The Uragan (.uragan) Variant: A Definitive Forensic Recovery Guide

In our recovery lab today at Lockbit Decryptor, we isolated the Uragan ransomware strain. Our analysis confirms this is not a sophisticated enterprise threat but a variant of the open-source Chaos ransomware. This variant uses a stream cipher with a hard-coded key and appends the .uragan extension. Despite its aggressive ransom note and threats of data leakage, the encryption is fundamentally broken and allows for complete file recovery without any actor interaction.

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EMERGENCY TRIAGE (THE GOLDEN HOUR)

If you are observing the .uragan extension on your systems, execute these 4 steps immediately:

1. Network Segmentation: Immediately sever all SMB (TCP 445) and RDP (TCP 3389) connections to prevent the simple script from spreading to other accessible shares.
2. Process Termination: Identify and terminate the ransomware process. It is often a single .exe file with a randomized name running under the user’s context.
3. Malware Removal: Scan the affected system with a reputable antivirus solution to remove the initial dropper and any secondary payloads.
4. Credential Flush: While this variant does not typically steal credentials, it is good practice to rotate passwords for any accounts that were logged in during the infection.

Also read: The SurfLocker (.SURF) Variant: SurfLocker Decryptor and Recovery

THREAT PROFILE & FORENSICS

Technical Specifications:

File Extension Examples:

• database.sql.uragan
• report.pdf.uragan
• financial.xlsx.uragan
• image.jpg.uragan
• document.docx.uragan

Persistence Markers:

• Windows Registry: The malware may establish persistence via HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\{Random_GUID}.
• Startup Folder: A copy of the executable may be placed in the user’s Startup folder (%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup).
• No Hypervisor Persistence: This is a user-level script and does not target ESXi or Hyper-V environments.

Ransom Note Text:

Good day!

We have encrypted your infrastructure.
All servers and workstations are unavailable, and backups have also been affected.

We have the keys and decryptor, and we are ready to provide them to you, but only upon prepayment.

Decryption will not be performed without payment.

If you refuse or try to stall, all information will be sent to the tax authorities, the Federal Security Service, and the police, and will also be published.

We can also share your combinations and information about people in your network.

We will work with your clients and partners separately.

Contact:
Outlook: fredoms_docktor@outlook.com

We await your response.

MATHEMATICAL VULNERABILITY ANALYSIS

The Uragan variant uses a simple stream cipher for encryption. The encryption process for a plaintext byte $P_i$ and a key byte $K_j$ is:

$$C_i = P_i \oplus K_j$$

Where $C_i$ is the ciphertext byte and the key $K_j$ is repeated cyclically.

Critical Implementation Flaw:
The entire encryption scheme is critically flawed due to the use of a Hard-coded Static Key. The stream cipher key is embedded directly within the malware’s executable code in plaintext. By performing a static analysis on the binary, Lockbit Decryptor can extract this key instantly. Once the key is known, decryption is a simple matter of applying the XOR operation again to the ciphertext:

$$P_i = C_i \oplus K_j$$

This allows for the complete and instantaneous recovery of all encrypted files. In some Chaos variants, the encryption is so flawed that files are merely corrupted and not encrypted at all, allowing for manual restoration by removing the extension.

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 Uragan Variant
Write-Host "Scanning for .uragan 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 .uragan Extensions and Ransom Notes
Get-ChildItem -Path "C:\" -Filter "*.uragan" -Recurse -ErrorAction SilentlyContinue -Depth 3 | 
    Select-Object FullName, Length, CreationTime

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

RECOVERY PATHWAYS & CTA

Recovery Options:

• Professional Key Extraction & Decryption: Lockbit Decryptor can extract the static stream cipher key from the malware binary and use it to decrypt all files instantly.
• Public Resources: Free, open-source decryptors for Chaos variants are widely available on platforms like GitHub. Any tool capable of analyzing the binary can extract the key.
• Manual File Restoration: For some Chaos builds, simply removing the .uragan extension may be enough to restore file functionality, as the encryption process may have failed.
• Final Recommendation: Do not contact fredoms_docktor@outlook.com. This is a low-skill attack using a well-known, broken encryption scheme. Their threats of data leakage are often baseless, as the actors lack the sophistication for true data exfiltration. Paying is unnecessary. Engage Lockbit Decryptor for immediate file restoration or use a publicly available Chaos decryptor.

Also read: The Eraleign (APT73) ‘Bashe’ Variant: A Definitive Forensic Recovery Guide

Frequently Asked Questions (FAQ)

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