Cybercriminals are using the most sophisticated techniques to bypass the security controls in various organizations such as IT, medical, manufacturing industries, energy sectors, even government entities. There are various types of backdoor which can be written in various languages, for an example if the backdoor was written in ASP then it can run on.net based servers and if its written in PHP then it will run on the servers that run on. PHP. The organization should learn how to protect your web applications from vulnerabilities such as a backdoor, SQL injection types of attack with the best WAF solutions.”]
Source: https://gbhackers.com/advanced-backdoor-obfuscation/