Restoring file and directory permissions

Good day.
Yesterday I accidantally set wrong file permissions for all files and directories under /var/www/vhosts with command "chmod -R 644 *". Is there any way to restore file permissions that were there right after Plesk installation and operation?
I have Plesk 8.6.1.
The list of directories is:
mydomain1.ru
...
mydomain9.ru
chroot
default
.skel