Re: Odd identd behavior

From: Christopher E. Cramer (
Date: 11/14/05

  • Next message: k levinson: "Re: Odd identd behavior"
    Date: Mon, 14 Nov 2005 11:31:20 -0500 (EST)
    To: Mike Owen <>


    This looks like the output from an FTP server. If I had to guess, I would
    say that this looks like someone compromised a machine and installed a
    warez ftp server on the identd port.


    Christopher E. Cramer, Ph.D.
    University Information Technology Security Officer
    Duke University,  Office of Information Technology
    334 Blackwell St., Suite 2106, Durham, NC 27701
    PH: 919-660-7003  FAX: 919-668-2953  CELL: 919-210-0528
    On Thu, 10 Nov 2005, Mike Owen wrote:
    > While going through logs, and looking at mail server ident daemon
    > replies that don't fit the RFC-1413 standard, I noticed the following
    > string from a few servers:
    > "220 ..:: ?lit?-Cr?w Rulez ::..."
    > Looks to me like this group has been compromising mail servers, and
    > then instead of taking them down, lets them continue running, although
    > with a slight modification. They probably siphon off a copy of all
    > email transiting their servers as well, although without access to any
    > of these servers, I can't tell.
    > Interesting to note, if you send 2 ident requests, the second one comes back as:
    > "220 ..:: ?lit?-Cr?w Rulez ::....530 Not logged in..."
    > This leads me to believe this is the backdoor into these mail servers,
    > after all, if you're trying to hide a backdoor from port scans, or
    > dealing with stringent firewall rules, subverting an existing
    > listening process is a smart way to do it.
    > I have not notified the 0wned sites, mostly because I'm not really
    > sure what to do there. I can't email them, which means I have to
    > attempt to find a contact, and then call them. Then of course, the
    > person I manage to get a hold of needs to understand what I'm trying
    > to say, and I have to hope they don't then try and email someone
    > telling them that they have been compromised, thereby letting the
    > attackers know.
    > I'm curious as to whether anyone else has seen ident replies like this.
    > Thanks,
    > Mike

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