How to solve the hijacking problem through website monitoring
At present, website hijacking is a favorite way of web page drainage in the underground industry, which is often realized through the websites of the government and educational institutions (with high weight), modifying the source code of the website, releasing parasites, setting up a secondary directory reverse proxy, and so on. Web hijacking can be divided into server hijacking, client hijacking, snapshot hijacking, search hijacking, etc.; the form of expression can be hijacked jump, can also be hijacked presented web content, is widely used in private services, and other profiteering industries.
Iis7 website Monitoring Detection
Test whether the website is hijacked, whether the domain name is walled, DNS pollution detection, website opening speed detection and other information.
Server hijacking is also known as global hijacking, the technique is to modify the dynamic language text of the website, determine the access source to control the returned content, and always achieve the purpose of website hijacking.
Asp/aspx/php hijacking
Global.asa, Global.asax, conn.asp, conn.php and other files are special in that each time a dynamic script is executed, the script is loaded first and then the target script is executed. So as long as you write the code to judge the user's system information in Global.asa (access source, etc.), if it is a spider visit, return the keyword page (the website you want to promote), and if it is a user visit, return to the normal page.
Client hijacking
There are also many methods of client hijacking, but there are mainly two kinds: js hijacking and Header hijacking.
Js hijacking
The purpose of js hijacking is to control website jump, hide page content, window hijacking and so on by implanting malicious js code into the target web page.
Js implantation technique: it can be written directly to the source code through the * * server, or in the database, because some pages will present the database content.
Js hijacking case
Effect: click on the page through the search engine (execute a section of js) to jump to the page; enter the URL directly to visit the page and jump to page 404.
Code:
Today=new Date ()
Today=today.getYear () +-"+ (today.getMonth () + 1) +"-"+ today.getDate ()
Var regexp=/. (sogou | so | haosou | baidu | google | youdao | yahoo | bing | gougou | 118114 | vnet | ioage | sm | sp) (. [a-z0-9 -] +) {1c2}\ / / ig
Var where = document.referer
If (regexp.test (where)) {
[xss_clean] (';')
}
Else
{
_ window.location.href= ".. /.. / 404.htm"
}
Analysis: through the referer to determine the source, if the referer is empty is to jump to the 404 page, if the search engine from the referer will also be displayed, and then write code to control the jump. If you only control the implementation to display different content, you can modify the php and asp code; if you need to hijack the search engine search box, you can write JS code to do the browser local jump. Of course, js functions can be expanded indefinitely, for example, it can control an ip to access normally for the first time in a day, the rest of the access can be redirected and so on.
Header hijacking
Write the following code in the source code:
one
It takes advantage of Meta Refresh Tag (automatic steering) to direct traffic away.
Comparison of techniques
The difference between client hijacking and server
Client hijacking: each visit to the web page gets the same web code from the server, but controls the effect of the web code rendered in the browser (such as whether to jump, etc.).
Server hijacking: changes the web code obtained from the server every time you visit the web page.
Client hijacking and server judgment method
The judgment method of client hijacking: just look at the front-end code of the web page rendered by the browser to see if the improper js or other sensitive content is referenced.
The judgment method of server hijacking: you can observe whether the source code is different by observing the back-end code of the website, or by changing ip, packet header and other ways.
