Placing Backdoors Through Firewalls version 1.5 - Hackers often want to retain access to systems they have penetrated even in the face of obstacles such as new firewalls and patched vulnerabilities. To accomplish this the attackers must install a backdoor which does its job is not easily detectable. The kind of backdoor needed depends on the firewall architecture used. As a gimmick and proof-of-concept, a nice backdoor for any kind of intrusion is included.
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