Symptoms that your website is hacked
1) Google says "This site may harm your computer"
If Google or Yahoo search engine result pages (SERPs) display a warning about your site, the most common cause is that your site was hacked. Please see the separate article about how to investigate and remove the Google / StopBadware warning message.
2) Visitors report getting viruses from your web pages
If visitors report to you that they get viruses or antivirus alerts from browsing your pages, it usually means your site has been hacked. Google and Yahoo will soon start displaying malware warnings about your site, so see the article about it, above.
It is, however, possible for your pages to deliver viruses even if your site hasn't been hacked. This can occur when your pages pull some of their content from third parties such as advertisers, and they got hacked or someone slipped a malicious advertisement into their lineup. That scenario is also discussed in the article above.
3) Visitors report being redirected to other websites
If you or other people try to visit your website but get automatically taken to some other website instead, it's another symptom of being hacked. It's a similar situation to the two described above and will eventually earn a Google or Yahoo! "badware flag". See the article referenced above.
4) Your traffic decreases dramatically and suddenly
Most web surfers stay away from sites that have the warning "This site may harm your computer".Those who continue to the site and get a virus or antivirus alert will leave immediately and not browse around. Either way, you'll see a drop in traffic. Anytime your traffic drops suddenly, investigate.
5) Your files contain code you didn't put there
If your pages suddenly contain links, text, or other objects you didn't put there, it's an indication you've been hacked. The source code of your pages (the text in your .htm, .html, or .php files, for example) should always stay the same as it was when you created it. If it changes, it's an indication someone figured out how to break into your site and change it. That should never happen.
One exception is that free webhosts sometimes require that you allow them to put ads into your pages. Occasionally someone thinks they've been hacked when it's really just the webhost's advertising code. If in doubt and you use free hosting, read the Terms of Service of your hosting plan.
6) Your search engine result page (SERP) listings suddenly change
When your site appears in search result listings, the pages listed should be pages that you know really exist, and the text shown should be related to what your site is about. If the listings suddenly show weird-named pages or text about topics unrelated to your site's content, it's another symptom of being hacked.
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I just want my readers of the blog to be aware of their privacy in the internet.