ViruXine.W32 virus hides their presence by changing the underlying executable code. This Virus code mutates while keeping the original algorithm intact, the code changes itself each time it runs, but

A polymorphic virus changes its binary signature each time it replicates, typically by re-encrypting its payload with a different key and mutating the decryption routine, while the underlying payload logic and behavior remain identical. This technique renders signature-based scanners ineffective because each copy presents a unique byte pattern. The question's description - 'code changes itself each time it runs, but the function of the code will not change' - is the textbook definition of polymorphic malware behavior.

A metamorphic virus completely rewrites its own code and can restructure its algorithmic logic on each iteration, going further than encryption-based mutation - the question specifies the original algorithm remains intact, which is inconsistent with metamorphic behavior.

Dravidic Virus is not a recognized malware classification or technical term in any established cybersecurity taxonomy.

A stealth virus evades detection by intercepting OS system calls to hide changes to file sizes or contents on disk, which is a fundamentally different evasion mechanism from code mutation.