A backup encrypted by ransomware means that critical data, stored to ensure a company’s operational continuity, has been encrypted by cybercriminals. In practice, this completely blocks access to the stored information, making conventional data recovery impossible. Ransomware has become a particularly effective threat, as many companies rely heavily on these backups to quickly restore operations in the event of incidents or technical failures.
With the increasing sophistication of attacks, backups are no longer as secure as they once were. Many ransomware variants have advanced capabilities to detect, infiltrate and encrypt a company’s own backups, eliminating the primary means of data recovery and leaving organisations in critical situations.
In this context, it is crucial to act swiftly using specialised strategies and targeted techniques that not only enable the recovery of encrypted backups, but also ensure minimal disruption to operations. Throughout this article, we will present effective methods for identifying and recovering backups encrypted by ransomware, helping your organisation to restore functionality quickly, securely, and without further loss.
How does ransomware reach and compromise backups?
Hackers, when developing new variants of ransomware, are increasingly focusing on encrypting corporate backups. This has become a common strategy due to its proven effectiveness in completely disabling a company’s recovery options.
The main techniques used by attackers include:
- Targeted attacks on backup servers:
Cybercriminals attempt to gain access to servers where backups are stored, particularly if they are kept online. Once accessed, the backups are quickly encrypted or deleted. - Exploitation of backup software vulnerabilities:
Outdated and vulnerable software becomes an open door for ransomware. Hackers exploit these known vulnerabilities to gain direct access to systems. - Attacks via compromised credentials:
The theft of administrative credentials, often obtained through phishing attacks or leaked credentials, allows ransomware to gain privileged, unrestricted access to backup storage. - Lateral movement within the network:
Once ransomware infiltrates a system, it quickly spreads to other areas of the infrastructure, reaching servers and devices where backups are stored—such as NAS, SAN, or dedicated servers. This tactic is known as lateral movement.
These techniques clearly demonstrate how ransomware can compromise your company’s data recovery strategy. Without reliable backups, operational downtime can extend for days or even weeks, significantly increasing both operational and financial losses.
It is essential to understand these methods in order to develop effective strategies not only for recovery, but also for protection and future prevention.
Identifying an encrypted backup
Quickly identifying that a backup has been encrypted by ransomware is crucial to minimising damage and immediately initiating an effective recovery process. The longer detection takes, the greater the operational, financial, and reputational impact on the business.
There are several clear signs that your backup may have been compromised:
- Changed file extensions:
One of the first observable signs is the modification of original file extensions to unusual formats (such as “.encrypted”, “.lockbit”, or “.conti”)—a common indicator of a ransomware attack. - Ransom notes:
Typically, after encryption, ransomware leaves behind notes or text messages with instructions on how to pay the ransom. If you notice unusual files or messages on your server or in backup folders, it is a strong indicator that the system has been compromised. - Unexpected errors during backup restoration:
If attempts to recover data from backups result in unexplained errors and restoration is not possible, this is a strong indication that the backups may have been encrypted or corrupted during the attack. - Security alerts and unauthorised access:
A sudden increase in security alerts or unauthorised access attempts—particularly from unfamiliar IP addresses—can also indicate that your backups have been compromised.
How to act immediately after identification?
As soon as you identify that the backups have been compromised:
- Immediately isolate the affected environment to prevent the ransomware from spreading further across the network and compromising other critical systems.
- Quickly contact a specialised team, such as Digital Recovery, to carry out an initial technical assessment and define immediate recovery strategies.
- Never attempt to pay the ransom, as it does not guarantee data recovery and may expose your company to further, more targeted attacks.
Acting quickly and relying on expert support is essential to ensure your backups are recovered, significantly reducing your company’s downtime.
Effective strategies for recovering encrypted backups
When a backup is encrypted by ransomware, traditional recovery methods often become ineffective, requiring advanced and tailored technical strategies. Digital Recovery uses proven methods and specialised tools capable of recovering compromised backups, even in the most critical situations.
The main steps and methods used by Digital Recovery include:
Initial assessment and containment of the attack
Before beginning the recovery process, it is essential to carry out a detailed technical analysis to understand the extent of the encryption and identify which backups have been affected. This stage includes:
- A full assessment of the damage caused by the ransomware.
- Isolation of compromised systems to prevent further spread.
- Detailed technical analysis to determine which ransomware variant was used, allowing for the selection of the most effective recovery method.
Advanced technical methods for backup recovery
After the initial assessment, specialised techniques are applied, such as:
- Partial or full decryption:
Using proprietary tools and processes developed by Digital Recovery’s security team, it is possible to decrypt backup files and restore access to the originally stored data. - Recovery through reverse engineering:
Specialists analyse the behaviour of the ransomware and, through reverse engineering, are able to recover critical portions of the compromised backups without the need to pay any ransom. - Hex-level recovery (raw recovery):
In more complex cases, Digital Recovery uses advanced tools that allow data to be recovered directly at the hexadecimal level, bypassing encryption and ensuring efficient restoration.
Specialised tools used by Digital Recovery
Digital Recovery has developed proprietary technologies that enable the recovery of backups encrypted by various ransomware variants. Key tools include:
- Proprietary decryption solutions:
Advanced software capable of recovering data from backups affected by ransomware, even in highly complex cases. - Advanced data recovery laboratory:
Equipped with cutting-edge technology and advanced resources, ensuring maximum efficiency and security throughout the backup recovery process.
These strategies ensure a technically effective recovery, significantly reducing operational downtime and helping your business resume operations quickly.
Conclusion
Backups encrypted by ransomware represent one of the most critical challenges faced by businesses today. Without access to these backups, the entire operational continuity is jeopardised, putting not only financial stability but also the organisation’s reputation at risk.
Digital Recovery offers an effective, agile, and specialised response. With its proprietary technologies and a team of experts ready to act immediately, compromised backups can be recovered quickly, securely, and efficiently.
