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Batten down the hatches and plug open ports for security
Trojan horses, often included within Internet viruses or worms, can open additional TCP/UDP ports on your PC. The SANS Institute has created a list of Trojans and their known port use. For example, mysterious traffic on port 7597 could be a sign of the Qaz Trojan. Qaz, you might remember, opened the hole in the Microsoft Corporation that allowed a malicious user to surf their internal network in the fall of last year.
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