Remove Gerosan Ransomware (.gerosan Decryption)

By | Posted on June 12, 2019 | Updated on June 26, 2019

Gerosan ransomware is another addition to the list of file-locking virus that belongs to STOP malware family. It can infect computers worldwide due to effectual tactics currently utilized by attackers wherein the threat can easily sway victims to run its malicious executable file.

One and probably the most thriving way for cyber crooks to deploy Gerosan is by attaching it to spam email message and mass-mailing the correspondence to huge list of random recipients. The malicious email is purportedly sent by a prominent organization containing critical attachment that requires immediate response. This tactic with sense of urgency greatly influences users to open the attached file, which is actually leads to execution of Gerosan harmful code. Users remain unaware on the imminent attack because the infection process is discrete and even installed antivirus application may not detect it.

After full execution and Gerosan completes the download and installation of supplementary files, it starts to look to target files and begin to encrypt them with highly complex algorithm. The process includes locking the data and removes its association to local programs by appending .gerosan file extension. To site an example, mypicture.jpg will turn out to be mypicture.jpg.gerosan if fully encrypted. Screenshot below shows the status of infected files that includes documents, photos, drawing, movie, and even backup file.

Gerosan Ransomware

Subsequently, Gerosan virus generates a ransom note on specific folders as infected files to serve as instructions in dealing with attackers and amount to be paid to acquire unique private key and .gerosan decryption software. Here is an extract from the ransom note (_readme.txt) file:

Don’t worry, 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.
What guarantees you have?
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.
You can get and look video overview decrypt tool:
hxxps://we.tl/t-hvv30uAtTY
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that’s price for you is $490.
Please note that you’ll never restore your data without payment.
Check your e-mail “Spam” or “Junk” folder if you don’t get answer more than 6 hours.

How to Remove Gerosan Ransomware

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Gerosan 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 alternative tool, Shadow Explorer or Previous Version as described below.

Stage 1: Scan the Computer with Anti-Malware Tool

1. Download free anti-malware scanner called MalwareBytes Anti-Malware.
Malwarebytes Anti-Malware Download Link (this will open a new window)

2. After downloading, install the program. It may run automatically or you have to double-click on the downloaded file MB3-Setup-[version].exe.

3. Carry out the installation with default setup process.

4. At the last stage of installation process, click the Finish button. The program should launch momentarily.

5. On Malwarebytes Anti-Malware console, select Scan from the menu to see available Scan Method.

6. Next, click on Threat Scan. This is the most complete scan method that will surely find any hidden malicious objects associated to Gerosan ransomware.

7. Finally, click on Start Scan begin checking the computer for malware and similar threats.

MBAM-threatscan

8. Once the scan has completed, the tool will display the list of detected threats. Remove all identified malicious items and restart the computer if necessary.

Stage 2: Double-check for Gerosan’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 Gerosan. 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.

msrt1

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

msrt2

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.

msrt3

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

Stage 3 : Unlocking files with Gerosan Decryption Tool

So far, this Gerosan 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 (.gerosan)”, 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 Gerosan 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 Gerosan

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 Gerosan.

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 Gerosan infection.

shadow3

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.

2 thoughts on “Remove Gerosan Ransomware (.gerosan Decryption)

  1. Arvind Rathore

    Guys use Stopdecrypt. It’d totally free and I recovered all my files.

  2. Ceylon

    I tried AVG/AVAST/KASPERSKY – Nothing detected the Gerosan ransom
    I tried Hitman pro – Did not working and have to pay even it says free but did not detect Ransoms
    I tried Malwarebites – It could clear my system file in (C ) but other devices D E , USB did not remove or detect
    I tried STOPCRPT – it worked well and I could find my all files and it needs to remove affected by manual but the softwere convert to a new same file format.

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