Viral Parmar discusses the history and types of malware, including viruses, trojans, ransomware, and scareware. Some notable ransomware strains described are CryptoLocker, Cryptowall, Locky, and WannaCry. The document also outlines how to create ransomware-as-a-service using the "Tox" kit and provides steps to remove ransomware infections along with decryption tools.