You are running known exploits against your network to test for possible vulnerabilities. To test the strength of
your virus software, you load a test network to mimic your production network. Your software successfully
blocks some simple macro and encrypted viruses. You decide to really test the software by using virus code
where the code rewrites itself entirely and the signatures change from child to child, but the functionality stays
the same. What type of virus is this that you are testing?
A.
Polymorphic
B.
Metamorphic
C.
Oligomorhic
D.
Transmorphic
Metamorphic and polymorphic malware are 2 categories of malware that have the ability to change their code as they propagate.
Metamorphic malware: rewritten with each iteration so that each succeeding version of the code is different from the preceding one. The code changes makes it difficult for signature-based antivirus software programs to recognize that different iterations are the same malicious program.
Polymorphic malware: make changes to code to avoid detection. It has two parts, but one part remains the same with each iteration, which makes the malware a little easier to identify.
Source: https://searchsecurity.techtarget.com/definition/metamorphic-and-polymorphic-malware