.RPC Ransomware: Decrypting Infected Hyper-V VHDX Virtual Machine Disk Files

Service Description

.RPC ransomware decryption, server infection decryption, .RPC Hyper-V virtual machine recovery, virtual machine VHDX disk file infection and .RPC decryption.

This case involves professional recovery of a Hyper-V virtual machine environment after infection by the rare .RPC ransomware, which encrypted virtual disk files and rendered the system unusable.

Incident Summary

The server was infected with .RPC ransomware, causing all files to be encrypted and their extensions changed to .RPC. As a result, the Hyper-V virtualization environment could not start normally, and the virtual machines became inaccessible.

Analysis showed that the ransomware variant was relatively rare, requiring specialized handling. The recovery task focused on restoring the VHDX and AVHDX virtual disk files used by the Hyper-V virtual machines.

Technical Analysis

During the analysis phase, engineers determined that:

The .RPC ransomware encrypted specific data blocks within the virtual disks

Core VHDX and AVHDX structures remained partially intact

Correcting the encrypted blocks could restore full disk integrity

Direct mounting and boot-level recovery were feasible

This allowed for a targeted repair approach instead of risky full-file decryption.

Recovery Solution

The recovery process involved correcting the encrypted blocks within the Hyper-V virtual disk files and repairing the VHDX and AVHDX structures.

After repair, the virtual disks were either directly mounted or booted through Hyper-V, allowing the system to recognize and use the restored virtual machines normally.

Recovery Process

Ransomware Behavior Analysis: Identification of encrypted block locations caused by .RPC ransomware.

Virtual Disk Structure Repair: Correction of encrypted blocks within VHDX and AVHDX files.

Disk Mounting & Boot Validation: Virtual disks were mounted directly and tested through Hyper-V startup.

Integrity Verification: Data integrity and virtual machine functionality were fully verified.

Recovery Results

Recovery Integrity: 100%

Recovered Files: Hyper-V VHDX and AVHDX virtual disk files

System Status: Virtual machines boot normally after repair

Total Recovery Time: 1 hour

The files on the Hyper-V virtual machine disks infected by the .RPC ransomware were fully restored with complete data integrity.

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