Placing Backdoors through Firewalls
{"Image DocumentName": "Placing Backdoors through Firewalls", "Image ImageDescription": "The reverse www shell. This backdoor should work through any firewall and allow users to surf the WWW. A program is run on the internal host, which spawns a child every day at a special time. For the firewall, this child acts like a user, using his Netscape client to surf on the internet. In reality, this child executes a local shell and connects to the www server operated by the hacker on the internet via a legitimate looking http request and sends it ready signal. The legitimate looking answer of the www server operated by the hacker are in reality the commands the child will execute on it s machine in the local shell.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}