1 of 4
Danger level 7
Type: Trojans
Common infection symptoms:
  • Slow Computer
  • System crashes
  • Connects to the internet without permission
  • Installs itself without permissions
  • Can't be uninstalled via Control Panel

Sigma Ransomware

If Sigma Ransomware can sneak onto your computer, you can be sure that it will encrypt all your personal files. This means that you will not be able to open, view, or run these files anymore. Of course, the authors of this malicious threat offer you a way out if you pay a huge amount of money to receive the decryption software as well as the unique private key. However, there is little chance that this will happen at all. It is more likely that you will receive further infections than the key or a decryptor. The best way to recover your files is to have a recent backup in cloud storage, for instance. But you cannot transfer your clean files before you remove Sigma Ransomware from your PC. If you would like to be able protect your computer from similar attacks, we suggest that you read on to hear more about this dangerous infection.

Our research suggests that unlike most of its peers that are mainly spread in spamming campaigns or via Exploit Kits, this ransomware infection may pose as an application, i.e., a useful tool for computer users. You may thus download it after clicking on a third-party pop-up advertisement claiming that you urgently need this software to protect your computer or any other reasons. But you may also download it from shady torrent or shareware pages. It is possible that you are searching for a free program and you end up on one of the fake file-sharing pages. However, instead of your targeted software, you download a whole bundle of threats, including this ransomware program. Of course, it is also possible that your PC is already infected with malware like adware and this is why you are exposed to such a corrupt third-party pop-up ad. It is essential that you avoid questionable P2P websites no matter how tempting it may seem to download files and cracks for free. Most of these pages are used by cyber criminals to spread their malicious programs and infect potential victims. If this may have happened to you too, we recommend that after you delete Sigma Ransomware from your system, you scan your PC with a reliable malware scanner to find all other possible threat sources as well.

Although this ransomware may not be spread in other alternative ways, we find it important for you to know that you need to update your browsers and drivers frequently because you could even accidentally land on malicious pages that may use Exploit Kits to infect your with such ransomware threats. It is also advisable that you be cautious around your e-mails and not open questionable mails, let alone their attachments. Remember that you cannot delete Sigma Ransomware without the horrific consequence of losing them to encryption.

This ransomware program does not copy itself nor does it create a Point of Execution. Once you execute this malicious file, it attacks your personal files (images, documents, archives, databases, etc.) and encrypts them with AES and RSA algorithms producing a private key in the end without which it is impossible to decrypt your files. The infected files will have a new extension appended to the original one that has four random characters like ".wDn9" so your files should look like "image.jpg.wDn9" or something similar. This threat creates a ransom note .html file on your desktop called "ReadMe.html" and creates a "ReadMe.txt" in every single folder where files have been encrypted.

After the encryption is over, your desktop background changes and shows a basic ransom note. Then, the .html file is opened automatically in your default browser. This note informs you that you need to download the Tor browser and visit "yowl2ugopitfzzwb.onion" for further information about the payment. You are asked to pay 1,000 USD in Bitcoins to the provided Bitcoin address. If you do not transfer the money within a week, this amount doubles. These crooks offer you live support as well via XAMP. You need to create an account and add "Sigmaxxx@jabb.im" as your buddy so that you can chat with your attackers. We do not recommend that you contact these criminals in any way because your situation may as well get worse; you could be infected with further dangerous threats, for example. We advise you to remove Sigma Ransomware immediately.

We have found that this malware infection may remove itself from your system after the encryption. Of course, it would still leave a mess behind and you should take care of it if you would like to use a secure computer. Please follow our instructions below if you want to take matters into your own hands. Do not forget that if you have a backup of your files, you should not copy them back until this threat is eliminated. We suggest that you install a reliable anti-malware program, such as SpyHunter, to automatically safeguard your system from future malicious attacks.

How to remove Sigma Ransomware from Windows

  1. Tap Win+E.
  2. If this ransomware has not deleted itself, find the malicious .exe file and delete it.
  3. Delete all the ransom notes from your system.
  4. Empty your Recycle Bin and reboot your PC.
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