To carry out the cryptoviral extortion attack, the malware generates a random symmetric essential and encrypts the victim's data with it. In a leakware attack, malware exfiltrates delicate host knowledge either to the attacker or alternatively, to remote circumstances of the malware, and the attacker threatens to publish the victim's knowledge unless a ransom is paid. In February 2013, a ransomware Trojan centered on the Stamp.