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A ransomware attack can leave files encrypted, applications unavailable, and critical business operations at a standstill. For organizations that rely on digital data, the immediate concern is often how to restore access without losing important information or exposing systems to another attack.
So, how can you recover data after a ransomware attack?
In most cases, the safest approach is to contain the attack, identify a clean recovery point, and restore data from a verified backup. Depending on the ransomware variant and available recovery resources, decryption tools or other recovery methods may also be an option.
In this guide, we’ll walk through the steps to take after an attack, explain the available data recovery methods, and discuss how businesses can improve their ability to recover from future ransomware incidents.
Ransomware is a type of malicious software that prevents users from accessing their data, usually by encrypting files and demanding payment for a decryption key.
However, encryption is not the only risk businesses need to consider.
During an attack, cybercriminals may also:
Encrypt critical files: Documents, databases, virtual machines, and other business data may become inaccessible.
Delete or damage backups: Attackers may target backup servers and recovery systems to make restoration more difficult.
Steal sensitive information: Some ransomware groups copy confidential data before encrypting systems and threaten to publish it if the victim refuses to pay.
Disrupt business applications: Servers, databases, and other essential services may become unavailable, affecting daily operations.
This means recovering from ransomware is not simply a matter of unlocking encrypted files. We also need to consider whether the recovered data is clean, whether the attack has been contained, and whether the affected systems can safely return to production.
Before attempting to recover any data, we recommend taking several steps to prevent further damage.
Restoring files too early, while attackers still have access to the network, can put newly recovered data at risk.
The first priority is to stop the attack from spreading.
Disconnect affected computers and servers from the network. This may involve disabling network connections, isolating affected devices, or restricting access between network segments.
However, avoid immediately shutting down or restarting every affected system. Doing so may destroy valuable forensic evidence or interfere with incident investigation. Follow the guidance of your incident response team when deciding how to handle compromised devices.
For additional guidance on responding to ransomware incidents, refer to the CISA StopRansomware Guide.
Next, determine which systems and data have been affected.
We recommend checking:
Which servers, workstations, and virtual machines show signs of infection?
Are business-critical databases or applications affected?
Have backup servers or storage systems been compromised?
Are there signs of unauthorized access or data exfiltration?
Could compromised user accounts still provide attackers with access?
Understanding the scope of the incident helps your IT team prioritize recovery and avoid overlooking systems that may still be compromised.
Do not assume that your existing backups are safe.
Ransomware attackers may attempt to encrypt or delete accessible backup copies. Protect any remaining backup repositories by restricting access and disconnecting vulnerable storage where appropriate.
We also recommend preserving relevant logs, system images, and other evidence for forensic investigation.
Ransomware incidents can involve compromised credentials, hidden persistence mechanisms, and unauthorized access that began long before the encryption occurred.
If your organization does not have an internal incident response team, consider contacting a qualified cybersecurity provider.
The goal is to identify how attackers entered the environment, remove their access, and establish a clean recovery environment before restoring business operations.
Once the attack has been contained and the recovery environment is considered safe, you can evaluate the available recovery options.
Not every method works in every situation. The right choice depends on the ransomware variant, the extent of the damage, and whether clean copies of the affected data are available.
For most organizations, restoring from a verified backup is the most reliable recovery option.
If you have backups created before the ransomware attack, you may be able to restore affected files, databases, and entire systems without paying the attackers.
However, there are several things to check before starting:
Identify backup copies created before the suspected compromise.
Verify that the selected backups have not been encrypted or tampered with.
Scan the recovery environment and backup data for signs of malware.
Restore critical systems in a controlled, isolated environment.
Validate the recovered data before reconnecting systems to production.
One important detail: the latest backup is not necessarily the safest backup.
If attackers were present in your network for several days before deploying ransomware, some recent backup copies may already contain compromised or encrypted data.
For this reason, we recommend reviewing the incident timeline and selecting a recovery point that predates the actual compromise whenever possible.
Microsoft also provides guidance on ransomware incident response and recovery planning. See its ransomware incident response guidance for additional recommendations.
In some cases, it may be possible to decrypt files without restoring them from backups.
Security researchers and law enforcement organizations have developed free decryption tools for certain ransomware variants. These tools may take advantage of weaknesses in the encryption implementation or make use of recovered decryption keys.
One resource worth checking is the No More Ransom project, which provides a collection of ransomware identification resources and available decryption tools.
Before using a tool, make sure you have correctly identified the ransomware variant and verified that the tool comes from a trusted source.
Keep in mind that decryption tools are not available for every ransomware family. Strong encryption implemented correctly generally cannot be reversed without the appropriate key.
Before attempting to decrypt files, check whether a free decryption tool is available through the No More Ransom project.
Another option is to restore data to a point in time before the ransomware attack.
This is particularly useful when an organization has maintained historical recovery points through snapshot-based protection or Continuous Data Protection (CDP).
For example, imagine that ransomware encrypted a company’s production database at 3:00 PM on Tuesday.
If a clean recovery point is available from 2:30 PM, the organization may be able to roll back the affected data to that earlier state rather than trying to decrypt the encrypted files.
The basic process looks like this:
Identify when the data was first compromised.
Locate a recovery point created before that time.
Verify that the selected recovery point is clean.
Roll back the affected data or restore it to an isolated environment.
Validate data integrity before resuming business operations.
This approach can help reduce data loss, especially when the available recovery points are close to the time of the attack.
However, the availability of a suitable recovery point depends on the protection configuration, retention policy, and whether the attack affected the underlying recovery data.
Organizations may also have snapshots or replicated copies of their production data.
These resources can provide additional recovery options, but we should not assume that every snapshot or replica is clean.
For example, real-time replication may have copied ransomware-encrypted changes from the production environment to the secondary system.
Similarly, snapshots created after the initial compromise may contain damaged or encrypted data.
Before using these copies, check their creation times, integrity, and relationship to the attack timeline. Only restore from a version that has been verified as suitable for recovery.
Recovering data becomes much more difficult when no clean backup or suitable recovery point is available.
However, there are still a few options worth investigating.
Start by identifying the ransomware variant and checking whether a trusted decryption tool exists.
The No More Ransom project is a useful starting point. It provides resources for identifying ransomware and finding available decryptors.
If a compatible tool exists, follow its instructions carefully and test it on copies of affected files rather than modifying the original data.
If the affected data is particularly important, you may consider consulting a professional data recovery or incident response provider.
Depending on the storage technology and nature of the damage, specialists may be able to recover some data from damaged storage devices or identify other recovery opportunities.
However, this approach is not guaranteed to work. When files have been securely encrypted and the original data has been overwritten or otherwise destroyed, conventional recovery techniques may not restore the information.
Paying the ransom is generally not recommended.
Even if attackers promise to provide a decryption key, there is no guarantee that the key will work or that all affected data can be recovered.
Payment also does not remove malware, close security vulnerabilities, or prevent attackers from returning. In double-extortion attacks, stolen information may still be disclosed even after payment.
Before making any decision, consult your legal, cybersecurity, and incident response teams. Organizations should also consider applicable regulatory requirements and legal restrictions.
The most important point is that paying a ransom should never be treated as a guaranteed data recovery strategy.
Recovering files does not necessarily mean the incident is over.
Before reconnecting restored systems to the production network, we recommend checking several areas.
Verify Data Integrity
Check whether recovered files, databases, and application data are complete and consistent. For critical databases, perform appropriate integrity checks and application-level validation.
Confirm the Recovery Environment Is Clean
Ensure that malware, unauthorized accounts, and attacker persistence mechanisms have been removed. Rebuilding affected systems from trusted installation images may be necessary.
Reset Compromised Credentials
Review privileged accounts, service accounts, and other credentials that may have been exposed. Reset affected credentials and strengthen authentication controls.
Restore Critical Services in Stages
Do not bring every system back online at once.
Prioritize services according to their importance to business operations. For example, identity services, critical databases, and essential business applications may need to be restored before less important systems.
Monitor Systems After Recovery
Continue monitoring network traffic, user activity, system logs, and security alerts after services are restored.
If suspicious activity appears again, investigate it before assuming the recovery is complete.
For further guidance on data integrity and recovery planning, organizations can refer to NIST’s publication on recovering from ransomware and other destructive events.
While no security strategy can eliminate every risk, organizations can improve their ability to recover by preparing for data loss before an attack happens.
In our view, a good ransomware recovery strategy should not rely on a single backup or protection method.
Regular backups provide an essential recovery foundation.
We recommend following the 3-2-1 backup rule:
Keep at least three copies of important data.
Store copies on at least two different types of storage media.
Keep at least one copy offsite or offline.
Where possible, use immutable storage and restrict administrative access to backup repositories.
Just as importantly, test your backups regularly. A backup that cannot be restored when needed offers little practical protection.
Traditional scheduled backups capture data at specific intervals. Depending on the backup schedule, changes made between backup jobs may not be included in the latest recovery copy.
Continuous Data Protection (CDP) provides another layer of protection by continuously capturing data changes and maintaining recovery points over time.
If a ransomware attack corrupts production data, organizations may be able to roll back to a suitable recovery point created before the attack.
For enterprises that require more frequent recovery points and reduced data loss, CDP can complement traditional backup strategies.
For example, i2CDP provides real-time data replication and point-in-time rollback, helping organizations recover data from an appropriate recovery point before ransomware-related corruption occurred.
It is important to remember that CDP does not decrypt ransomware-encrypted files. Its recovery value comes from having a suitable, clean historical recovery point available.
Evaluate Your
Disaster Recovery Capabilities
Assess your recovery and business continuity capabilities to help prepare for system failures and service outages.
Having backups and recovery tools is only part of the equation.
We recommend conducting regular recovery exercises to confirm that your organization can actually restore its critical systems within the required timeframe.
During these exercises, check:
Whether recovery points are available and usable.
How long it takes to restore critical systems.
Whether recovered data is complete and consistent.
Whether recovery procedures work across different environments.
Whether IT staff understand their responsibilities during an incident.
These tests help identify weaknesses before a real ransomware attack puts business operations at risk.
Can Ransomware-Encrypted Data Be Recovered?
Yes, in some cases. Organizations may recover encrypted data from clean backups, use an available decryption tool, or roll back to a suitable recovery point created before the attack. However, recovery is not always possible, particularly when no usable backup or decryption key exists.
Should You Pay the Ransom to Recover Your Files?
We generally recommend against paying the ransom. Attackers may fail to provide a working decryption key, and payment does not guarantee that stolen data will remain private or that the attackers will not return.
Can Ransomware Encrypt Backup Files?
Yes. If backup storage is accessible from compromised systems or accounts, attackers may be able to encrypt or delete backup files. This is why offline, isolated, and immutable backup copies are important.
How Long Does Ransomware Data Recovery Take?
Recovery time depends on the number of affected systems, the amount of data, backup availability, infrastructure complexity, and the time needed to verify that the environment is safe. A small-scale incident may be resolved relatively quickly, while a widespread enterprise attack can require a much longer recovery process.
Can You Recover Data Without a Backup?
Sometimes. You can check for publicly available decryption tools or consult professional recovery specialists. However, if the data has been securely encrypted and no decryption key or clean copy exists, recovery may not be technically feasible.
Recovering data after a ransomware attack requires more than restoring files. Organizations must contain the incident, identify clean recovery points, verify data integrity, and ensure that restored systems are safe to use.
We recommend combining regular backups, isolated storage, and continuous data protection to build a more resilient recovery strategy. With the right preparation, businesses can reduce potential data loss and restore critical operations with greater confidence when a ransomware attack occurs.
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