Basic Ransomware in Nim

For learning purpose only

ransom e [path] [ip] [port]
ransom d [path] [key]

• the key will be sent in plain text to the server

For each file, the ransom will generate a new key using the master key generated.

KDF(masterKey, filename, filesize) = AES(masterkey, SHA(filename & $(filesize))

• use thread depending on the size of the file
• encrypting only the first 10mb of each files
• send the key to the server via DNS
• encrypt the key before sending to the server
• add the filename + size in the file just in case