full-disclosure - Re: Plague Proof of Concept Linux backdoor

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Message-Id: <E5AF0CD6-8EB1-4E1F-A9C3-7DA14FAAFA40@gmail.com>
Date: Sun, 22 Oct 2006 20:14:58 -0700
From: Andrew Farmer <andfarm@...il.com>
To: hijacker@...um.net
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Plague Proof of Concept Linux backdoor

On 22 Oct 06, at 04:29, hijacker@...um.net wrote:
> even if they have ssh access, there is still nothing they can do,  
> except
> to create two files in there $HOME directories containing  
> expressions from
> paths.h and sysexits.h ?
>
> Why would that be considered a backdoor?

The awk commands parse out the strings "/etc/passwd" and "/etc/ 
shadow" from
the headers. It's still rather easily detected - most of the rootkit- 
checking
programs will detect an alternate uid0 account very quickly - but it  
does
demonstrate an interesting way of avoiding target strings in the binary.

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