Explanation:

BlackRock is a banking Trojan and said to be an enhanced version of existing Xerxes malware which itself is a variant of the LokiBot Android trojan. A trojan is any type of malicious program disguised as a legitimate one. Often, they are designed to steal sensitive information (login credentials, account numbers, financial information, credit card information, and the like) from users. Banking trojans are a specific kind of trojan malware. Once installed onto a client machine, banking trojans use a variety of techniques to create botnets, steal credentials, inject malicious code into browsers, or steal money. Hence option 3rd is correct.