Zyka ransomware removal instructions
What is Zyka?
Zyka is a ransomware-type virus that stealthily infiltrates systems and encrypts files using the AES encryption algorithm. During encryption, Zyka appends filenames with the ".lock" extension. For example, "sample.jpg" is renamed to "sample.jpg.lock". A pop-up window containing a ransom-demand message is then displayed.
The message states that files are encrypted using AES cryptography and that a ransom must be paid to restore them. AES is a symmetric encryption algorithm and, therefore, a unique key is generated to encrypt and decrypt files. It is impossible to decrypt files without this key, which cyber criminals store on a remote server. To receive it, a ransom equivalent of 170 USD/EUR in Bitcoins must be paid within 72 hours. After this period, the key is permanently deleted and, thus, files becomes undecryptable. Be aware, however, that cyber criminals should not be trusted - they often ignore victims, despite submitted payments. If you pay, there is a high probability that you will be scammed. We strongly advise that you ignore all requests to pay or contact these people. Unfortunately, there are no tools capable of cracking the AES algorithm and restoring files encrypted by Zyka. Therefore, you can only resolve this problem by restoring your files/system from a backup.
Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:
There are dozens of ransomware-type viruses that share similarities with Zyka. Examples include XCrypt, RansomPlus, Dharma, and many others. As with Zyka, the above malware also encrypts files and demands ransom payments. The only major differences between these viruses are cost of decryption and type of cryptography (symmetric/asymmetric) used. Distribution methods are also identical. Developers proliferate ransomware via third party software download sources (torrents, freeware download/free file hosting websites, etc.), spam emails (malicious attachments), trojans, and fake software updaters. Therefore, never download software from unofficial sources or open files received from suspicious/unrecognizable emails. Furthermore, use a legitimate anti-virus/anti-spyware suite and keep your installed applications up-to-date. Bear in mind, however, that cyber criminals are capable of exploiting software bugs/flaws to infect the system. Therefore, never use third party updaters. Poor knowledge and careless behavior is often the reason for computer infections.
Text presented within Zyka pop-up:
You are the victim of Zyka
Your important files encryption produced on this computer: photos, videos, documents etc. Here is a complete list of encrypted files, and you can personally verify this.
Encryption was produced using a unique public key AES that generated for this computer. To decrypt your files you need to obtain the private key.
The single copy of the private key, which will allow you to decrypt the files, located on a secret server on the Internet, the server will destroy the key after 72 hours.
After that nobody and never will be able to restore files.
To obtain the private key for this computer which will automatically decrypt files, you need to pay 170 USD /170 EUR to the bitcoin wallet below.
If you do not have bitcoins you can buy them from localbitcoins.com
Screenshot of files encrypted by Zyka ransomware (".lock" extension):
Zyka ransomware removal:
Instant automatic removal of Zyka virus:
Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of Zyka virus. Download it by clicking the button below:
- What is Zyka?
- STEP 1. Zyka virus removal using safe mode with networking.
- STEP 2. Zyka ransomware removal using System Restore.
Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.
Video showing how to start Windows 7 in "Safe Mode with Networking":
Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.
Video showing how to start Windows 8 in "Safe Mode with Networking":
Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.
Video showing how to start Windows 10 in "Safe Mode with Networking":
Log in to the account infected with the Zyka virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.
If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.
Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":
1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.
2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.
3. Next, type this line: rstrui.exe and press ENTER.
4. In the opened window, click "Next".
5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the Zyka ransomware virus infiltrating your PC).
6. In the opened window, click "Yes".
7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Zyka ransomware files.
To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of Zyka are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.
To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.
If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.
To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as Zyka ransomware.
HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:
Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:
- The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.
Other tools known to remove Zyka ransomware: