Threat Level: green Handler on Duty: Brad Duncan

SANS ISC: SSH - new brute force tool? - Internet Security | DShield SANS ISC InfoSec Forums


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SSH - new brute force tool?

We have received some reports about a new SSH brute force script, possibly named dd_ssh, that gets dropped onto web servers, most likely via an older phpmyadmin vulnerability.  If you have sample log entries from a successful attack or can share a copy of dd_ssh, please let us know.  The current DShield figures do show a recent uptick in the number of sources that participate in SSH scanning.

Daniel

367 Posts
ISC Handler
might be worth mentioning SSHGuard hxxp://www.sshguard.net/ - certainly puts a kink in brute force attempts
Chavez243

15 Posts
Yeah, we've seen a sharp uptick in SSH scans for about a week now. This appears to be on the heels of massive setup.php scans that have been going on for the last two weeks. It is likely that this massive setup.php scan (one scanner testing a multitude of applications/URLs) yielded good results, which caused the increase or new formatinon of the server-based botnet. The vast majority of SSH scans were/are coming from web servers.
Frank

24 Posts
i've been under another one of those DDOS brutes for about a week as well... the majority are american or european mail servers. the ones that aren't range from home users to hosting providers, all over the world.
Anonymous
I saw an up tick in the frequency of scans for myphpadmin installations starting on Jul 18th, mostly from China and Colombia networks. The scan typically starts with requesting nosuichfile.php, then for /noxdir/nosuichfile.php, and continuing on looking for setup.php
Travis

5 Posts
Don't forget that if a account is only for one purpose (auditing, backups, for instance) you can lock the exact command that's run down in the authorized_keys/2 files.
DomMcIntyreDeVitto

39 Posts
I have seen a double fold increase of the number of ssh login attempts in the last two months. Denyhosts works well for me.
DomMcIntyreDeVitto
1 Posts

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