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Symptoms of a website is hacked and the major types of attacks that could expect to experience and the resulting damage on the site. Protection is the most important matter in peoples life. Small things in our daily life also need protection, and when it goes to computer, for sure we need to extra protection. And if we go to online security plays a big role there. There are many way where ones computer and the personal documents can be hacked, and there are a group of people which their work is to hack computer or website. Sometime people are not aware that their website has been hacked. There are some symptoms that a website had been hacked.
In order to launch an attack, a malicious attacker needs a method, tool or technique to exploit various vulnerabilities in systems, security policies, and controls. A malicious attacker can use different methods to launch the same attack. Therefore, the defense strategy must be customized for each type of method used in each type of threat. A detailed discussion of these can be found in "Security Threats."
Mostly all of the search engine on the internet will provide search engine result pages (SERPs). It will display a warning about the site, the most common warning appear on a new window and will show that 'The site has been hacked.'
The administrator of a website can know when visitors report that they get viruses or antivirus alerts when browsing the infected page, it usually means that the site has been hacked. Example, Google and Yahoo will start displaying malware warnings about the site.
Moreover, it is possible for the pages to deliver viruses even if the site hasn't been hacked. This can occur when the pages pull some of their content from third parties such as advertisers, maybe they got hacked or someone slipped a malicious advertisement into their lineup.
Other than that, when the administrator or other people try to visit the website it will automatically take 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".
Basically, 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. Whenever the administrator sees a drop in traffic, they should investigate and find out about the problem.
Besides that, when the pages suddenly contain links, text, or other objects that the administrator didn't put there, it's an indication that the site has been hacked. The source code of the pages (the text in .htm, .html, or .php files, for example) it should always stay the same as it was when the administrator created it. If it changes, it's an indication someone figured out how to break into a site and change it. That should never happen.
One exception is that free webhosts sometimes require the administrator to allow them to put ads into their pages. Occasionally, someone thinks they've been hacked when it's really just the webhost's advertising code. If the administrator is in doubt and they use free hosting, read the Terms of Service of the hosting plan.
When the site appears in search result listings, the pages listed should be pages that they know and really exist, and the text shown should be related to what the site is about. If the listings suddenly show weird-named pages or text about topics unrelated to the site's content, it's another symptom of being hacked.
Besides that, they also hack to add new files and to add executable programs to let the attackers "manage" the website files remotely, grant them access even after the administrator clean up (back doors), send spam, connect to IRC servers for botnet communications, mass-attack other websites, etc. Subvert the operating system, putting the entire server under the control of a remote operator.
However, the hacker's rarely do all those things because a server so massively compromised would be quickly noticed, and they don't want that. Usually, hacker's do some of the things mentioned, the administrator would probably have to clean up malicious changes in the website files or database tables, and look for new files that shouldn't be there.
To prevent hackers from hacking the website is the administrator must maintain strong security on the computer that they use to manage the website. Install good quality antivirus software to keep it free of viruses and Trojan. Malware can do all its damage, steal the data, and even delete itself, before the administrator get around to doing a manual file scan.