Iiss ransomware is a type of cryptovirus that is classified as a money-extortion-based threat controlled by malicious actors. These threats are known for accessing user machines without permission and encrypting all files on them. This way, cybercriminals behind the malware can ask for a ransom payment in return for a unique key. This is one of the newest versions in Djvu ransomware family that stems from STOP ransomware, known for a long time already. However, this version is not the last probably, because criminals release a new variant once a week, at least.