false positive, or server hacked?

[Piotr Gnyp]

Hi,
I`m running FreeBSD 5.2.1-p4, I`ve just installed new version of
chkrootkit 0.43 from freshports, and report follows:
Checking `date'... INFECTED
Checking `lkm'... You have   115 process hidden for readdir command
You have    23 process hidden for ps command
Warning: Possible LKM Trojan installed

ll of /bin/date
-r-xr-xr-x  1 root  wheel  14776 30 Mar 13:20 /bin/date

Please advice.