Service Description

Ransomware decryption, server infection decryption, [email protected] ransomware recovery, Hyper-V virtual machine recovery, VHDX disk file infection and [email protected] decryption.

This case documents the successful recovery of a Hyper-V virtual machine environment after infection by the [email protected] ransomware, which encrypted virtual disk files and critical business data.

Client & Data Information

• Client Name: Confidential

• Data Type: Hyper-V virtual machine, VHDX / AVHDX virtual disk files

• Data Capacity: 500 GB

• Ransomware Identifier: [email protected]

Incident Summary

The server was encrypted by the [email protected] ransomware, resulting in all files being encrypted and their file extensions changed to [email protected]. This rendered the Hyper-V virtual machines inaccessible and prevented normal system startup.

The primary recovery task was to restore the U8 database stored inside the Hyper-V virtual machine’s VHDX virtual disk file, while preserving full data integrity.

Technical Analysis

Analysis revealed that this ransomware variant was relatively rare, but its encryption method allowed for high-integrity repair when handled correctly. The investigation determined that:

• Encrypted blocks were present within the VHDX and AVHDX virtual disk files

• Core virtual disk structures remained intact

• Targeted block correction could restore full usability

• Direct Hyper-V restart after repair was feasible

This made a precise repair approach possible without destructive decryption attempts.

Recovery Solution

The recovery process focused on correcting the encrypted blocks inside the Hyper-V virtual disk files and restoring the integrity of the VHDX and AVHDX structures.

After repair, the virtual machine was restarted in the Hyper-V environment, allowing the operating system and the U8 database to be accessed normally.

Recovery Process

• Ransomware Behavior Analysis: Identification of encrypted blocks caused by [email protected] ransomware.

• Virtual Disk Block Repair: Correction and reconstruction of encrypted blocks within VHDX and AVHDX files.

• Virtual Machine Restart: Hyper-V virtual machine was booted using the repaired disk files.

• Database Validation: U8 database integrity and accessibility were verified.

Recovery Results

• Recovery Integrity: 100%

• Recovered Data: Hyper-V VHDX / AVHDX virtual disk files and U8 database

• System Status: Virtual machine restarted and operates normally

• Total Recovery Time: 1 hour

The Hyper-V virtual machine disk files damaged by the [email protected] ransomware were fully recovered, and all data was restored successfully.