Attacker can now use their teamserver:33912 as a web proxy. All the traffic that goes through this proxy will be forwarded/traverse the proxy opened on the victim system via the Internet Explorer process (port 6605). Since Internet Explorer relies on WinINet library for managing web requests and authentication, attacker's web requests will be reauthenticated allowing the attacker to view same applications the victim has active sessions to without being asked to login.