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Date:      13 Sep 2001 12:08:27 -0400
From:      Vivek Khera <khera@kcilink.com>
To:        questions@freebsd.org
Subject:   Re: What is ".nfsA09b24.4" doing in =?iso-8859-1?q?n=B4my?= /bin?
Message-ID:  <x7k7z3rs3o.fsf@onceler.kciLink.com>
In-Reply-To: <EB513E68D3F5D41191CA00025558810150D6F5@mailserv.xpert.com>
References:  <EB513E68D3F5D41191CA00025558810150D6F5@mailserv.xpert.com>

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The following message is a courtesy copy of an article
that has been posted to ml.freebsd.questions as well.

>>>>> "YB" == Yonatan Bokovza <Yonatan@xpert.com> writes:

YB> Looks like a rootkit to me.

Have you every used NFS before?  These are files NFS uses to keep
remotely open files available when they are deleted locally.  This is
necessary for the semantics of the open/unlink sequence in unix.

Usually they are cleaned up, but depending on various things, these
files may be left behind.  If your NFS server lets you delete them, go
ahead and do so; otherwise it will do so later.


YB> Hadn't my HD died I could verify my concern, that
YB> this is Open/FreeBSD rootkit I found somewhere else.
YB> http://www.cert.org/security-improvement/modules/m06.html
YB> or in short form: newfs, reinstall, restore backup.

YB> Yonatan.

>> -----Original Message-----
>> From: Micke Josefsson [mailto:mj@isy.liu.se]
>> Sent: Thursday, September 13, 2001 12:35
>> To: freebsd-questions@freebsd.org
>> Subject: What is ".nfsA09b24.4" doing in n´my /bin?
>> 
>> 
>> I recently found these files in /bin  on an exported filesystem:
>> 
>> -r-xr-sr-x  1 root  kmem    32376 18 Jun 17:13 .nfsA6bcb4.4
>> -r-xr-xr-x  1 root  wheel  279972 18 Jun 17:13 .nfsA6c834.4
>> -r-xr-xr-x  1 root  wheel  164332 30 Maj 11:57 .nfsA76da4.4
>> 
>> What are they? Can I delete them?
>> 

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