You don't need an account on the target system. Target PC opens a port and starts listening (outputting to file) Sending machine establishes a connection to t

You don't need an account on the target system. Target PC opens a port and starts listening (outputting to file) Sending machine establishes a connection to the listening port, and starts copying the file. Example (hide a file transfer as DNS traffic) Listening computer: nc -l -u -p 53 > output.file Sending computer: cat original.file > nc -u [destination ip address] 53 In this case you'd be dumb not to encrypt the file before transit. And as I mentioned already make sure you have a hash of the original. You can also use TCP. These are sneaky/simple ways to move files around. Downside: You need to poke a hole in a firewall, but options exist for that too. ssh/scp downside: You need an account on target PC to connect to. nc downside: you need an open port on the listening PC.