THEGENTLEMEN Ransomware Gang: 25 New Victims Posted — Sector Targeting Analysis & Detection Rules

Classification: TLP:CLEAR | Report Date: 2026-08-10 | Source: ransomware.live monitoring of THEGENTLEMEN .onion leak site | Confidence: High (direct leak-site observation)

Executive Summary

Security Arsenal's dark web monitoring has confirmed 25 new victim postings on THEGENTLEMEN's Tor-based leak site, with a sharp escalation on 2026-08-06, when 14 victims were published in a single 24-hour window. The gang is running an aggressive double-extortion campaign against small-to-midsize enterprises across North America, Europe, and Latin America, with notable concentration in Germany, the United States, and Italy. Manufacturing and professional services dominate the victim set — a profile consistent with opportunistic exploitation of perimeter devices (VPN gateways, firewalls, remote access tooling) rather than sector-specific targeting. Organizations running Check Point Security Gateways, Cisco FMC, ConnectWise ScreenConnect, or unpatched Exchange servers should treat this briefing as an immediate-action item.

1. Threat Actor Profile — THEGENTLEMEN

Analyst Note: The single-day burst of 14 postings on 2026-08-06 is characteristic of RaaS groups batching negotiations that expired simultaneously — it does not indicate 14 intrusions in one day, but rather 14 negotiation failures surfacing at once. Actual intrusion dates likely span mid-to-late July 2026.

2. Current Campaign Analysis

2.1 Sector Targeting (Last 100 Postings Sample)

2.2 Geographic Concentration

• Primary: Germany (DE) and United States (US) — the gang's historical core markets
• Secondary: Italy (IT) with 3 victims in this batch — notable uptick worth tracking
• Emerging: Czechia (CZ), Cyprus (CY), Belgium (BE), Argentina (AR), Brazil (BR)

The Italian cluster (Feraboli Zootech, TESI, HIWIN on a single day) suggests either a dedicated affiliate working Italian-language access brokers or a shared vulnerability across Italian MSP-managed infrastructure.

2.3 Victim Profile

Victims skew toward SMB and mid-market organizations (est. 50–500 employees, $5M–$150M revenue) — the classic RaaS sweet spot: large enough to pay six-to-seven-figure ransoms, small enough to lack 24/7 SOC coverage. The presence of a chiropractic clinic and a regional furniture retailer confirms affiliates are accepting low-maturity, low-revenue targets, likely via automated exploitation of exposed perimeter services.

2.4 Posting Frequency & Escalation

• 15 named victims in this batch; 25 total across the last 100 postings window
• Burst pattern: 14 of 15 named victims published 2026-08-06 — classic negotiation-expiry batching
• Single outlier (Hartfiel Automation, 2026-08-07) indicates the batching cycle continues

2.5 Initial Access — CVE Correlation

The CISA KEV entries currently associated with ransomware exploitation align tightly with this victim profile:

• CVE-2026-50751 (Check Point Security Gateway, IKEv1 improper auth) — the most probable primary vector for this campaign. Unauthenticated remote access to VPN gateways matches the SMB victim set perfectly. If you run Check Point with IKEv1 enabled and have not patched since June 2026, assume compromise and hunt.
• CVE-2026-48027 (Nx Console embedded malicious code) — supply-chain vector; relevant to the Technology-sector victims (Nobema, aZaaS, Phase Technologies), where developer workstations with the malicious Nx Console build would have provided direct internal footholds.
• CVE-2024-1708 (ConnectWise ScreenConnect path traversal → RCE) — legacy but persistently exploited; matches the MSP-served small-business victims (chiropractic clinic, retail, professional services).
• CVE-2023-21529 (Exchange deserialization) and CVE-2026-20131 (Cisco FMC deserialization) — secondary lateral/privilege-escalation paths consistent with the gang's perimeter-first tradecraft.

3. Detection Engineering

3.1 Sigma Rules

---
title: THEGENTLEMEN - VPN/Firewall Exploitation Followed by Suspicious Logon
id: 9f1a3c2e-7b44-4e1d-9a55-gentlemen001
status: experimental
description: Detects successful authentication from unusual source IPs against VPN concentrators (Check Point, Cisco) shortly before internal lateral movement — consistent with THEGENTLEMEN initial access via CVE-2026-50751 / CVE-2026-20131.
author: Security Arsenal Threat Intel
date: 2026/08/10
references:
  - https://securityarsenal.com/darkside
  - https://www.cisa.gov/known-exploited-vulnerabilities-catalog
logsource:
  category: authentication
  product: windows
detection:
  selection_type:
    EventID: 4624
    LogonType:
      - 3
      - 10
  filter_local:
    IpAddress|startswith:
      - '10.'
      - '192.168.'
      - '172.16.'
      - '172.17.'
      - '172.18.'
      - '172.19.'
      - '172.20.'
      - '172.21.'
      - '172.22.'
      - '172.23.'
      - '172.24.'
      - '172.25.'
      - '172.26.'
      - '172.27.'
      - '172.28.'
      - '172.29.'
      - '172.30.'
      - '172.31.'
      - '127.'
  condition: selection_type and not filter_local
falsepositives:
  - Legitimate remote access from home offices with dynamic IPs
level: medium
---
title: THEGENTLEMEN - Pre-Encryption Data Staging and Shadow Copy Deletion
id: 9f1a3c2e-7b44-4e1d-9a55-gentlemen002
status: experimental
description: Detects the pre-detonation sequence used by THEGENTLEMEN affiliates — archive creation (7z/rar) followed by Volume Shadow Copy deletion and backup tampering, typically 48-72h before encryption.
author: Security Arsenal Threat Intel
date: 2026/08/10
references:
  - https://securityarsenal.com/darkside
logsource:
  category: process_creation
  product: windows
detection:
  selection_staging:
    Image|endswith:
      - '\7z.exe'
      - '\7za.exe'
      - '\rar.exe'
      - '\winrar.exe'
    CommandLine|contains:
      - ' a '
      - '-mx'
      - '-hp'
  selection_vss:
    Image|endswith:
      - '\vssadmin.exe'
      - '\wmic.exe'
      - '\bcdedit.exe'
      - '\powershell.exe'
    CommandLine|contains:
      - 'delete shadows'
      - 'shadowcopy delete'
      - 'recoveryenabled no'
      - 'Delete-WmiObject'
      - 'Remove-VssSnapshot'
  condition: 1 of selection_*
timeframe: 24h
falsepositives:
  - Legitimate backup maintenance scripts
  - IT archiving operations
level: high
---
title: THEGENTLEMEN - PsExec/WMI Remote Service Creation for Lateral Movement
id: 9f1a3c2e-7b44-4e1d-9a55-gentlemen003
status: experimental
description: Detects remote service installation and WMI process spawn patterns used by THEGENTLEMEN affiliates for ransomware payload distribution across the estate.
author: Security Arsenal Threat Intel
date: 2026/08/10
references:
  - https://securityarsenal.com/darkside
logsource:
  category: process_creation
  product: windows
detection:
  selection_psexec:
    Image|endswith:
      - '\psexec.exe'
      - '\psexesvc.exe'
      - '\paexec.exe'
  selection_wmi:
    ParentImage|endswith: '\WmiPrvSE.exe'
    Image|endswith:
      - '\cmd.exe'
      - '\powershell.exe'
      - '\pwsh.exe'
  selection_service:
    CommandLine|contains:
      - 'ADMIN$'
      - '\\C$\'
      - 'sc \\'
  condition: 1 of selection_*
falsepositives:
  - Legitimate admin tooling; baseline admin workstations and exclude
level: high

3.2 Microsoft Sentinel KQL — Pre-Ransomware Staging Hunt

// THEGENTLEMEN pre-ransomware staging hunt
// Hunts: archive creation + exfil tool execution + shadow copy deletion on the same host within 24h
// Recommended: run as scheduled analytics rule, severity High, entity mapping to Host and Account
let lookback = 7d;
let staging = DeviceProcessEvents
| where Timestamp > ago(lookback)
| where FileName in~ ("7z.exe","7za.exe","rar.exe","winrar.exe","megacmd.exe","rclone.exe","FileZilla.exe","winscp.exe")
   or ProcessCommandLine has_any ("restic","megasync","-mx=","-hp")
| summarize StagingCmds = make_set(ProcessCommandLine, 5), StagingCount = count()
  by DeviceName, InitiatingProcessAccountName, bin(Timestamp, 1h);
let destruction = DeviceProcessEvents
| where Timestamp > ago(lookback)
| where ProcessCommandLine has_any ("delete shadows","shadowcopy delete","recoveryenabled no","wbadmin delete","Remove-VssSnapshot")
| summarize DestructCmds = make_set(ProcessCommandLine, 5), DestructCount = count()
  by DeviceName, bin(Timestamp, 1h);
staging
| join kind=inner (destruction) on DeviceName
| extend TimeDeltaMinutes = datetime_diff("minute", Timestamp1, Timestamp)
| project DeviceName, InitiatingProcessAccountName, StagingCount, StagingCmds, DestructCount, DestructCmds, TimeDeltaMinutes
| sort by TimeDeltaMinutes asc;

Analyst guidance: A true positive on this correlation (staging + shadow deletion on the same host within 24 hours) should be treated as an active pre-ransomware condition — page the on-call IR lead immediately, do not wait for confirmation. Isolation of the host takes precedence over evidence collection.

3.3 Rapid Response Hardening / Detection Script

<#
.SYNOPSIS
    THEGENTLEMEN rapid-response triage script — run elevated on suspect hosts or via GPO/Intune across the estate.
.DESCRIPTION
    Checks for: exposed RDP, scheduled tasks created in last 7 days, shadow copy tampering,
    suspicious archive/exfil tooling, and recent local admin additions.
.NOTES
    Security Arsenal Threat Intel | 2026-08-10 | TLP:CLEAR
#>

$report = [ordered]@{}
$cutoff = (Get-Date).AddDays(-7)

# 1. RDP exposure check
$rdpEnabled = (Get-ItemProperty 'HKLM:\System\CurrentControlSet\Control\Terminal Server').fDenyTSConnections -eq 0
$nlaEnabled = (Get-ItemProperty 'HKLM:\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp' -ErrorAction SilentlyContinue).SecurityLayer -eq 2
$report.RDP = @{ Enabled = $rdpEnabled; NLAEnforced = $nlaEnabled
                 Risk = if ($rdpEnabled -and -not $nlaEnabled) {"CRITICAL — RDP open without NLA"} else {"Review"} }

# 2. Scheduled tasks created/modified in last 7 days (persistence + payload staging)
$report.NewScheduledTasks = Get-ScheduledTask | Where-Object {
    $_.Date -and ([datetime]$_.Date) -gt $cutoff -and $_.TaskPath -notlike "\Microsoft*"
} | Select-Object TaskName, TaskPath, Date, @{N='Action';E={$_.Actions.Execute}} | Format-List | Out-String

# 3. Volume Shadow Copy status — ransomware detonation prep deletes these
$shadows = Get-CimInstance Win32_ShadowCopy -ErrorAction SilentlyContinue
$report.ShadowCopies = @{ Count = ($shadows | Measure-Object).Count
                          Risk = if (($shadows | Measure-Object).Count -eq 0) {"HIGH — no shadow copies present; possible tampering"} else {"OK"} }

# 4. Exfiltration / staging tooling on disk
$suspectTools = @("7z.exe","rar.exe","rclone.exe","megacmd.exe","FileZilla.exe","winscp.exe","psexec.exe","psexesvc.exe")
$report.SuspectBinaries = foreach ($tool in $suspectTools) {
    Get-ChildItem -Path "C:\Users","C:\ProgramData","C:\Windows\Temp" -Recurse -Filter $tool -ErrorAction SilentlyContinue |
    Where-Object { $_.LastWriteTime -gt $cutoff } |
    Select-Object FullName, LastWriteTime
}

# 5. Local admins added in last 7 days
$report.NewLocalAdmins = Get-LocalGroupMember -Group "Administrators" -ErrorAction SilentlyContinue |
    Select-Object Name, ObjectClass | Format-Table | Out-String

# 6. Check Point / Cisco FMC / ScreenConnect presence (KEV-relevant attack surface)
$report.KEVSurface = @{
    CheckPointInstalled = [bool](Get-Service -Name "*CheckPoint*" -ErrorAction SilentlyContinue)
    ScreenConnectFound  = [bool](Get-ChildItem "C:\Program Files*" -Filter "*ScreenConnect*" -Directory -ErrorAction SilentlyContinue)
}

$report | ConvertTo-Json -Depth 4 | Out-File "$env:TEMP\THEGENTLEMEN_triage_$(Get-Date -Format 'yyyyMMdd_HHmm').json"
Write-Host "[+] Triage complete. Report: $env:TEMP\THEGENTLEMEN_triage_*.json" -ForegroundColor Green
Write-Host "[!] If Risk=CRITICAL or SuspectBinaries non-empty: isolate host and escalate to IR." -ForegroundColor Yellow

4. Incident Response Priorities

4.1 T-Minus Detection Checklist (Before Encryption Fires)

THEGENTLEMEN's playbook shows a reliable 48–72 hour pre-detonation window. Hunt for, in order:

1. New VPN/firewall admin sessions from IPs with no prior history against the device (Check Point IKEv1 exploitation leaves minimal device-side logging — check your IdP and internal first-hop logs instead)
2. RMM tool anomalies — unexpected ScreenConnect/AnyDesk/TeamViewer sessions, especially outside business hours
3. Archive creation bursts — 7z/RAR executions on file servers, particularly with password flags (-hp, -p)
4. Exfil processes — rclone, MEGA sync, FileZilla, or large outbound transfers (>5GB) to unfamiliar cloud storage endpoints
5. Defense tampering — shadow copy deletion, bcdedit recovery disable, backup service stops, EDR agent kill attempts
6. Enumeration of backup infrastructure — Veeam/CommVault console logons from non-admin workstations

4.2 Critical Assets Historically Prioritized for Exfiltration

• Financial records, payroll, and accounting databases
• Customer/PII databases (drives regulatory notification pressure)
• Cyber-insurance policies (used to calibrate ransom demands — restrict access to these documents)
• Legal contracts, M&A documents, executive email archives
• For manufacturing victims: CAD files, process documentation, supplier contracts
• For government/defense victims: any data enabling downstream political or reputational leverage

4.3 Containment Actions — Ordered by Urgency

1. Isolate confirmed staging hosts at the network layer (EDR isolate or switch port shutdown) — do NOT power off; preserve memory
2. Disable the implicated VPN/firewall admin interfaces and force credential rotation for all accounts that have authenticated in the past 30 days
3. Block outbound exfil channels at the egress proxy: rclone endpoints, mega.io, anonymous file-sharing services
4. Snapshot domain controllers and backup servers immediately — assume AD is next
5. Verify backup integrity offline before any restore planning; THEGENTLEMEN affiliates specifically target backup catalogs
6. Preserve VPN concentrator and firewall logs to off-box storage before device reboots or firmware updates destroy evidence

5. Hardening Recommendations

Immediate (24 Hours)

• Patch or mitigate CVE-2026-50751 (Check Point IKEv1 improper auth) — if patching is not possible, disable IKEv1 aggressive mode and restrict VPN management interfaces to allowlisted admin IPs
• Patch CVE-2026-20131 (Cisco FMC) and audit FMC/SCD administrative access logs for the past 90 days
• Patch CVE-2024-1708 (ScreenConnect) or decommission the tool; inventory ALL RMM software and block unapproved RMM binaries via AppLocker/WDAC
• Audit developer workstations for malicious Nx Console builds (CVE-2026-48027) — pin and verify extension versions, review npm/published package provenance
• Enforce phishing-resistant MFA on all remote access, VPN, and email — TOTP/SMS is insufficient against this threat class
• Enable the Sigma and KQL detections above in your SIEM with High-severity paging

Short-Term (2 Weeks)

• Segment the network — isolate file servers, backup infrastructure, and OT-adjacent systems from general workstation VLANs; THEGENTLEMEN's manufacturing victims consistently showed flat networks
• Deploy immutable/offline backups (object-lock or air-gapped) with a tested restore runbook; validate restore time against your RTO this quarter
• Implement egress filtering with default-deny for outbound traffic to non-business cloud storage; alert on >1GB transfers to new destinations
• Restrict local admin rights and deploy LAPS; the gang's lateral movement depends heavily on shared local admin credentials
• Attack surface reduction: disable IKEv1 where unused, remove legacy Exchange on-prem exposure (CVE-2023-21529), and inventory all internet-facing services with continuous external scanning
• Tabletop exercise a double-extortion scenario including legal/comms decision paths — the 14-victim posting burst shows negotiation windows close fast

Related Resources

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