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Avast Ransomware Decryption Tools 1.0.0.840 Download – Complete File Recovery Guide
Ransomware can make important documents, photographs, videos, and other personal files inaccessible by encrypting them and demanding payment for their recovery. When a known ransomware family has a publicly available decryption method, a dedicated decryptor can sometimes restore affected files without paying the attacker.
Avast Ransomware Decryption Tools 1.0.0.840 are a collection of free utilities designed for specific ransomware families. Avast provides separate decryptors for different threats rather than one universal tool. Its current collection includes tools for ransomware such as AES_NI, Alcatraz Locker, Apocalypse, AtomSilo & LockFile, Babuk, BadBlock, Bart, BTCWare, GandCrab, Jigsaw, TeslaCrypt, Troldesh/Shade, XData, and several others.
The most important point is that a decryptor only works when it supports the particular ransomware variant and encryption method involved. Avast notes that many ransomware strains still do not have an available decryptor.
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What Are Avast Ransomware Decryption Tools?
Avast Ransomware Decryption Tools are specialized Windows utilities designed to recover files encrypted by particular ransomware families.
Each tool is developed for a specific ransomware type or group of related variants. Avast’s decryption page provides information that can help users identify an infection, including changed filename extensions, ransom-note names, and other indicators.
For example, Avast identifies AES_NI by extensions such as .aes_ni, .aes256, and .aes_ni_0day, while BadBlock does not necessarily rename encrypted files and instead displays a ransom message.
This identification step is important because using an unrelated decryptor will not normally recover files encrypted by another ransomware family.
How Avast Ransomware Decryption Tools Work
Ransomware decryptors take advantage of weaknesses, recovered keys, known encryption methods, or other technical information associated with particular ransomware families.
When a suitable decryptor exists, it can analyze encrypted files and attempt to restore them to their original form.
The exact process differs between ransomware families. Some decryptors support particular variants or encryption keys only. Avast’s CryptoMix information, for example, states that its tool supports files encrypted using an offline key and cannot restore files encrypted with a different key.
Therefore, successful recovery depends heavily on correctly identifying the ransomware and matching it with the appropriate tool.
Key Features of Avast Ransomware Decryption Tools
Free Ransomware Recovery Tools
Avast provides its ransomware decryptors as free tools. The official collection allows users to select a known ransomware family and access the corresponding fix.
This can provide an alternative to paying a ransom when a working decryptor is available.
Support for Different Ransomware Families
There is no single decryptor that works with every ransomware infection. Avast maintains separate tools for many known families.
The current Avast collection includes numerous ransomware names, including AES_NI, Babuk, Bart, CrySiS, GandCrab, HiddenTear, Jigsaw, Prometheus, TargetCompany, TeslaCrypt, and others.
Offline Decryption
Some ransomware families can be decrypted when specific offline keys or other recoverable information are available.
However, this does not apply universally. A decryptor may only work with particular variants or encryption keys.
File Recovery Without Paying a Ransom
When a compatible decryptor exists and successfully handles the affected files, victims may be able to recover their data without purchasing a decryption key from the attacker.
Avast recommends using available decryption options rather than assuming that paying the ransom will guarantee recovery.
Identification Information
Avast’s ransomware pages provide identifying information for individual threats. This can include file extensions, ransom-note names, desktop messages, and other infection characteristics.
Dedicated Decryption Programs
Rather than providing one large application for every ransomware family, Avast offers dedicated fixes for supported threats.
This makes it easier to select a tool specifically designed for the identified infection.
Supported Ransomware Families
Avast’s current decryption page lists a broad range of ransomware families. Examples include:
- AES_NI
- Alcatraz Locker
- Apocalypse
- AtomSilo & LockFile
- Babuk
- BadBlock
- Bart
- BigBobRoss
- BTCWare
- Crypt888
- CryptoMix
- CrySiS
- EncrypTile
- FindZip
- Fonix
- GandCrab
- Globe
- HermeticRansom
- HiddenTear
- Jigsaw
- LambdaLocker
- Legion
- NoobCrypt
- Prometheus
- Stampado
- SZFLocker
- TargetCompany
- TeslaCrypt
- Troldesh / Shade
- XData
The supported list can change as security researchers discover new information and new decryptors become available.
How to Identify the Ransomware on Your Computer
Correct identification is one of the most important steps before attempting file recovery.
Start by examining the affected files. Ransomware often changes the file extension or filename after encryption. For example, Avast documents .bart.zip for Bart and .obfuscated for BigBobRoss.
You should also look for ransom notes. These files may contain information about the ransomware family or instructions left by the attackers.
Other useful indicators include:
- Changed file extensions
- Ransom-note filenames
- Desktop wallpaper changes
- Messages displayed after infection
- Unusual files created in affected folders
- The date and circumstances when files became inaccessible
Do not rely on the filename extension alone when the identification is uncertain. Different ransomware families can sometimes use similar extensions.
How to Download Avast Ransomware Decryption Tools
The safest way to obtain an Avast decryptor is through Avast’s official ransomware decryption page.
Avast Free Ransomware Decryption Tools
From the official page, select the ransomware family that matches the signs found on your computer. Avast provides individual download options and information for supported threats.
Avoid downloading supposed decryptors from random file-sharing websites or unofficial sources. A ransomware victim is already dealing with a security incident, so introducing another unknown executable can create additional risks.
How to Choose the Correct Decryption Tool
Selecting the correct decryptor is more important than simply finding an Avast tool.
Compare the characteristics of the infected computer with Avast’s information for each ransomware family.
Check:
- The changed file extension.
- The ransom-note filename.
- The ransom message.
- Other files created by the ransomware.
- The documented ransomware variant.
- Any limitations listed for the decryptor.
For example, Avast’s TargetCompany documentation identifies extensions such as .mallox, .exploit, .architek, .brg, and .carone, along with a RECOVERY INFORMATION.txt ransom note.
How to Install an Avast Decryption Tool
Most Avast decryptors are designed as standalone utilities rather than requiring a complete security-suite installation.
After downloading the appropriate official tool, follow its included instructions carefully.
A typical process involves:
- Downloading the correct decryptor.
- Saving the utility to a trusted location.
- Opening the tool with appropriate Windows permissions if required.
- Reading the available options.
- Selecting the affected location or files.
- Starting the decryption process.
- Waiting for the tool to finish.
- Checking recovered files afterward.
Individual decryptors may have different interfaces and options, so the instructions provided with the specific tool should take priority.
How to Prepare Your Computer Before Decryption
Before attempting recovery, it is important to avoid making the situation worse.
If ransomware is currently active, first focus on stopping further encryption and securing the computer. Avast distinguishes its Ransomware Shield protection feature from its decryptors: Ransomware Shield helps protect files from ransomware activity, but it does not decrypt files that have already been encrypted.
It is also sensible to:
- Preserve copies of encrypted files.
- Avoid deleting ransom notes.
- Disconnect affected systems from networks when appropriate.
- Make a backup copy of encrypted data before experimenting with recovery.
- Confirm the ransomware family before running a decryptor.
- Keep recovered data separate until the system has been checked for malware.
How to Decrypt Ransomware-Encrypted Files
Once the ransomware has been identified and a compatible Avast decryptor is available, follow the instructions supplied with that particular tool.
The general process is to select the encrypted files or folders and allow the decryptor to examine them.
Some tools may provide options for processing entire directories or specific file locations.
Do not assume that every encrypted file will necessarily be recoverable. The result depends on the ransomware variant, encryption method, available keys, and limitations of the specific decryptor.
How to Handle Encrypted Files Safely
Encrypted files should be preserved until you are confident that recovery is complete.
Avoid permanently deleting encrypted originals immediately after a successful-looking decryption. Keep a backup copy until the restored files have been opened and verified.
This is particularly important when dealing with valuable documents, photographs, databases, or business records.
What to Do If Decryption Does Not Work
A failed decryption attempt does not necessarily mean that the files are permanently lost.
First, confirm that the ransomware family was identified correctly. Then check whether the particular variant is actually supported by the decryptor.
Avast explains that many ransomware strains still do not have a working decryptor. In such situations, restoring data from a clean backup may be the most practical recovery option.
Do not repeatedly experiment with unrelated decryptors, because different ransomware families use different encryption techniques.
Avast Ransomware Decryption Tools vs Ransom Payment
A ransom payment does not guarantee that encrypted files will be restored. Avast’s ransomware guidance specifically notes that even after paying, there is no guarantee that files can be recovered.
A free decryptor, when available, can provide another recovery route.
However, users should understand that decryptors are not universal. If no compatible tool exists, alternative recovery methods such as clean backups may be necessary.
Limitations of Ransomware Decryption Tools
Avast’s decryptors have important limitations.
A tool may only support:
- A particular ransomware family
- Specific variants
- Particular encryption keys
- Certain file extensions
- Specific encryption methods
- Certain versions of the ransomware
For example, Avast states that its CryptoMix decryptor only supports files encrypted using an offline key. Files encrypted using another key cannot be restored by that particular tool.
This is why ransomware identification should come before decryption.
Avast Ransomware Decryption Tools System Requirements
Many Avast ransomware decryptors are Windows applications, although individual tools can have different requirements.
Avast’s guidance notes that most of these tools are intended for Windows PCs.
Before using a specific decryptor, check its documentation for the applicable Windows version, architecture, and other requirements.
Are Avast Ransomware Decryption Tools Safe to Use?
Official Avast decryptors are intended to help victims recover files from supported ransomware infections.
For safety, download them directly from Avast’s official website rather than from unknown third-party download pages.
It is also important to distinguish a decryption tool from a ransomware prevention feature. Avast Ransomware Shield protects selected files and folders from unauthorized modification, deletion, or encryption, but it cannot decrypt files that ransomware has already encrypted.
Common Decryption Problems and Solutions
The Decryptor Says the Ransomware Is Not Supported
The infected system may be affected by a different ransomware family or variant. Recheck the file extension and ransom note and compare them with Avast’s documentation.
Some Files Are Recovered but Others Are Not
Different file types or encryption variants may behave differently. Review the decryptor’s specific limitations and preserve the remaining encrypted files.
The Tool Cannot Find Encrypted Files
Check that the correct folders or drives were selected and that the affected files still exist.
The Decryptor Reports That No Key Is Available
Some ransomware variants require specific keys that may not be publicly available. In such cases, a different recovery method may be necessary.
Recovered Files Cannot Be Opened
Verify that the decryption process completed successfully. Keep the original encrypted files and consult the documentation for the specific decryptor before attempting another recovery method.
How to Protect Your Computer From Future Ransomware Attacks
Decryption is only one part of ransomware recovery. Prevention is equally important.
Maintain regular backups of important data and keep at least one backup isolated from the computer when practical.
Other useful security practices include:
- Keep Windows and applications updated.
- Use reputable security software.
- Avoid suspicious email attachments.
- Do not open unknown executable files.
- Be careful with unexpected links.
- Use strong account credentials.
- Keep important backups separate from everyday storage.
- Enable ransomware protection where appropriate.
Avast’s Ransomware Shield can protect selected personal folders against unauthorized modification, deletion, or encryption by untrusted applications.
Pros and Cons of Avast Ransomware Decryption Tools
Pros
- Free decryption utilities
- Supports numerous known ransomware families
- Provides ransomware identification information
- Dedicated tools for specific threats
- Can recover files without purchasing a ransom key when compatible
- Official tools are available directly from Avast
- Useful information about ransomware variants is provided alongside the tools
Cons
- No universal decryptor exists
- Not every ransomware family is supported
- Some tools only work with particular variants or keys
- Successful recovery is not guaranteed
- Most tools are intended for Windows
- Correct ransomware identification is essential
Who Should Use Avast Ransomware Decryption Tools?
Avast’s decryption tools are primarily intended for users whose files have been encrypted by a ransomware family specifically supported by one of Avast’s decryptors.
They can be useful for:
- Home users affected by known ransomware
- Small businesses recovering encrypted files
- IT administrators investigating ransomware incidents
- Security professionals performing recovery work
- Users with older ransomware infections for which a decryptor has become available
For serious business or organizational incidents, professional incident-response or cybersecurity assistance may also be appropriate.
Conclusion
Avast Ransomware Decryption Tools provide free recovery utilities for a range of known ransomware families. The current Avast collection includes dedicated decryptors for threats such as AES_NI, Babuk, Bart, BTCWare, GandCrab, Jigsaw, TeslaCrypt, Troldesh/Shade, XData, and many others.
The most important step is identifying the ransomware correctly before selecting a decryptor. A tool designed for one ransomware family will not necessarily work against another, and some supported families can only be decrypted under specific conditions.
If your files have been encrypted, preserve the affected data, identify the ransomware, check Avast’s official decryption-tool list, and use only the decryptor intended for that particular threat. If no compatible decryptor exists, maintain the encrypted files and investigate clean backups or other legitimate recovery options rather than assuming that paying a ransom will guarantee recovery.