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Andre

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Hi, I need some help with this problem.

We have been being blocked by some spam blacklists recently and checking Kerio Control logs we found out that one internal IP was generating some shady traffic, from different sequential ports to private IPs outside of our range.
Yesterday we checked the PC that had that IP and found one virus, I can't remember the virus name but the filename was irclassp.dll (of which we couldn't find any info).
The thing is that the traffic didn't stop today, although the computer is supposedly clean, according to two antivirus (Norton and Sophos).
I'm attaching a screenshot, if you have any idea of what could be.

Some things we noticed:

  • The origin port is never the same, but they are not random. Rather, it looks like it's incremental.
  • The destination port is always 161.
  • The destination IP address (192.168.1.x) is incremental, but it doesn't match our IP range (10.25.x.x). It looks like it's scanning the most common network mask?
  • Connection duration is 60-61 seconds.
  • These connections start in groups of eight, every 62 seconds.


P.S.: Although this internal traffic still exists, we haven't been blocked by spam lists yet today. Smile

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[Updated on: Fri, 10 October 2014 16:40]

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