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Webshell is a kind of software which usually assists the administrator to manipulate the server. But in some cases, attackers will use some malicious webshells to control the server to achieve malicious purposes. For attackers, webshell is a kind of backdoor, generally written in some scripting language like ASP, PHP, or JSP. These kinds of web scripts are able to create dynamic interactive sites, so the attacker is able to control the web server through web pages. These behaviors will be recorded in the access log [10].

In order not to be discovered by the administrator of the website, webshells usually undergo a lot of distortion. Some escape methods are as follows:(i)Pass parameters with less common fields: while websites generally use request field to pass parameters, this method uses some unusual fields such as HTTP referrer and user agent.(ii)Encrypt sensitive features: attackers use some common encryption algorithms such as base64 [12] and rot 13 to encrypt some key functions. For a greater probability of escape, some tools even customize encryption algorithms.(iii)Multiple encoding and compression: hackers change the original static features of the code by multiple encoding combined with compression technology to reduce the possibility of detection.

We did some research on the previous detection of webshell. At the earliest, webshell detection takes a manual identification method. This is the oldest and most traditional way to detect webshells, which places high demands on the administrators of the website. Administrators are supposed to have a comprehensive grasp of the website files and have a high recognition ability for some newly added exception files [13], such as some naming files, passby.php, pass.asp, and a.jsp. Besides, these small files should be treated carefully because there are probably one word Trojans. After finding suspicious files, we need to analyze the contents of the file. The most thorough way is to take a look at the entire file carefully, but it will take a bunch of time. A better way is to search for some sensitive functions such as , , and and check their parameters carefully [14].

Afterwards, we found the webshell communication, and we can easily find the webshell by counting all the access paths of the session. Besides, if the administrator is familiar with the files included in website dictionary, he may not need to perform statistics to find the webshell. 2b1af7f3a8