1st – Scan and identified malwares using this free tool https://sitecheck.sucuri.net if gives you files infected just delete them from your build.
2nd – Install sucuri plugin on your website and run again.
3rd – Change passwords on the admin users
4rd – Check for exploits on plugins on this site – https://www.exploit-db.com/
5th – Install Wordfence Security plugin
6th – Update urgently RevolutionSLider to the latest version