I gotta admit that I was attacked, I mean my sites was attacked, but it is made to be that my site is still up, however, my .htaccess files was breached. The content code is blank and all my redirections are gone. What should you do if this situation arised?

Get the htaccess backup copy up and overwrite this hacked htaccess file. If there is no backup, you may just go into wordpress admin and goto the permalink setup, then save. It will automatically create a new htacess file.

Change all the passwords, backup often after you have make changes to the htaccess file.

Becareful with new plugins you are installing. There are some malicious plugins lure you into installing them to do certain thing only to provide an access to your site directory files.

When there is a update of newer wordpress, be sure to update to latest version.

If possible, change the 301 redirect to html redirect or use shortlinks like goo.gl or bit.ly

Hope all are not suffering the fate like I had encountered as I need to take half a day to clean up as there are just too many redirect in there.