Hi,
I've been running rkhunter 1.2.8 daily on an FC4 machine for several  
months.
A couple of days ago I started seeing the following in the rkhunter.log:
...
[04:09:54] /bin/dmesg Hash NOT valid (My MD5:  
d1720cee15e8beebe20dff0ec9b48c6d, expected:  
1dd06fe152f4ab4807e148bb500ec131)
[04:09:54] Using whitelists to compare MD5 hash (searching for  
d1720cee15e8beebe20dff0ec9b48c6d)
[04:09:54] No whitelisted MD5 hash found for /bin/dmesg
[04:09:54] MD5 hash for my file (/bin/dmesg) is  
d1720cee15e8beebe20dff0ec9b48c6d, but is not in database
[04:09:54] End of whitelist compare
[04:09:54] Checking /bin/dmesg against hashes in database  
(1dd06fe152f4ab4807e148bb500ec131) failed
[04:09:55] RPM info: your package 'util-linux-2.12p-9.7'
[04:09:55] RPM info: packages in database:
[04:09:55] ---
[04:09:55] 180:/bin/dmesg:d1720cee15e8beebe20dff0ec9b48c6d:-:-:util- 
linux-2.12p-9.7
[04:09:55] ---
[04:09:55] /bin/env hash valid, found in database
[04:09:55] /bin/grep hash valid, found in database
[04:09:55] /bin/kill Hash NOT valid (My MD5:  
51d21d16200ac56857f7981708dc39ea, expected:  
0298eccfee61053ff43ebcb6cb87839c)
[04:09:55] Using whitelists to compare MD5 hash (searching for  
51d21d16200ac56857f7981708dc39ea)
[04:09:55] No whitelisted MD5 hash found for /bin/kill
[04:09:55] MD5 hash for my file (/bin/kill) is  
51d21d16200ac56857f7981708dc39ea, but is not in database
[04:09:55] End of whitelist compare
[04:09:55] Checking /bin/kill against hashes in database  
(0298eccfee61053ff43ebcb6cb87839c) failed
[04:09:55] RPM info: your package 'util-linux-2.12p-9.7'
[04:09:55] RPM info: packages in database:
[04:09:55] ---
[04:09:55] 180:/bin/kill:51d21d16200ac56857f7981708dc39ea:-:-:util- 
linux-2.12p-9.7
...

About 50% of the binaries checked were reported as [BAD]

The machine has not been updated at all in the last few weeks - can I  
therefore assume that it has been compromised? Or is there a  
possibility that this is a false positive?

Many thanks for your help and advice.

Al Fleming

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