i got ossec notification for 

Integrity checksum changed for: '/etc/xinetd.d/check_mk'

and surprisingly size in all server monitored by ossec has changed file's to 
same size, and all server alerted on check_mk. [checksum history of file says 
its diff and comparing previous there has been only 1 change and this is 1st 
time]

however there is no change being made to this file inside, touch date .. etc in 
all 50/60 boxes are same, filesize, too.

if we get forced to think about backdoor, someone has managed to break in thats 
not quite what status of server itself says. [other checks login report, ssh 
integrity, keys, validation of users and so on and so forth].

I am thinking more towards false positive, but that would not be the case in 
all boxes, getting quite clueless. any heads up?

Regards
Ashish

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