.htaccess file modification

Today a client wrote to me because he couldn't access his website. He only saw a blank page. We quickly determined that it had malware everywhere, but a change in its .htaccess file caught our attention. Something added these lines: Order Allow,Deny Deny from all It seem appropriate to prevent the spread of malware. The problem is that I don't know what made that modification in the .htaccess files. Is it some new cPanel feature that I wasn't aware of? Thanks!