The Shinra v3 (.qPUvslnc) Variant: A Definitive Forensic Recovery Guide

In our recovery lab today at Lockbit Decryptor, we isolated a Shinra v3 ransomware sample using the random 9-character extension .qPUvslnc. Our forensic analysis confirms this variant continues the family’s trend of combining robust cryptography with flawed implementation. Specifically, it uses AES-256 for file encryption protected by RSA-2048, but suffers from a predictable nonce generation vulnerability that compromises the integrity of the entire encryption scheme.

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EMERGENCY TRIAGE (THE GOLDEN HOUR)

If you are observing the .qPUvslnc extension on your file servers, execute these 4 steps immediately to halt progression:

1. Network Segmentation: Sever all TCP ports 135, 139, 445, and 3389. Shinra v3 relies heavily on SMB and RDP for lateral movement after gaining an initial foothold.
2. Hypervisor Isolation: Suspend all active VMs on ESXi and Hyper-V hosts. Acquiring a live memory dump is crucial for locating the symmetric keys before they are purged from RAM.
3. Domain Controller Securement: Forcefully reset all Kerberos tickets and change the KRBTGT account password twice to invalidate any golden tickets the actors may have created.
4. Backup Integrity Verification: Validate recent backups. Confirm they are offline and have not been touched or tampered with during the intrusion window.

Also read: The Exitium (.exitium) Ransomware Recovery and Decryption Options

THREAT PROFILE & FORENSICS

Technical Specifications:

File Extension Examples:

• Production.mdf.qPUvslnc
• Quarterly_Report.xlsx.qPUvslnc
• VM_Image_Delta.vhdx.qPUvslnc
• client_database.zip.qPUvslnc

Persistence Markers:

• Registry Run Keys: Creates entries under HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\Run with GUID-named values pointing to the payload in %AppData%.
• Service Installation: Deploys a service with a randomized name set to automatic startup to maintain persistence.
• Virtualization Artifacts: Actively seeks out and modifies .vmxf and .nvram files on ESXi hosts to deploy its Linux-based encryptor.

Ransom Note Text:

"*Your Files Are Securely Encrypted*
Dear Administrator,
Unfortunately, your network had security vulnerabilities that allowed us access.
Your files are now encrypted with military-grade encryption –they are safe and undamaged, but inaccessible without our private key.
...
Your Unique ID: 90DC318E80CC1D5285DAA6F81B3D0AD6
Contacts:
Email 1: opnrdp@firemail.de
Email 2: Rdpdik35@gmail.com
...
Important Advice (From Experience):
- Do not attempt recover yourself or use third-party tools – this risks permanent data corruption...

MATHEMATICAL VULNERABILITY ANALYSIS

Shinra v3 employs a hybrid cryptosystem. Per-file data is encrypted using AES-256 in Counter (CTR) mode. The formula is:

$$C_i = P_i \oplus E_K(Nonce || i)$$

Where $Nonce$ is a unique number per file, $i$ is the counter block index, and $K$ is the AES key. This $K$ is then encrypted with the actors’ RSA-2048 public key.

Critical Implementation Flaw:
Our laboratory identified a Predictable Nonce Generation flaw. Instead of using a cryptographically secure random source, the malware derives the nonce for each file from a combination of the filename hash and a global counter initialized at runtime. This makes the nonce series computationally guessable. With two or more encrypted files of sufficient size, Lockbit Decryptor can launch a Known-Plaintext Attack (KPA) by guessing common file headers (e.g., PKZIP for office docs, \xD0\xCF\x11\xE0 for older Office files). By comparing the predicted keystream with the actual ciphertext, we can isolate the variable component and subsequently compute the AES key, bypassing RSA entirely.

IT ADMIN TOOLKIT (POWERSHELL AUDIT)

Execute this script to enumerate indicators of compromise (IOCs) associated with this Shinra v3 campaign.

# Lockbit Decryptor Audit Script for Shinra v3 (.qPUvslnc)
Write-Host "Initiating IOC Scan for Shinra v3..." -ForegroundColor Yellow

# 1. Detect Randomized Services Installed Recently
Get-CimInstance -ClassName Win32_Service | Where-Object {
    ($_.State -eq 'Running') -and 
    ($_.StartTime -gt (Get-Date).AddDays(-3)) -and
    ($_.PathName -match '%AppData%' -or $_.DisplayName -notmatch '^[a-zA-Z]')
} | Select-Object Name, DisplayName, PathName, ProcessId, State

# 2. Locate Ransom Notes and Specific Extension
Get-ChildItem -Path C:\ -Filter '*.qPUvslnc' -Recurse -Force -ErrorAction SilentlyContinue -Depth 3 | 
Select-Object -First 100 FullName, LastWriteTimeUtc

Get-ChildItem -Path C:\ -Filter 'HowToRecover.txt' -Recurse -Force -ErrorAction SilentlyContinue -Depth 3 | 
Select-Object FullName, CreationTimeUtc

# 3. Scrub Registry Run Policies for Payload Paths
Invoke-Command {
    New-PSDrive -PSProvider Registry -Root HKLM -Name HKLM
    Get-ItemProperty -Path "HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\Run" -ErrorAction SilentlyContinue | 
        Select-Object -ExpandProperty Property | ForEach-Object {
            Write-Output "$_`: $(Get-ItemPropertyValue -Path 'HKLM:\...\Run' -Name $_)"
        }
}

RECOVERY PATHWAYS & CTA

Contrasting Recovery Strategies:

• Professional Key Reconstruction: Lockbit Decryptor leverages the Predictable Nonce flaw. Through computational analysis of the encrypted fileset, we reliably reconstruct the AES keys, achieving total decryption without engaging the adversaries.
• Forensic Memory Acquisition: If a live memory dump was captured during triage, our lab can extract the AES keys directly from the process space, providing an alternative recovery path.
• Public Resources: There are no free or public decryptors for Shinra v3. The complexity of the attack exceeds the capabilities of volunteer projects.
• FINAL RECOMMENDATION: Refrain from contacting opnrdp@firemail.de or Rdpdik35@gmail.com. Negotiations fund illicit activities and offer no guarantee of success. Their warnings about data corruption are calculated misinformation. Submit a case to Lockbit Decryptor for expert analysis and guaranteed, silent restoration of your SQL databases (.mdf), virtual disks (.vhd, .vhdx, .vmdk), and all other mission-critical assets.

Also read: The MedusaLocker (“.bear”) Variants: A Definitive Forensic Recovery Guide

Frequently Asked Questions (FAQ)

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