PROXMOX VM BACKUP
Is your Proxmox VE backup encrypted after a ransomware attack?
Even when a Proxmox VE backup can no longer be restored after a ransomware attack, SOS RANSOMWARE steps in to analyze, reconstruct, and recover your company's priority data. Our R&D engineers use advanced methods to analyze Proxmox VE backups, identify data blocks that are still recoverable, and reconstruct the critical files required to resume business operations.
Client case: SME based in Lyon, France
Discover how sosransomware.com recovered priority data from several Proxmox VE backups that had become unusable following a ransomware attack.
An SME based in Lyon, France, contacted us through SOS RANSOMWARE after a ransomware attack made several Proxmox VE backups impossible to restore.
The affected backups represented a total volume of 2.2 TB and consisted of the following files:
vzdump-qemu-100-2026_04_15-09_58_23.vma.zstvzdump-qemu-101-2026_04_15-09_58_23.vma.zst
Following the attack, the files had been renamed by the ransomware:
vzdump-qemu-100-2026_04_15-09_58_23.vma.zst.RtGjki1_jvzdump-qemu-101-2026_04_15-09_58_23.vma.zst.RtGjki1_j
Total volume analyzed: 2.2 TB
Client objective: recover the virtual machines and priority files contained in the Proxmox VE backups.
Secure transfer of Proxmox VE backups
From the very first contact, our specialists carry out a comprehensive assessment of the situation in order to:
- Identify the source of the problem.
- Assess the actual condition of the Proxmox VE backups.
- Determine the technical recovery options.
- Identify the company’s priority data.
To facilitate the secure transfer of the data, our team set up a secure FTP space, allowing the client to send us all the affected backups.
Once all the files had been received, our engineers carried out an initial technical analysis to assess their condition.
Standard restoration impossible
An initial attempt was made to open the Proxmox VE backups using standard restoration methods.
The software returned an error message confirming that the backups could no longer be used with conventional restoration procedures.
The virtual machines had become inaccessible using standard restoration tools.
Advanced technical analysis and data reconstruction
As standard recovery methods could not be used, the analysis was entrusted to our R&D engineering team specializing in post-ransomware data recovery.
The initial checks revealed that:
- Approximately 28% of the analyzed segments contained incomplete structures or unreadable data blocks.
- A significant portion of the internal data blocks remained recoverable.
- Reconstruction of the virtual machines could therefore be initiated.
Our engineers performed a complete mapping of the backups to isolate the data blocks that were still readable.
An initial extraction of the recoverable data produced encouraging results. A technical discussion with the client then helped identify an additional data source that could further improve the recovery rate.
The Lyon-based company then provided us with a production virtual machine to complete the analysis.
By cross-analyzing the different available data sources and using specialized tools developed by SOS RANSOMWARE, our engineers were able to reconstruct almost all of the data.
Results achieved: 100% of priority files recovered
After reconstructing the recoverable structures, the following results were confirmed with the client:
Recovery results
- Initial volume analyzed: 2.2 TB
- Recoverable volume reconstructed: 2.1 TB
- Overall recovery rate: 99%
- Priority files recovered: 100%
- Client validation: 100%
Despite the ransomware encryption that had rendered the Proxmox VE backups unusable, all priority files were successfully recovered and validated.
Validation of recovered data
For File Server data, the client was provided with secure access to our DiagView platform.
This step allowed the client to:
- Review the recovered files.
- Verify their content.
- Check the priority data.
- Validate the results before final delivery.
Data delivered within 72 hours
After final validation via DiagView:
- The recovered data was transferred via secure FTP.
- The data was returned according to the agreed procedure.
- The restored files were delivered within 72 hours.
This intervention enabled the Lyon-based company to quickly regain access to its virtual machines and resume operations following the ransomware attack.
Our Recovery Process for Proxmox VE Backups
Contact & Qualification Call
Advanced Diagnosis
Fixed Quote
Recovery
File Listing & Validation
Secure Data Return
Why choose SOS RANSOMWARE to recover your Proxmox VE backup?
With over 250 ransomware cases handled, we have adapted our tools and processes to achieve successful recovery results.
Since 2019, we have been developing tools specifically designed for post-ransomware data recovery.
Our emergency response team is available 24/7. Our software and servers are regularly updated to speed up our recovery process.
We offer a free analysis of a file of your choice (VM, backup, or database) to demonstrate our expertise. Simply send it to us.
How quickly do you need your data back?
We offer flexible service options to meet your specific needs and budget requirements.
On-call service
24/7/365
Dedicated team
Average turnaround time: 1–3 business days
Priority processing during business hours
1 dedicated engineer
Average turnaround time: 3–7 business days
Processing during business hours
1 shared engineer
Average turnaround time: 7–14 business days
Témoignages
Success stories
Une sauvegarde ACRONIS cryptée par un ransomware
Un agent immobilier nous contacte après avoir été crypté par un groupe de ransomware.
Ils nous fournissent donc un fichier .TIB de 4 TO.
Nous constations que le chiffrement a touché tous les débuts de fichiers à hauteur de 8 Go.
Heureusement, ils ont coupé le NAS au début de l’attaque. Il ont retiré le disque système du NAS. 4 répertoires seulement sont manquants. Une société de récupération de données fera donc des recherches de fichiers supprimés mais tous fichiers retrouvés sont corrompus.
Nous analysons donc la structure et la compression des fichiers.
Nous avons pu récupérer 95 % des données sur ce dossier.
Une sauvegarde TIBX échoue en raison d'une erreur d'E/S.
Le prestataire IT nous envoie un disque dur qui contient des fichiers de sauvegardes TIBX. Le logiciel indique une erreur “Data error (cyclic redundancy check)” .
Ce message d’erreur indiqu’il y a des erreurs physique sur le disque. Nous procédons donc à un clonage du disque. Le fichier SPF ne fonctionne pas. Il y a des erreurs : il est corrompu.
Nous récupérons plus de 90 % des données malgré les erreurs.
Request an Evaluation
Once we receive your request, we will arrange a technical call with our engineers.
FAQ
Frequently Asked Questions
Everything you need to know about database data recovery services.
Database data recovery is a technical process used to restore information stored in a database or backup that has become inaccessible, corrupted, or damaged.
Following a ransomware attack, this process involves analyzing the internal data structures to identify recoverable elements, reconstruct files, and restore the priority information required for business continuity.
Yes. Even when a Proxmox VE backup can no longer be restored using standard tools, our engineers analyze the backup files to identify recoverable data blocks and reconstruct the virtual machines and usable data.
Il est recommandé de contacter rapidement nos équipes après la découverte d'une attaque ransomware afin de préserver les meilleures chances de récupération.
Une analyse technique permet d'évaluer l'état des sauvegardes et de définir la stratégie de récupération la plus adaptée.