![]() ![]() The problem there is that web shell authors are fully aware of this technique, and deliberately write their code in a very opaque and confusing way that makes pattern matching extraordinarily difficult to do with any real accuracy. ![]() ![]() This works well if an attacker is using a known web shell, but quickly falls apart when confronted with custom code.Another technique is to use pattern matching to look for code fragments (down to the level of individual function calls) that are commonly malicious, such as calls out to the system to manipulate files or open connections. One approach is to have an automated system look at the contents of newly uploaded or changed files and see if they match a known web shell, just as antivirus software does with other forms of malware. ![]()
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