- Maildrop: Rent a mailbox, and them ask victims to send packages or information to the mailbox.
- Reverse social engineering: Create a condition to coax victims to call the attacker for help. In this case, the victim has already trusted the attackers. It is very easy for the attackers to ask for information or ask the victims to do something.
- Dead drop: A place where you drop an item in order (for you or for others) to retrieve it later; It could be a rented locker, a hidden hole in a wall, or an FTP server in another country.