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тАО07-23-2007 03:07 AM
тАО07-23-2007 03:07 AM
System Communicating with an IRC Server
Our network security team contacted and informed me that one of our systems, Fedora Core 5, is communicating with an IRC server outside our network. The group has threatened to cut the system in question off the network. The system supposedly has an IRCbot running on the it.
I rebooted the server to reset the connection that it had, and I was planning on turning off all unnecessary services on the server. Besides the above, are there tools that I can use to prevent this from happening in the future? Thanks.
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тАО07-23-2007 08:47 AM
тАО07-23-2007 08:47 AM
Re: System Communicating with an IRC Server
It sounds like you've been root-kit'd.
So use 'rpm -Va' to verify that none of the binaries have been replaced, use 'netstat -ntlp', 'ps', and the contents of '/proc' to ensure you don't have any hidden processes.
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тАО07-23-2007 04:08 PM
тАО07-23-2007 04:08 PM
Re: System Communicating with an IRC Server
194/tcp/udp
529/tcp/udp
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тАО07-25-2007 02:01 PM
тАО07-25-2007 02:01 PM
Re: System Communicating with an IRC Server
example
nmap -v -p 194 xx.xx.xx.xx
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тАО07-30-2007 05:49 AM
тАО07-30-2007 05:49 AM
Re: System Communicating with an IRC Server
If this server has been root'ed you might not find anything using normal tools, and you might need to use [url=http://www.sleuthkit.org/]SleuthKit[/url] and [url=http://liveview.sourceforge.net/]LiveView[/url] to track down the culprits.
You should also check the firewall logs for any unusual traffic to/from this host, and after you've put the system back up on the network again you should setup tcpdump to log such activity.
Lars