Trojan Activity - Running Perl With High CPU Usage, With User Apache
Running programs named Perl with Heavy CPU usage, with the ownership of user apache.
We found the problem on Fedora 3 and Fedora 6.
In our case, it was the result of a Trojan activity.
Quick Solution
Check the cron jobs of user apache
crontab -u apache -e
*/1 * * * * perl /tmp/.tmp/tmpfile
delete the cronjob entry.
Also delete the file /tmp/.tmp/tmpfile
also added "apache" to the file /etc/cron.deny
That's all
Problem and solution in detail....
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For about a couple of days (no configs were changed) I am experiencing high cpu usage from time to time. At this moment and what I can see is this: Sites are using low cpu resources, top process is mysql + 1-2 php defuncts replacing each other, after that - httpd requests Something happens and php are starting to use more cpu thant it should. Cpu top usage shows all php files in all accounts replacing each other (index files, scripts there are like wordpress, forums, etc). Server crashes... Or I kill all php processes, restart apache and it goes back to normal mode again. I had the same issue months ago, just cpu usage was even more agressive and much often. After days of checking, I've found that it was Curl and/or Curlwrappers which were cauisng that. After recompiled apache without them (left curlssl only), cpu load was always stable.
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