Sounds interesting and excessively comples; You can just as easily do this: - Send X bytes of the script - Send the line `curl my.server.com/asdjkfh` - Stop

Sounds interesting and excessively comples; You can just as easily do this: - Send X bytes of the script - Send the line `curl my.server.com/asdjkfh` - Stop sending data, wait for a request to `/asdjkfh` - If you receive said request, start sending malicious data - If you don't, wait 5 seconds and continue sending a "fake" script