Typically, Backdoor malware is one of the initial stages of the cyber attack. Hackers find vulnerabilities on the site and upload arbitrary files (in this case a Backdoor) to your site and then access it via browser. This is how a plain old Backdoor looks like:
For more information about a Backdoor: FilesMan Backdoor Malware On Your Computer
Using Legitimate Code Wrappers To Avoid Detection By The Web Malware Scanners
The above-mentioned type of backdoor has identifiable signatures which are distributed among the security vendors and then utilized in the traditional (signature-based) detection algorithms. To bypass such standard approach to the malware protection, hackers are now obfuscating or using wrappers to hide their code from the malware scanners. Once obfuscated, the same Backdoor malware code will look like this :
Fopo is just one of many online obfuscators over the internet that are free to use. These obfuscators were made to protect the code from stealing and make it harder to debug by other developers. But at this time, it was used for malicious intent.
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