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Danger level 6
Type: Trojans
Common infection symptoms:
  • Slow Computer
  • System crashes
  • Normal system programs crash immediatelly
  • Connects to the internet without permission
  • Installs itself without permissions
  • Can't be uninstalled via Control Panel

SepSys Ransomware

SepSys Ransomware is nothing to joke about. It is a dangerous file-encryptor that vicious cybercriminals stand behind. They take a hold of your files by changing the data within, which ensures that you cannot read them. To put it simply, the threat, hijacks them, and even though it does not delete them per se, they are as good as gone. Of course, the attackers want you to think that you can pay money for a decryptor, but we seriously doubt that you would get it if you fulfilled the demands that are introduced by the attackers. We discuss them further in the report. Hopefully, you have backups and can replace the corrupted files, in which case, you should not even consider paying the ransom. On the other hand, even if you cannot replace the files with backups, paying the ransom is a terrible idea. Hopefully, you can recover files and remove SepSys Ransomware easily, and we are sure that the information presented in this report will help you take appropriate steps immediately.

You can tell if SepSys Ransomware has invaded your system and encrypted your files if you can see the “.sepsys” extension attached to their names. You are unlikely to notice when files get encrypted because this process is silent and quick. The threat is able to corrupt files as soon as it slithers in, and it is most likely to do that using spam emails, malicious downloaders, and also vulnerability exploits. Once inside, SepSys Ransomware does not waste time. Personal users’ files are encrypted immediately, and then a file named “README.html” is dropped. To ensure that this file opens every time the system is restarted, an autostart key is added to the Windows Registry. You can learn how to remove the key and the associated file using the manual removal guide below. Before you delete this file – and, by the way, it should be dropped to the %PROGRAMDATA%/%ALLUSERSPROFILE% directory – you might be interested in opening it and reading the message inside. That is safe to do, but you still need to be cautious.

The “README.html” file informs that all SepSys Ransomware victims need a decryption tool is they want to “save” their files. To obtain the tool, victims are instructed to donate $100 to a special Bitcoin wallet (3BL1TbL96gQFTR9EJFKX7JSp889oj2nJmj) and then confirm the donation by sending a message to After this, the victim is supposed to receive a “unique password” that should show how to use the decryptor. The instructions are clear, and you might be willing to pay $100 to get your files back. However, you should pay the ransom only if you do not mind wasting 100 dollars and if you understand the risks you could be facing if you decided to email cybercriminals. Note that they could use your email address to expose you to malware, blackmailing campaigns, and also other, unrelated scams. Hopefully, you have backups that can be used to replace the corrupted files. If you have this luxury, make sure you delete SepSys Ransomware first because the last thing you need is to have your backups corrupted also. If you do not have copies of personal files, make sure you create them in the future.

The instructions you can see below show how to delete SepSys Ransomware ransom note file and also how to modify the Windows Registry to ensure that the file cannot open on startup. Unfortunately, we cannot give you exact instructions on how to remove SepSys Ransomware launcher file because we simply do not know the name or the location of this file. If you are unable to find and remove it yourself, we strongly recommend implementing anti-malware software without further delay. Install it, and you will have all active threats eliminated automatically. Furthermore, you will have your operating system guarded, which will help you prevent new attacks. Also, note that there are thousands upon thousands of file-encrypting threats in the world, and any one of them could strike if you are not cautious. Make sure you create copies of personal files (store them outside the computer), secure your operating system, and be cautious online. If you open spam emails, download malware, or leave your system vulnerable, new threats could invade before the end of today.

SepSys Ransomware Removal

  1. Delete recently downloaded suspicious files.
  2. Simultaneously tap Win and E keys to access File Explorer.
  3. Enter %ALLUSERSPROFILE% into the field at the top.
  4. Delete the ransom note file named README.html.
  5. Simultaneously tap Win and R keys to access Run.
  6. Enter regedit into the dialog box to access Registry Editor.
  7. Go to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run.
  8. Delete the value named Service.
  9. Exit Registry Editor and then Empty Recycle Bin.
  10. Perform a full system scan using a malware scanner you trust.
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