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Investigating Hacker, Worm, or Backdoor

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I've been investigating a strange lease on one of my DHCP servers thatshould
not be there for any legitimate reason.
The DHCP server is embedded within my firewall: Astaro Security Linux v5
which I've felt is a robust and secure system. I'm puzzled about what I'm
seeing here, though.

Here are the logs from the server:
2004:11:01-12:46:32 (none) dhcpd: DHCPDISCOVER from 4d:c8:43:bb:8b:a6 via
2004:11:01-12:46:33 (none) dhcpd: DHCPOFFER on to
4d:c8:43:bb:8b:a6 (detective)

In my investigation I've run into several people throughout the world who
have seen this exact MAC address and many reports of this same host name,
"detective".**I'm beginning to suspect a hacker, a backdoor on the
firewall, a worm of some kind, or a Microsoft security "feature". No way
to tell.

Here are links to some of the folks who have reported similar findings: [in French]

If you have access to your company's dhcp server, you might take a quick
look at the logs.**

Here's my network setup:
Astaro Security Linux (Firewall) (3 interfaces: wireless, internal &
SuSE Linux 9.1 Server
SuSE Linux 9.1 Workstation
Windows Server 2003 Test Server (now running "for small Business" package)
Windows XP/SuSE Linux 9.1 Workstation

Can anyone help shed some light on this?

Much thanks for any help

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