Rezuc ransomware is a file-locking virus where attackers threaten victims that files will be rendered useless if they do not pay the ransom money. Coming from Stop/Djvu clan, this malware typically spreads on the internet via spam email messages pretending to be from reliable contacts and prominent organizations. Rezuc utilizes worm that is capable of attacking the email system on infected computer and send a copy of the malware on located contact address. Users may also acquire the virus from hacked websites, malicious advertising campaigns, and bogus software updates.
If executed, Rezuc virus will integrate random malicious files on the infected computer, each with unique objective. Initially, this virus deactivates local security application like anti-virus and anti-malware program to avoid detection. It can also block access to specific security websites and anti-virus vendors by modifying Windows Hosts File to prevent victims from downloading removal tools and Rezuc decryption software, if there are available.
The main infection stage on Rezuc virus attack is decrypting target files on the computer using complex algorithm and assigning a unique encryption keys for each victims. It also appends the infected files with .rezuc extension that eliminates its association with valid programs. Having .rezuc at the end of the file extension, no other application will be able to open it, thus, it becomes useless and renders useless and inoperable.
To restore the infected files and remove the encryption, attackers are leaving a ransom note on each folder of infected files. The notes contain instructions, contact address, and payment amount in order for victims to obtain unique keys and decryption software. Here is an excerpt from a ransom note, which is very similar to previous variants:
Don’t worry my friend, you can return all your files!
All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
How to Remove Rezuc Ransomware
Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Rezuc virus. Aside from our suggested tool, you may also run your own security program.
Though affected files may be impossible to decrypt due to complexity of the encryption, you can still try recovery method like Shadow Explorer or Previous Version as described below.
Stage 1: Scan the Computer with ESET Rogue Application Remover (ERAR)
1. Download the free scanner called ESET Rogue Application Remover.
Download Link for ERAR (this will open a new window)
2. Choose appropriate version for your Windows System. Save the file to a convenient location, preferably on Desktop.
3. After downloading the file, Windows will prompt that download has completed. Click Run to start the program. Another option is to browse the location folder and double click on the file ERARemover_.exe.
4. On ESET Rogue Application Remover SOFTWARE LICENSE TERMS, click Accept to continue.
5. The tool will start scanning the computer. It will prompt when it finds Rezuc virus and other malicious entities. Follow the prompt to proceed with the removal.
Stage 2: Double-check for Rezuc’s leftover with Microsoft’s Malicious Software Removal Tool
1. Download the free scanner called Malicious Software Removal Tool.
Malicious Software Removal Tool Download Link (this will open a new window)
2. The tool automatically checks the operating system and suggest appropriate download version. Click on Download button to begin. Save the file to a convenient location, preferably on Desktop.
3. After downloading the file, Windows will prompt that download has completed. Click Run to start scanning for Rezuc. Another option is to browse the location folder and double click on the file to run.
4. The tool will display Welcome screen, click Next. Please note the message “This tool is not a replacement for an antivirus product.” You must understand that this program is made specifically to find and remove malware, viruses, Trojans, and other harmful elements on the computer. It was not designed to protect the computer.
5. Next, you will see Scan Type. Please choose Full Scan to ensure that all Rezuc virus entities and other harmful files left on the computer will be found and removed. For advanced computer user, you can opt for Customized Scan, if there are other drives or folders you wanted to include in this scan.
6. Full scan may take a while, please wait for Malicious Software Removal Tool to complete the tasks. However, you may cancel the scan anytime by clicking on the Cancel button.
7. After scanning, the tool will reveal all identified threats. There may be other threats that our first scan fails to detect. Please remove/delete all detected items.
8. When removal procedure is complete, you may now close Malicious Software Removal Tool. We hope that Rezuc have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.
Stage 3 : Unlocking files with Rezuc Decryption Tool
So far, this Rezuc decryption tool works only for files that were encrypted using offline keys. This happens sometimes if the virus is unable to communicate to remote server to obtain unique keys; instead, it will use offline keys when encrypting files. However, there is a little chance of recovering files using this tool due to limited available offline keys that were integrated with this decryption tool.
For additional information (download link, supported versions, instructions) about StopDecrypter, please proceed to ransomware decryption tool archive page.
If you received a message stating that “No keys were found for the following IDs (.rezuc)”, please copy and submit the information to the official download page to include your information (log file) and have it archive in case decryption software becomes available.
We will update this section once the full decryption tool is on hand. In the meantime, please try other options below.
Option 1: Windows Previous Version Tool
Windows Vista and Windows 7 have a feature called Previous Versions. However, this tool is only usable if restore point was made prior to Rezuc virus infection. To use this tool and recover files affected by the virus, please follow these steps:
1. Open My Computer or Windows Explorer.
2. Right-click on the affected files or folders. From the drop-down list, please click on Restore previous versions.
3. New window will open display all backup copy of files and folders you wanted to recover. Choose the appropriate file and click on Open, Copy, or Restore. Restoring selected files overwrites the current encrypted files on the computer.
Option 2: Use ShadowExplorer to restore files encrypted by Rezuc
Just like Previous Version tool, ShadowExplorer is taking advantage of shadow copy created by Windows. This tool allows you to retrieve older version of files before it was encrypted by Rezuc.
1. Download ShadowExplorer from the official web site.
2. Install the program with the default settings.
3. The program should run automatically after installation. If not, double-click on ShadowExplorer icon.
4. You can see the drop-down list on top of the console. Please select proper drive and the most recent point-in-time shadow copies of files you wish to restore prior to Rezuc infection.
5. Right-click on the Drive, Folder, or File you wish to restore and click Export…
6. Lastly, ShadowExplorer will prompt for location where you want to save the copy of recovered files.