Re: [PLUG] Hacked server - recovery

["Eric at Lucii.org" <eric@lucii.org>]

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It's a Linode and, yes, we're making a snapshot as soon as we've confirmed the spam is stopped.
Then, application-level off site backups will allow us to recover in a snap.
That is, until we the the approval to replace the [expletive deleted] software!

Thanks!


On 02/23/2012 06:52 PM, Brett.Yeagley@bentley.com wrote:
> Is this a physical box or a VM? If a VM I would get a snapshot or create a template after you are "clean" again. This way you can get back to a clean system quickly in the future. Of course the question then is figuring out they got in originally because the weakness would obviously still be there.
> If it's a physical box, I'd highly recommend thinking about virtualizing so have the increased flexibility!
> 
>  
> *From*: Tom Haines [mailto:hainest@gmail.com]
> *Sent*: Thursday, February 23, 2012 11:42 PM
> *To*: Philadelphia Linux User's Group Discussion List <plug@lists.phillylinux.org>
> *Subject*: [PLUG] Hacked server - recovery
>  
> You definitely want to run something like rkhunter to see what happened. My policy has always been to wipe the box and rebuild completely from backups. It's not worth risking that rkhunter missed something. 
> 
> On Thursday, February 23, 2012, Eric at Lucii.org wrote:
> 
> I'm trying to recover an Ubuntu-based web server that was hacked.
> It was/is running a 2.x version of OpenRealty that contains more
> vulnerabilities than I could imagine.
> 
> The hacker used it to send spam (no surprise.)  I was in a hurry
> so to stop it I just did apt-get remove postfix.  That worked in
> the same way that decapitation cures a headache.
> 
> Now that I *believe* I've cleaned up the malicious code and I'd
> like to re-install and turn on postfix again.  Before I do, is
> there a way to either throttle the email output (our expected
> output is a couple of emails a day from the contact form) OR fire
> off an alarm if there are more than <arbitrary low number> emails
> being sent in a single hour?  Perhaps there is yet another
> alternative that I've not thought of?  (So far, I've thought of:
> not re-installing Postfix, replacing the web site code, and moving
> to Tibet.)  I don't have authorization to replace this code yet
> and my wife won't move to Tibet so that's out too... for now.
> 
> Eric
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> ___________________________________________________________________________
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- -- 
#  Eric Lucas
#
#                "Oh, I have slipped the surly bond of earth
#                 And danced the skies on laughter-silvered wings...
#                                        -- John Gillespie Magee Jr
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___________________________________________________________________________
Philadelphia Linux Users Group         --        http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
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