Your battery has been infected with 2 viruses. Click to remove. Phone vibrates like crazy :'( My colleague was surfing the net with my NEW android in my absence. I do not know what he surfed but when I clicked "back" in the browser ..It took me to a website called "cookmobiapps.xyz" and my mobile just started vibrating continuously with a message "your battery is infected with 2 viruses, hit OK to remove. DO NOT LEAVE WEBPAGE" Everything on the screen froze so I clicked OK, then a screen appeared asking me to download an app from googleplay (which I didnt). My phone works fine now and I have not tried hitting the back button again. Why did this happen? What was that message about? Its a new phone and Im very worried :'(
Reposted from comments by user154667:


  I installed 360 Security antivirus for Android, which detected a malware (that I removed). I deleted the history, cookies, cache, etc. I cleared the cache through some app manager, and it worked. I'm not getting those malicious websites now when I hit Back.