SAD RANSOMWARE – Remove and Restore Encrypted Files

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This article aims to help you by showing you how to remove SAD RANSOMWARE infection from your computer system and how to restore encrypted files.

New ransomware infection, going by the name SAD RANSOMWARE was recently detected by researchers. The virus aims to encrypt the files on the computers that have been infected by it and then add the unique victim ID as their file extension. After that, SAD RANSOMWARE also drops a _HELPME_DECRYPT_.txt file which has further instructions on how to make a ransom payoff in order to get the files decrypted again. If you have become a victim of SAD RANSOMWARE, you should immediately read this article and learn how to remove this malware and how to restore encrypted files.

Threat Summary

Type Ransomware, Cryptovirus
Short Description Encrypts the files on your computer system and then add a random number as a file extension to them.
Symptoms Files are encrypted with a unique identification number added to them. The ransom note _HELPME_DECRYPT_.txt is dropped.
Distribution Method Spam Emails, Email Attachments, Executable files
Detection Tool See If Your System Has Been Affected by SAD RANSOMWARE


Malware Removal Tool

User Experience Join Our Forum to Discuss SAD RANSOMWARE.
Data Recovery Tool Windows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

SAD RANSOMWARE – Infection methods

Similar to other ransomware viruses, SAD RANSOMWARE uses an infection file that is carefully obfuscated in order to evade antivirus detection. It may also have an exploit for components of Windows that can ensure it to become active on the infected computer by compromising the OS’s known bugs, if they are unpatched.

The file may be sent to you via e-mails, pretending to be a legitimate document, such as an invoice, receipt, banking statement or other form of seemingly legitimate document.

The e-mails which are sent can often pretend to be legitimate, coming from reputable sources, whose primary purpose is to trick you into opening the attachment, for example:

SAD RANSOMWARE – Infection Activity

After the infection has commenced, the SAD RANSOMWARE’s infecton file my connect to a third-party server from which the virus may sent information from your computer, such as:

  • System information.
  • Network information.

In addition to this, the virus may drop it’s payload in one or more of the following Windows directories:

  • %AppData%
  • %Local%
  • %Temp%
  • %Roaming%
  • %LocalRow%
  • %Documents%

Afrer doing so, the SAD RANSOMWARE virus may focus on attacking the Windows Registry editor, primarily by adding custom registry values with data embedded in them, which allows for it to automatically run on Windows startup. The targeted sub-keys for this to happen are the following:

→ HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

In addition to the Run and RunOnce sub-keys, SAD RANSOMWARE may create registry entries in the following sub-keys as well:

→ HKEY_CURRENT_USER\Control Panel\Desktop\
HKEY_USERS\.DEFAULT\Control Panel\Desktop\

After having set up, the virus may also delete the shadow volume copies of the infected computer, by running the following commands as an administrator:

→ process call create “cmd.exe /c
vssadmin.exe delete shadows /all /quiet
bcdedit.exe /set {default} recoveryenabled no
bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures

SAD RANSOMWARE also makes sure it’s presence becomes noticeable by changing your wallpaper with the following:

Text from image:

!!! IMPORTANT INFORMATION !!! SAD RANSOMWARE YOUR FILES HAVE BEEN ENCRYPTED More information about Bitcoins: More details can be found in _HELPME_DECRYPT_.txt file which you can find on your desktop. Your Personal ID:

SAD RANSOMWARE – Encryption Process

For the encryption, this virus uses a cipher which includes the generating of an assymetric key after the files are modified. The SAD RANSOMWARE virus does not encrypt the whole files, instead the virus encodes only portion of those files, just about enough to make them no longer able to be opened.

For the encryption process, documents, audio files, images, archives and other important files are being scanned for by SAD RANSOMWARE. Below you can see the possible file extensions that may be affected:


After the encryption is complete, the ransomware also sets a unique identification number which it has previously generated as a file extension on the victim’s computer. The encrypted files may appear like the following:

Remove SAD RANSOMWARE and Restore Encrypted Files

In order to remove this ransomware infection from your computer, recommendations are to immediately focus on deleting it’s payload and after this reverting the settings modified by it. You can do this manually or automatically by following the removal instructions below. The most effective removal method for ransomware viruses, like SAD is to download and install an advanced anti-malware software which will automatically remove this malware from your computer.

Furthermore, if you want to recover files that have been encrypted by SAD RANSOMWARE, we recommend you to use the alternative methods we have suggested for file recovery in step “2. Restore Files encrypted by SAD RANSOMWARE” below.

Manually delete SAD RANSOMWARE from your computer

Note! Substantial notification about the SAD RANSOMWARE threat: Manual removal of SAD RANSOMWARE requires interference with system files and registries. Thus, it can cause damage to your PC. Even if your computer skills are not at a professional level, don’t worry. You can do the removal yourself just in 5 minutes, using a malware removal tool.

1. Boot Your PC In Safe Mode to isolate and remove SAD RANSOMWARE files and objects

2.Find malicious files created by SAD RANSOMWARE on your PC

Automatically remove SAD RANSOMWARE by downloading an advanced anti-malware program

1. Remove SAD RANSOMWARE with SpyHunter Anti-Malware Tool and back up your data

2. Restore files encrypted by SAD RANSOMWARE

Optional: Using Alternative Anti-Malware Tools

Vencislav Krustev

A network administrator and malware researcher at SensorsTechForum with passion for discovery of new shifts and innovations in cyber security. Strong believer in basic education of every user towards online safety.

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