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Ransomware Escalation: New Gentlemen’s RaaS Unleashed, Targeting Windows, Linux, AND VMware ESXi

By CyberDudeBivash · 30 Oct 2025 · cyberbivash.blogspot.com · cyberdudebivash.com

LinkedIn: ThreatWire cryptobivash.code.blog

Critical: A new “Gentlemen’s” Ransomware-as-a-Service (RaaS) family is advertising cross-platform lockers for Windows, Linux, and VMware ESXi, with double-extortion playbooks and built-in domain spread. Prepare for swift lateral movement and hypervisor-level impact.

This rapid response brief explains the affiliate TTPs, how the ESXi variant disables VMs for bulk encryption, and the exact patching, hardening, detections, and recovery steps you must apply today across on-prem and cloud VMware estates.

TL;DR — Shut exposed RDP/VPN, enforce MFA for all admins, apply hypervisor hardening, snapshot/backup offline, block LOLBins, and push EDR rules for mass-encrypt behaviors. Prioritize ESXi hosts and domain controllers first.Contents

What’s New in “Gentlemen’s” RaaS

• Triple builds: Windows, Linux, ESXi lockers shipped to affiliates; one panel to generate custom builds.
• Double-extortion: bulk exfil (FTP/rsync/S3) before encryption; branded leak site threats.
• Fast lock mode: multi-threaded encryption with partial file “salting” for speed; shadow copy/wbadmin tamper; service kill lists.
• AD-aware: domain discovery, share crawling, Group Policy abuse; RDP spread and PsExec/WMIC for push.

Initial Access & Lateral Movement

• Entry: phishing with credential theft, exposed VPN w/o MFA, RDP on WAN, web-app exploits in edge services.
• Post-auth: token theft, AD enumeration, LSASS dump; password spray; living-off-the-land with psexec, wmic, certutil, bitsadmin, mshta, rundll32, powershell.
• Exfil: compress + stage (rar/7z/tar), then exfil to attacker storage; disable AV/XDR if unprotected.

ESXi Playbook: From Host Access to Mass Encryption

1. Obtain shell via SSH or DCUI creds; enumerate /vmfs/volumes, list VMs with vim-cmd vmsvc/getallvms.
2. Graceful stop or power-off VMs for file access; kill agents (hostd, vpxa) if needed.
3. Encrypt .vmdk, .vmx, .vmsn selectively; delete snapshots and backups to speed impact.
4. Drop ransom note on datastores; disable SSH or change root password to slow IR.

Detections & Hunt Queries

Windows (EDR/Sysmon):

• Mass file rename/write spikes; unusual CPU + I/O from non-signed binaries.
• Event IDs: 4688 (suspicious cmdlines), 4624/4625 (spray), 4672 (privileged logons), Sysmon 1/10/11/13/15.
• Command-line flags: -enc, --threads, references to wbadmin/vssadmin/bcdedit.

Linux:

• New ELF in /tmp, /dev/shm; curl|wget to first-seen domains; chattr +i on notes.
• Auth spikes in /var/log/auth.log, new sudoers, SSH from unusual ASN.

ESXi:

• Unusual SSH logins; vim-cmd driven mass power-offs; snapshot deletions; spikes in hostd.log/vpxa.log.
• Large sequential writes on datastores; modified .vmdk headers.

Mitigation & Hardening Checklist

• Identity/MFA: Enforce MFA for VPN, RDP, vCenter, ESXi shell/DCUI, backups, and all admin panels.
• Exposure kill: Block RDP on WAN; geofence admin endpoints; require VPN with device posture.
• EDR/XDR: Enable ransomware shields; kill switch for mass-encrypt patterns; isolate on rule hit.
• Backups: Run immutable/offline; test restore; segregate backup credentials and networks.
• ESXi hardening: Lockdown Mode, disable SSH by default, strict RBAC, rotate creds, enable FIPS/TLS1.2+, segment management VLANs.
• Windows hardening: Disable PowerShell v2; block LOLBins by policy; ASR rules for credential theft.
• Network: Egress allow-list; DNS/TLS inspection for first-seen domains; SMB signing; micro-segmentation.

72-Hour IR & Recovery Plan

1. 0–6h: Change-freeze, asset census (DCs, ESXi, gateways), cut exposure, push EDR rules, snapshot gold systems.
2. 6–24h: Patch edge services, rotate privileged creds, hunt for notes/webshells, quarantine suspect hosts.
3. 24–48h: ESXi review (logs, snapshots), restore from clean backups, rebuild compromised IAM secrets.
4. 48–72h: Validate operations, customer comms, finalize executive report, backlog: hardening + tabletop.

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Alibaba Cloud (Global)
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CyberDudeBivash Services & Apps

Need help now? We deliver RaaS takedown hunts, ESXi hardening, EDR rule-packs, credential rotation, and executive reporting — 24×7.

• PhishRadar AI — tracks initial access via phishing/QR & agent abuse
• SessionShield — protects privileged sessions, tokens & remote admin
• Threat Analyser GUI — live dashboards, IOC hunts & IR readiness

Explore Apps & ProductsBook Ransomware Readiness SprintSubscribe to ThreatWire

FAQ

Q: Should we pay the ransom?
A: We advise against paying; focus on containment, forensics, clean restore, and law-enforcement coordination.

Q: Are ESXi hosts the main target?
A: They’re high-value for blast radius. Harden hypervisors and isolate management networks immediately.

Q: What’s the fastest win right now?
A: Kill external RDP/VPN without MFA, push EDR anti-ransom rules, validate offline backups, and rotate privileged credentials.

Next Reads

• Daily CVEs & Threat Intel — CyberBivash
• CyberDudeBivash Apps & Services Hub

Affiliate Disclosure: We may earn commissions from partner links at no extra cost to you. Opinions are independent.

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