It seems that one of the website I am hosting is being defaced by IDBTE4M I am resolving the problem with the siteground. Just submitted a ticket to them. So just a friendly reminder to backup your site because bad things do happen.
Got a response from the siteground team. They said they have scanned and found nothing suspicious. I checked the web directory and found idbteam4 folder in there. Then I restored it to the time the developer told me to.