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In our research, we also observed that phishers are frequently combining the three attacking techniques we have observed and documented in this white paper, sometimes combining multiple methods to provide redundancy and protect their phishing infrastructure through implementation of a two-stage networking configuration. The following diagram depicts a possible phishing network topology:
In this example a central web server hosts the physical phishing content, often serving more then one web site (e.g. an eBay phishing-site in /ebay and a PayPal phishing-site in /paypal). Several compromised remote computers redirect incoming HTTP traffic on TCP port 80 to the central web server with the help of the redir port redirector. This has several advantages from an attacker's point of view when compared to a single phishing web site:
The use of such techniques again suggests more organised and capable attackers, rather than the work of simple script kiddies. Similar operational models are often used by major web hosting companies and high volume content providers.