Polymorphic Virus


In computing, polymorphic code is a code that uses a polymorphic engine to mutate while keeping the original algorithm intact – that is, the code changes itself every time it runs, but the function of the code will not change at alL.


Polymorphic viruses are complex file infectors that can create modified versions of itself to avoid detection yet retain the same basic routines after every infection. To vary their physical file makeup during each infection, polymorphic viruses encrypt their codes and use different encryption keys every time.

Polymorphic viruses rely on mutation engines to alter their decryption routines every time they infect a machine. This way, traditional security solutions may not easily catch them because they do not use a static, unchanging code. The use of complex mutation engines that generate billions of decryption routines make them even more difficult to detect.

Polymorphic viruses are usually distributed via spam, infected sites, or through the use of other malware. URSNIF, VIRLOCK, VOBFUS, and BAGLE or UPolyX are some of the most notorious polymorphic viruses in existence. When combined with other malicious routines, polymorphic viruses pose even greater risk to its victims. In March 2015, researchers found that VIRLOCK evolved to include ransomware routines, making it a challenge to detect and remove.

What are the examples of polymorphic virus?

Polymorphic viruses are usually distributed via spam, infected sites, or through the use of other malware. URSNIF, VIRLOCK, VOBFUS, and BAGLE or UPolyX are some of the most notorious polymorphic viruses in existence.

What are the symptoms of polymorphic virus?

A polymorphic virus is a harmful, destructive or intrusive type of malware that can change or “morph,” making it difficult to detect with antimalware programs. Evolution of the malicious code can occur in a variety of ways such as filename changes, compression and encryption with variable keys.

What do polymorphic viruses attempt to achieve?

These viruses repeatedly change their overt characteristics in an attempt to evade and outwit your computer’s defenses and sabotage your system. Polymorphic capabilities are designed to evade signature-based cybersecurity solutions like antivirus and Anti-Malware

What is the difference between metamorphic and polymorphic viruses?

The difference between polymorphic and metamorphic virus is that polymorphic virus encrypts itself using a variable encryption key so that each copy of the virus appears different while metamorphic virus rewrites its code itself, to make each copy of the virus appear different without using a variable encryption key.

How to Prevent the Polymorphic Virus?

  1. Keep Your Software up to Date.
  2. Never Click Suspicious Links or Attachments.
  3. Update Your Defenses.
  4. Use Heuristic Scanning.
  5. Use Behavior-based Detection.
  6. Back up Your Data Regularly.

How to Get Rid of the Polymorphic Virus?

If you have created a system image before your computer is infected with the polymorphic virus, then you can try to run System restore to get rid of the polymorphic virus. But when using this method, you need to be 100% sure that this restore point is not infected with the polymorphic virus.

Follow the simple guide to perform the System Restore:

Step 1: Press the Win + R keys at the same time to open the Run box.

Step 2: Type rstrui in the box and press Enter to open System Restore.

Step 3: Click Next, choose a restore point from the list and then click Next again.

Step 4: Confirm your restore point and then click Finish. Click Yes. Then wait for the process to complete.

Step 5: Reboot your PC to see if the problem is resolved.

perform System Restore

If you haven’t created a system restore point, then you should reinstall your Windows system.

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