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Bank Attackers Used PHP Websites As Launch Pads
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SpamIsLame
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SpamIsLame,
User Rank: Apprentice
4/29/2013 | 9:35:17 PM
re: Bank Attackers Used PHP Websites As Launch Pads
I was recently brought in to investigate why a specific Unix web server was suddenly running this DDOS code. None of this appears to be documented anywhere. The results of my investigations so far are disappointing and troubling. There are a lot of really vulnerable servers out there being used for free by the criminal community at large.

The criminals behind this operation are placing code on very vulnerable, unsecured unix servers running PHP. If that PHP server allows an "eval" command to be run that allows a script to perform high-level, near-root-level functions like shutting down logging and restarting the web server, they place a file on it that allows it to run ANY command it receives, using the "eval" function.

This is why there's a bunch of reports out there that talk about how the botnet "learning" or "gaining new powers". It's a really wide-open, non-secure server that will run *any* command. It's not "learning". It's at the mercy of any idiot who knows how to send it a large sequence of commands to run.

SiL
MarkSitkowski
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MarkSitkowski,
User Rank: Moderator
4/5/2013 | 4:58:18 AM
re: Bank Attackers Used PHP Websites As Launch Pads
Instead of waiting for your kernel to get overwhelmed with DNS replies for which it never asked, do this in your firewall:

block in on e1000g0 proto udp all
pass in on e1000g0 proto udp from our.dns.server1/32
pass in on e1000g0 proto udp from our.dns.server2/32
pass in on e1000g0 proto udp from any.xdmcp.box/32

The Unix kernel never sees any of that garbage, and the machine doesn't fall over.


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