full-disclosure - [UPDATE] ping floods

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <200308181325.h7IDPrCD029025@argosnet.com>
From: B3r3n at argosnet.com (B3r3n@...osnet.com)
Subject: [UPDATE] ping floods

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