Trojans and snort

[stephanie sokhn <sokhnstephanie () hotmail com>]

hello, I've downloaded a trojan on ubuntu 12.04  and accessed its shell from backtrack using metasploit. The thing is 
that all the alerts received from snort were about  BAD-TRAFFIC loopback traffic and nothing more.Is there something 
wrong with my configuration? shouldn't snort detect this kind of exploits?Is there any additional predefined rules for 
snort IPS that drop packets ?
would appreciate any kind of help.

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