[UPDATE] ping floods

[B3r3n () argosnet com]

All,

What we have here at the moment is the following:

1) IntraNet machines are pinging to random IP addresses (both targetting our IntraNet and outside)

2) From time to time, when a particular machine is pinging from a subnet, it appears some new machines on that subnet 
are starting to ping too.

3) these pings, grouped together, creates flooding (even if singlely they seems to be ping with a 1/3s TTL delay) 
impacting the whole IntraNet.

4) Checking a machine part of this ping "flood", we found nothing suspicious (no unknown program, ...) but we dont 
master Windows technology. The box was antivirused with a well-known vendor solution, up-to-date in its virus 
definitions.

Our assumptions is this might be a brand new worm, not yet known to antivirus companies (no news/alerts on their sites).

To solve, we applied on our routers routing the ICMP requests an access-list to bar these requests. This globally 
solved the problem until we can be able to solve each machine.

Thanks

Brgrds

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