Server load... possible attack?

I have a server load problem (going from 1.80 to 4.50). Here's the first lines in top (sort by cpu usage). Does this means I am under attack?


PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
29771 root 24 0 840 840 576 S 32.9 0.0 0:21 0 /bin/sh /etc/apf/ad/antidos -a
30667 root 25 0 264 252 188 R 30.1 0.0 0:04 0 CROND
4716 root 23 0 1528 568 324 R 26.3 0.0 0:17 0 /usr/bin/perl /usr/local/bin/ipalert_statd

Also, a few minutes ago, a high % was used by "netstat -na"

Hope you can help! Thanks...

 

 

 

 

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