/usr/local/apache/proxy/ security problem?

I've found 3 files under /usr/local/apache/proxy/

f3
dosnet
pkt.c

I've found that f3 is running nobody:
./f3 IP

How can I stop these kind scripts?
How did they get to /usr/local/apache/proxy/?
How can I find who was using these scripts?

 

 

 

 

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