ViruXine.

The virus described changes its own code with each execution but still performs the same actions. This is the hallmark of a Metamorphic Virus. Unlike polymorphic viruses (which use encrypted code with a changing decryptor), metamorphic viruses rewrite their own code entirely — including their decryption and execution routines — to avoid pattern detection by antivirus software.

Key characteristics of metamorphic viruses seen in the scenario:

Mutates completely on every execution.

Keeps overall functionality identical (semantics intact).

Alters its appearance and logic flow.

From CEH v13 Courseware:

Module 6: Malware Threats → Types of Viruses and Obfuscation Techniques

CEH v13 Study Guide states:

“Metamorphic viruses modify their own code structure and appearance with each iteration, without altering their underlying behavior. This makes them more difficult to detect through signature-based mechanisms.”

Incorrect Options:

A: Polymorphic viruses encrypt themselves with a changing decryptor stub but do not change their core logic.

C: “Dravidic Virus” is not a recognized term in cybersecurity.

D: Stealth viruses hide their presence (e.g., by intercepting system calls), but do not change their code structure.