thus,

Which type of advanced malware has entire sections of code that serve no purpose other than to change the signature of the malware, thus producing an infinite number of signature hashes for even the smallest of malware programs?

Ransomware is software that uses encryption to disable a target’s access to its data until a ransom is paid. The victim organization is rendered partially or totally unable to operate until it pays, but there is no guarantee that payment will result in the necessary decryption key or that the decryption key provided will function properly.