four countries in five days — Brazil, United States, Poland, India — with the US double-hit. This is not a regionally focused campaign; it is opportunistic global targeting driven by affiliate access availability, not victim selection ideology.

Victim profile

Mid-market to upper-mid-market enterprises, estimated $50M–$1B+ annual revenue, large enough to pay meaningful ransoms, small enough to lack mature 24/7 SOC coverage. Veradigm is the outlier at the top of that range and signals the gang is willing to take on well-resourced targets.

Posting cadence / escalation

A 1-victim-per-day peak cadence (Sep 1, 2, 4, 4, 5) suggests a backlog of simultaneously active intrusions reaching the extortion phase in waves. Historically, when gangs post in tight bursts like this, additional intrusions from the same access wave are already in progress and will surface over the next 7–14 days. If you are in one of the targeted sectors and have an unpatched perimeter device, assume you are in the pipeline.

CVE correlation — probable initial access stack

The CISA KEV additions with confirmed ransomware use map cleanly onto this gang's observed tradecraft:

• CVE-2026-50751 (Check Point IKEv1 improper authentication): primary suspected vector for the campaign wave — perimeter VPN compromise enables the cross-sector, cross-geography victim diversity observed.
• CVE-2026-48027 (Nx Console malicious code): supply-chain vector consistent with the technology-sector victim; developer workstation compromise yields credentials and CI/CD secrets.
• CVE-2024-1708 (ConnectWise ScreenConnect path traversal): remote access tool hijack — used both for initial access and as a persistence/lateral-movement channel that blends with legitimate admin traffic.
• CVE-2025-60710 (Windows link following) and CVE-2023-21529 (Exchange deserialization): post-exploitation — privilege escalation and mailbox/sensitive-data access feeding the exfiltration set.

3. Detection Engineering

The following content targets THEGENTLEMEN's observable playbook: perimeter/VPN compromise → RMM tool abuse and lateral movement → staging and exfiltration → shadow copy destruction → encryption.

---
title: THEGENTLEMEN - Suspicious RMM / Remote Access Tool Execution
id: 7f3a1c2e-9b41-4e8a-a5d6-thegentlemen01
status: experimental
description: Detects execution of remote access tooling (ScreenConnect, AnyDesk, PsExec-style services) commonly abused by THEGENTLEMEN affiliates for lateral movement and persistence after perimeter compromise.
author: Security Arsenal Threat Intelligence
references:
  - https://securityarsenal.com/darkside
  - https://www.cisa.gov/known-exploited-vulnerabilities-catalog
date: 2026/09/06
logsource:
  category: process_creation
  product: windows
level: high
tags:
  - attack.command_and_control
  - attack.t1219
  - attack.lateral_movement
  - attack.t1021.002
detection:
  selection_img:
    Image|endswith:
      - '\ScreenConnect.ClientService.exe'
      - '\ScreenConnect.WindowsClient.exe'
      - '\anydesk.exe'
      - '\psexec.exe'
      - '\psexesvc.exe'
      - '\paexec.exe'
      - '\remcom.exe'
  filter_known_paths:
    Image|startswith:
      - 'C:\Program Files\ScreenConnect'
      - 'C:\Program Files (x86)\ScreenConnect'
    ParentImage|endswith:
      - '\msiexec.exe'
  condition: selection_img and not filter_known_paths
falsepositives:
  - Legitimate IT administration via approved RMM platforms (tune known-path filters to your managed deployment)
fields:
  - Image
  - ParentImage
  - CommandLine
  - User
  - Computer
---
title: THEGENTLEMEN - Pre-Encryption Shadow Copy and Backup Destruction
id: 8a4b2d3f-1c52-4f9b-b6e7-thegentlemen02
status: experimental
description: Detects Volume Shadow Copy deletion and backup tampering via vssadmin, wbadmin, bcdedit, or wmic — a near-universal pre-detonation step in THEGENTLEMEN intrusions and a strong T-minus signal before ransomware fires.
author: Security Arsenal Threat Intelligence
references:
  - https://securityarsenal.com/darkside
date: 2026/09/06
logsource:
  category: process_creation
  product: windows
level: critical
tags:
  - attack.impact
  - attack.t1490
  - attack.t1562.001
detection:
  selection_vss:
    CommandLine|contains:
      - 'vssadmin delete shadows'
      - 'vssadmin resize shadowstorage'
      - 'delete shadows'
      - 'shadowcopy delete'
      - 'wbadmin delete catalog'
      - 'wbadmin delete backup'
      - 'bcdedit'
  selection_bcd:
    Image|endswith: '\bcdedit.exe'
    CommandLine|contains:
      - 'recoveryenabled no'
      - 'bootstatuspolicy ignoreallfailures'
  condition: selection_vss or selection_bcd
falsepositives:
  - Backup software maintenance windows (correlate with change tickets; legitimate deletion is rare and scheduled)
fields:
  - Image
  - CommandLine
  - ParentImage
  - User
  - Computer
---
title: THEGENTLEMEN - Data Staging and Exfiltration via Archiving or Cloud Sync Tools
id: 9c5e3f4a-2d63-4a1c-c7f8-thegentlemen03
status: experimental
description: Detects mass-archive creation (7z/rar with password or volume flags) and abuse of file-transfer/sync utilities (rclone, MEGAsync, FileZilla CLI) used by THEGENTLEMEN to stage and exfiltrate data prior to leak-site publication.
author: Security Arsenal Threat Intelligence
references:
  - https://securityarsenal.com/darkside
date: 2026/09/06
logsource:
  category: process_creation
  product: windows
level: high
tags:
  - attack.collection
  - attack.t1560.001
  - attack.exfiltration
  - attack.t1567.002
detection:
  selection_archive:
    CommandLine|contains:
      - '.rar '
      - '.7z '
      - ' -p'
      - '-v100m'
      - '-v500m'
    Image|endswith:
      - '\7z.exe'
      - '\7za.exe'
      - '\rar.exe'
      - '\winrar.exe'
  selection_exfil_tool:
    Image|endswith:
      - '\rclone.exe'
      - '\megacmd.exe'
      - '\MEGAsync.exe'
      - '\filezilla.exe'
      - '\pscp.exe'
      - '\winscp.exe'
  filter_it_path:
    Image|startswith: 'C:\Program Files\7-Zip\'
    CommandLine|contains: 'backup_job'
  condition: (selection_archive or selection_exfil_tool) and not filter_it_path
falsepositives:
  - Developer/build pipelines compressing artifacts; legitimate rclone backup jobs (whitelist service accounts and paths)
fields:
  - Image
  - CommandLine
  - User
  - Computer

// THEGENTLEMEN pre-ransomware staging hunt — Microsoft Sentinel / Defender XDR
// Correlates: new remote-service lateral movement + shadow copy tampering + archive creation
// across the same device within a 24h window. High-fidelity T-minus signal.
let Lookback = 7d;
let StagingWindow = 24h;
let LateralMove =
    DeviceProcessEvents
    | where TimeGenerated > ago(Lookback)
    | where FileName =~ "PSEXESVC.exe"
       or (FileName in~ ("psexec.exe","paexec.exe","wmic.exe")
           and ProcessCommandLine has_any ("\\", "process call create"))
       or (FileName =~ "net.exe" and ProcessCommandLine has "\\admin$")
    | project LateralTime=TimeGenerated, DeviceName, LateralCmd=ProcessCommandLine, InitiatingAccountName;
let ShadowTamper =
    DeviceProcessEvents
    | where TimeGenerated > ago(Lookback)
    | where ProcessCommandLine has_any ("vssadmin delete shadows",
        "wbadmin delete", "recoveryenabled no", "shadowcopy delete")
    | project ShadowTime=TimeGenerated, DeviceName, ShadowCmd=ProcessCommandLine;
let ArchiveStage =
    DeviceProcessEvents
    | where TimeGenerated > ago(Lookback)
    | where FileName in~ ("7z.exe","7za.exe","rar.exe","rclone.exe","megacmd.exe")
       or ProcessCommandLine has_any (".rar ", " -p", "copy ", "--transfers")
    | project ArchiveTime=TimeGenerated, DeviceName, ArchiveCmd=ProcessCommandLine;
LateralMove
| join kind=inner ShadowTamper on DeviceName
| join kind=inner ArchiveStage on DeviceName
| where (ShadowTime - LateralTime) between (0min .. StagingWindow)
| project DeviceName, InitiatingAccountName, LateralTime, LateralCmd, ShadowTime, ShadowCmd, ArchiveTime, ArchiveCmd
| sort by LateralTime desc;

# THEGENTLEMEN Rapid Triage — run on suspected staging/foothold hosts (elevated)
# Checks: shadow copies, 7-day persistence artifacts, suspicious services, RDP exposure
$ErrorActionPreference = 'SilentlyContinue'
$cutoff = (Get-Date).AddDays(-7)

Write-Host "=== [1] Volume Shadow Copies (THEGENTLEMEN deletes these pre-detonation) ==="
$shadows = Get-WmiObject Win32_ShadowCopy
if ($shadows) { $shadows | Select-Object DeviceObject, InstallDate | Format-Table -AutoSize }
else { Write-Host "[!] WARNING: NO shadow copies found — possible vssadmin deletion. INVESTIGATE NOW." -ForegroundColor Red }

Write-Host "=== [2] Scheduled Tasks created in last 7 days (persistence) ==="
Get-ScheduledTask | Where-Object { $_.Date -gt $cutoff } |
  Select-Object TaskName, TaskPath, Date, @{N='Author';E={$_.Author}} | Format-Table -AutoSize

Write-Host "=== [3] Services created in last 7 days (PSEXESVC / RMM implants) ==="
Get-CimInstance Win32_Service | Where-Object { $_.Name -match 'PSEXESVC|ScreenConnect|AnyDesk|rclone' -or $_.InstallDate -gt $cutoff } |
  Select-Object Name, DisplayName, PathName, StartMode, State | Format-Table -AutoSize

Write-Host "=== [4] RDP exposure check ==="
$rdp = Get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server' -Name fDenyTSConnections
$nla = Get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp' -Name UserAuthentication
Write-Host ("RDP enabled: " + $(if($rdp.fDenyTSConnections -eq 0){'YES - EXPOSED'}else{'No'}))
Write-Host ("NLA enforced: " + $(if($nla.UserAuthentication -eq 1){'Yes'}else{'NO - WEAK'}))
$rdpFw = Get-NetFirewallRule -DisplayGroup "Remote Desktop" | Where-Object Enabled -eq 'True'
if ($rdpFw) { Write-Host "[!] Remote Desktop firewall rules ENABLED — restrict to VPN/bastion only." -ForegroundColor Yellow }

Write-Host "=== [5] Recently modified executables in staging dirs ==="
Get-ChildItem 'C:\ProgramData','C:\Users\Public','C:\Windows\Temp' -Recurse -Include *.exe,*.dll,*.ps1,*.7z,*.rar |
  Where-Object { $_.LastWriteTime -gt $cutoff } |
  Select-Object FullName, LastWriteTime, Length | Sort-Object LastWriteTime -Descending |
  Select-Object -First 25 | Format-Table -AutoSize

Write-Host "=== Triage complete. Any hit in sections 1/2/3 on a server = escalate to IR immediately. ==="

4. Incident Response Priorities

T-minus detection checklist (before encryption fires)

THEGENTLEMEN's playbook has an observable pre-detonation window. Hunt these signals in order of confidence:

1. vssadmin delete shadows / wbadmin delete / bcdedit tampering — highest-fidelity T-minus indicator; treat as ransomware imminent.
2. New PSEXESVC or RMM service installation on servers that never run remote admin tooling.
3. Mass archive creation (.rar/.7z with password flags, split volumes -v100m) on file servers, HR shares, or database hosts.
4. rclone/MEGA/FileZilla network egress — large sustained outbound transfers to consumer cloud storage or bulletproof VPS ranges.
5. Check Point/VPN admin logins from unusual geographies — affiliate hands-on-keyboard sessions often originate from residential proxy exits inconsistent with your admin baseline.
6. Exchange deserialization artifacts / abnormal mailbox export — indicator of CVE-2023-21529 abuse feeding the exfil set.

Critical assets this gang prioritizes for exfiltration

• Healthcare victims: patient records, EHR/analytics databases, insurer contracts (Veradigm/Zdrowit pattern).
• All victims: HR/payroll PII, financial statements, legal contracts, executive mailbox exports — the "leak site teaser" set.
• Technology victims: client source code, CI/CD secrets, and customer lists (secondary extortion leverage against downstream clients).

Containment actions — ordered by urgency

1. Isolate, don't power off any host showing shadow-copy deletion or encryptor staging — preserve memory for forensic recovery of keys in flight.
2. Disable compromised VPN/RMM sessions at the perimeter — revoke active IKE/IPSec sessions and RMM agent enrollments; rotate all credentials used from those hosts (assume LSASS compromise).
3. Block egress to consumer cloud sync and known exfil VPS ranges at the proxy/firewall immediately.
4. Force enterprise-wide credential reset for any account observed in lateral movement telemetry; disable legacy/NTLM auth paths.
5. Snapshot and protect remaining backups — verify backup infrastructure is offline/immutable and out of the attacker's reach before declaring containment.
6. Engage IR retainer and legal/comms — leak-site publication means a notification clock is already running for regulated data (HIPAA, GDPR/PL, LGPD/BR).

5. Hardening Recommendations

Immediate (24 hours)

• Patch the KEV stack now: Check Point gateways (CVE-2026-50751), ConnectWise ScreenConnect (CVE-2024-1708), Microsoft Windows (CVE-2025-60710), Exchange (CVE-2023-21529). These are confirmed ransomware-exploited; there is no acceptable deferral.
• Audit and purge the Nx Console supply-chain exposure (CVE-2026-48027): identify developer workstations that installed the malicious build; rotate all credentials, tokens, and CI/CD secrets present on those machines.
• Disable or VPN-gate all internet-exposed RDP; enforce NLA; block inbound 3389 at the edge unconditionally.
• Deploy the Sigma rules above and run the triage script on all file servers, backup hosts, and domain controllers.
• Verify shadow copies exist on critical servers and that vssadmin execution is restricted/alerted.

Short-term (2 weeks)

• Segment backup infrastructure onto isolated networks with immutable (WORM/object-lock) storage and separate credentials — this is the single highest-leverage control against this gang's playbook.
• Implement egress filtering with category-based blocking of consumer file-sync destinations; alert on any rclone-class tooling network-wide.
• Remove standing admin rights; deploy tiered administration and LAPS; kill NTLMv1/legacy authentication paths that ease lateral movement.
• Establish a dark-web monitoring loop for your organization's name, domains, and key client names on ransomware.live-tracked leak sites — publication is often the first notification victims receive.
• Tabletop the T-minus checklist with your SOC and IT ops: the 5–14 day dwell window is only useful if someone is watching for the pre-detonation signals.

This briefing is derived from live .onion leak site telemetry collected via ransomware.live and correlated against CISA KEV. Security Arsenal's SOC tracks THEGENTLEMEN infrastructure continuously; clients of AlertMonitor receive automated indicator pushes as new victims and TTPs surface.

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