You might try something like
Code:
dirs=`find /var/www/virtual -type d -name 'olb'`; for i in ${dirs}; do rm -rf ${i}; done
.
I recommend replacing the "rm -rf" with a simply "echo" first to see what the impact of the code is, just to be safe.
However, your solution is just a temporary one. The more final solution would be to block the offending sites completely and to improve your security agains phishing (if possible).