Client on the inside of the opening of 100 connections.

We were recently struck by the Nachi worm, quite difficult. Initially, one of the ways I've been able to tell who was infected was on the PIX 515 xlate table and see who had an extreme number of open connections. However, today, we met several PC that were cleaned that open always 100 or more connections to the Internet, causing our T1 coming to an abrupt stop.

Does anyone know another reason, that this can happen. I use myself ragged trying to deny these computers on the PIX, but there is no obvious cause. Many of the computers that were suspect have been scrutinised and found to be clean. Any advice?

Robert,

Perfect. The important part to see here is the portion of flags - saA. This means that the PIX built the connection because we saw a package inside the host's SYN and waiting outside the SYN ACk of the host. I still think that these hosts are infected by a kind of worm. My guess based on what we have seen in recent days is the Nachi/Welchia worm. Among this worm calling cards is it tries to connect to the computer targets on port 80 to exploit the WebDav vulnerability. But in this case, the target does not respond. These & expected the time-out period based on your conn timeout settings. Sorry I can't be more helpful. Good luck.

Scott

Tags: Cisco Security

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