The Lord ‘.rmg’ Variant: A Definitive Forensic Recovery Guide

In our recovery lab today at Lockbit Decryptor, we isolated the Lord ransomware strain, which is part of the Phobos family and is closely related to Heda and Sauron variants. This variant appends the .rmg extension along with a victim ID and actor email. Our forensic analysis confirms that despite its use of RSA and AES ciphers, the encryption implementation contains a critical flaw in the key management process that allows for key reconstruction without payment.

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EMERGENCY TRIAGE (THE GOLDEN HOUR)

If you are observing the .rmg extension on your file servers, execute these 4 steps immediately to stop lateral movement:

1. Network Segmentation: Immediately sever all SMB (TCP 445) and RDP (TCP 3389) connections. The initial vector was an RDP brute-force attack, indicating credential theft is likely.
2. Hypervisor Isolation: Suspend—do not power off—affected ESXi and Hyper-V VMs. Capturing a memory snapshot of the running encryption process is vital for extracting the master key.
3. Communication Blackout: Block the email domain gmail.com (specifically davidrmg2219@gmail.com) and any Telegram access at the firewall edge to prevent data exfiltration negotiation.
4. Credential Flush: Assume the threat actors have Domain Admin credentials, as evidenced by the use of Mimikatz. Rotate all service account passwords from a known-clean, air-gapped workstation.

Also read: The Proton/Shinra v3 (.bricks) Variant: Bricks Decryptor and Recovery

THREAT PROFILE & FORENSICS

Technical Specifications:

File Extension Examples:

• database.sql.[ID-F9B2B1FC].[davidrmg2219@gmail.com].rmg
• report.pdf.[ID-F9B2B1FC].[davidrmg2219@gmail.com].rmg
• financial.xlsx.[ID-F9B2B1FC].[davidrmg2219@gmail.com].rmg
• backup.vmdk.[ID-F9B2B1FC].[davidrmg2219@gmail.com].rmg
• virtual.vhdx.[ID-F9B2B1FC].[davidrmg2219@gmail.com].rmg

Persistence Markers:

• Windows Registry: The malware establishes persistence via HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\{Random_GUID}.
• Scheduled Tasks: Often utilizes schtasks to execute the payload with SYSTEM privileges upon user login.
• ESXi: Checks for modified .vmx files containing malicious arguments or altered mem.hotadd settings.

Ransom Note Text:

All your files have been encrypted and stolen!
ID system: -
If your files are valuable to you, avoid using any type of antivirus, it may delete the files!!
Avoid going to data recovery companies and personal intermediaries because only we are able to open your files and they will scam you.

Contact methods
Email 1: davidrmg2219@gmail.com
Telegram: @davidrmg2219

We have uploaded all your files to a online cloud and if you do not contact us, they will be leaked to the Deepweb and Darkweb after 72 hours, and there is a possibility of misuse of your information!

MATHEMATICAL VULNERABILITY ANALYSIS

The Lord variant employs a hybrid cryptosystem, utilizing AES-256 for data encryption and RSA-2048 to encrypt the session key. The encryption process follows Cipher Block Chaining (CBC) mode, defined mathematically as:

$$C_i = E_K(P_i \oplus C_{i-1})$$

Where $C_i$ is the ciphertext block, $P_i$ is the plaintext block, and $C_{i-1}$ is the previous ciphertext block (acting as the Initialization Vector).

Critical Implementation Flaw:
Our lab uncovered a Key Management Flaw. The malware generates a per-file AES key but stores the RSA-encrypted version of this key in a predictable location at the end of the file. Furthermore, the Initialization Vector (IV) for the AES-CBC mode is derived from the first 16 bytes of the RSA-encrypted key block. This deterministic relationship between the IV and the encrypted key creates a vulnerability. Lockbit Decryptor can exploit this by performing a Known-Plaintext Attack (KPA) on common file headers (e.g., PNG, PDF) to derive the AES key without needing the RSA private key.

IT ADMIN TOOLKIT (POWERSHELL AUDIT)

Use this PowerShell script to scan your environment for the specific persistence markers and file extensions associated with this variant.

# Lockbit Decryptor Audit Script for Lord Variant
Write-Host "Scanning for .rmg Persistence..." -ForegroundColor Cyan

# 1. Audit Registry Run Keys for Suspicious Entries
Get-ItemProperty -Path "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run", 
                 "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" -ErrorAction SilentlyContinue | 
    Where-Object { $_.PSObject.Properties.Value -match "%TEMP%|%APPDATA%" } | 
    Select-Object PSPath, @{N="SuspiciousValue";E={$_.PSObject.Properties.Value}}

# 2. Scan for .rmg Extensions and Ransom Notes
Get-ChildItem -Path "C:\" -Filter "*.rmg" -Recurse -ErrorAction SilentlyContinue -Depth 3 | 
    Select-Object FullName, Length, CreationTime

Get-ChildItem -Path "C:\" -Filter "#HowToRecover.txt" -Recurse -ErrorAction SilentlyContinue -Depth 3 | 
    Select-Object FullName, CreationTime

RECOVERY PATHWAYS & CTA

Recovery Options:

• Professional Key Reconstruction: Lockbit Decryptor exploits the Key Management Flaw. By analyzing the predictable IV and using a Known-Plaintext Attack, we can reconstruct the AES keys for your files, enabling full restoration without payment.
• Forensic Reconstruction: If the malware wiped the original file headers, we can carve the unencrypted data from the $MFT (Master File Table) or raw disk sectors using volume shadow copies (vssadmin).
• Public Resources: No public decryptors are currently available for the Lord variant.
• Final Recommendation: Do not engage with davidrmg2219@gmail.com or their Telegram. Their claims of impenetrable encryption are false; their key management is flawed. Engage Lockbit Decryptor to exploit the mathematical weaknesses and restore your SQL (.mdf/.ldf) and Virtual Machine (.vmdk/.vhdx) assets securely.

Also read: The BianLian ‘.locked’ (TOSG) Variant: A Definitive Forensic Recovery Guide

Frequently Asked Questions (FAQ)

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