Just to add a little to what Hans said,

I did a little research on this on my system, and determined the following:
	.udev is used by the hotplug/automount system to maintain a dynamic database of connections and failed connections
	.static is used by udev to maintain a list of non-removable (static) devices
	.initramfs is used by udev to manage the udev filesystem(which is derived from the ramfs filesystem)

der.hans wrote:
> Am 04. Aug, 2006 schwätzte alex@crackpot.org so:
> 
>> I run the program rkhunter daily to search for rootkits.  Recently, it
>> found some hidden directories in /dev, and reported them as suspicious.
>>
>> /dev/.static
> 
> Probably be udev. Note that it's a directory.
> 
> dpkg -L udev | grep static
> 
> Nothing for that, so it's probably created by some udev function.
> 
>> /dev/.udev
> 
> Definitely udev.
> 
>> /dev/.initramfs
>> /dev/.initramfs-tools
> 
> Probably udev.
> 
> Check the udev package for what files it needs.
> 
> rkhunter probably needs to know about these files and not report them.
> Hopefully it'll still check them to make sure they're the files they're
> supposed to be.
> 
> ciao,
> 
> der.hans
> 
>>
>> This is on a Debian machine.
>> # uname -a
>> Linux kiltlifter 2.6.16-2-686 #1 Sat Jul 15 21:59:21 UTC 2006 i686
>> GNU/Linux
>> # more /etc/debian_version
>> testing/unstable
>>
>> I have searched the rkhunter mailing list for a mention of these files.
>> Nothing.  I've searched Google.  Nothing yet.  I've tried to see if they
>> belong to a package (using dpkg -S).  Nothing.  I've wandered around in
>> the directories and tried to identify the contents, but I haven't had any
>> breakthroughs.
>>
>> Can anyone help me identify these directories and verify that they should
>> actually be on my system?
>>
>> I wish I could say what changed on the day that I first saw this warning.
>> This is a personal server, and though I keep its packages up to date, I
>> don't have tons of time to invest in its maintainence.  I've had this
>> warning from rkhunter for a while, but haven't had time to investigate.
>> (Very sorry, I'm sure that information would be helpful...)
>>
>> thanks,
>> alex
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> 
> 
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