Remove Ferosas and Decrypt .ferosas Files

By | Posted on May 24, 2019 | Updated on June 29, 2019

Ferosas ransomware is a highly hazardous computer virus that was observed to be from the clan of STOP/DJVU. This worldwide campaign to attack computer users is likely to be spreading in the same manner as older variants. Makers of Ferosas virus are utilizing spam email messages, hacked websites, and software bundling hoax to penetrate target computers.

Once executed on the computer, Ferosas will use complex algorithm to encrypt files and append the file with .Ferosas extension. As an example, picture.jpg file will become picture.jpg.Ferosas after completing the encryption process. Similar to most previous attacks, Ferosas ransom virus will display a fake Windows Update window showing completed percentage as shown in the screenshot image below.

Ferosas installed executable files especially under LocalAppData folder will be able to download additional files from a remote server. One of the executable file can disable Windows Defender program and other anti-virus applications to avoid monitoring and detection. Another file is able to modify Windows system HOSTS file to block internet access to certain security websites. Another file named Pdatewin.exe is the primary responsible for showing the fake Windows Update to trick users about the ongoing system update wherein fact, multiple file encryption are taking place, which is causing the system slow down.

Ferosas Ransonmware

Ferosas ransomware communicates with command-and-control server to provide unique victims ID based on infected computer’s MAC address. Therefore, an exclusive encryption key represents each victim and matching private key is needed in order to restore infected files. To obtain this, including the decryption software, makers of Ferosas ransom virus demands $980 and will be much cheaper if victim’s is able to process the payment earlier than given deadline. Complete instructions to recover Ferosas encrypted files are stored in a text file named _readme.txt that is located on folder of encrypted data. Here is an excerpt from the ransom note.

ALL YOUR FILES ARE ENCRYPTED
Don’t worry, you can return all your files!
All your files documents, photos, databases 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.
What guarantees do we give to you?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information
Don’t try to use third-party decrypt tools because it will destroy your files.
Discount 50% available if you contact us first 72 hours.

How to Remove Ferosas Ransomware

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Ferosas 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.

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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 Ferosas virus and other malicious entities. Follow the prompt to proceed with the removal.

ERAR

Stage 2: Double-check for Ferosas’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)

download-msrt

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 Ferosas. Another option is to browse the location folder and double click on the file to run.

msrt-icon

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.

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5. Next, you will see Scan Type. Please choose Full Scan to ensure that all Ferosas 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.

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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.

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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 Ferosas have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.

Stage 3 : Unlocking files with Ferosas Decryption Tool

So far, this Ferosas 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 (.ferosas)”, 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.

StopDecrypter Information

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 Ferosas 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 Ferosas

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 Ferosas.

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 Ferosas infection.

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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.

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