Web Defacement attack the invader changes the visual appearance of the web page. The business competitor, Insurgent and extremist groups defame the reputation of the organizations and mislead public through these types of attacks. Manual monitoring and scrutinizing these attacks on web sites is a time consuming and tedious task for law enforcement agencies. Hence there is a need to develop a system which effectively monitors the content of web sites and automatically generate alarm for any suspicious or threatening activity.
Basically, websites are defaced by exploiting the vulnerabilities in
the web server and gaining root shell injecting malicious coded into the target page residing on the server.
In other cases, it may be done purely for fun, without any specific malice against the owner of a site. Hackers may penetrate a server and attempt to hack all the sites hosted there. These attacks sometimes include mocking notices to site owners and security personnel that highlight security weaknesses on the server or in the site's code. This type of website defacement is sometimes done in the name of a public awareness campaign to alert people to the vulnerability of a site. Ethical hackers, however, usually prefer to contact site owners and software companies to alert them privately.