1. The first computer virus was written by Basit and Amjad in 1986, replacing the boot sector of floppy disks with a copy of itself. 2. Ransomware infections can be identified by signs on an infected computer, and the WannaCry ransomware infected Deutsche Bahn through the SMBv1 vulnerability, also spreading through their network. 3. The dark web contains websites where ransomware can be customized and purchased, with the malware authors taking a cut of the ransom payments from infected computers.