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Yesterday night around 2:00, I occasionally try out a snippet:

netstat -ntu | tail -n +3|awk '{ print $5}' | cut -d : -f 1 | sort | uniq -c| sort -n -r | head -n 5

Then it turns out one IP is having almost 120+ entries (I am not sure whether this word is appropriate)! The server where I ran the script above doesn't have much interesting stuff, just server with blogs which are almost never visited by people besides my friends. I think the phenomenon is really suspicious.

How can I find out what the user from the suspicious ip is doing? I don't any person who can have such a high interest in those blogs deep in the night. By the way, I checked the IP and found the ip is in my country, so it's not time-zone problem.

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What service were they connecting to? –  David Schwartz Mar 11 '12 at 13:35
    
Sadly I forgot about that! Just now I can check the command again and the output is quite normal now. –  allanruin Mar 11 '12 at 13:38
    
You should always keep logs like this, and make sure to also keep a timestamp of when the log was created that is as exact as possible (with the time zone). –  David Schwartz Mar 11 '12 at 13:45
    
You are totally right. I just keep track of output of the script mentioned, but forget to record the result of netstat -ntu ... –  allanruin Mar 11 '12 at 13:49
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Start with a whois ${IP_Address} and see what that returns, it's probably a webcrawler or script kiddie. Either way, really nothing to be done. –  Chris S Mar 11 '12 at 15:08

1 Answer 1

You should check the access logs of your web server to find out more.

If you are using Apache you can find them in the /var/log/apache2 or /var/log/httpd/ directory.

You probably shouldn't be too worried. It's probably just a search engine crawling your websites and blogs. They tend to be very thorough.

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I search the blog log and all other website logs and grep show nothing... –  allanruin Mar 12 '12 at 9:10

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