Hi, I contacted my server provider (hostgator) about this issue, they have scanned and cleaned all the malware scripts which was even injected in the root domain, then I submited to Google webmaster tool for “Attack Page Website message” removal and within 24 hours all sites are back to normal. Do contact your server provider because this is what you cannot clean on your own quickly. I found Hostgator is extermly helpful that is why I had shifted my sites from Godaddy to Hostgator.