A backdoor attack is a type of malware by which authorized and unauthorized users can get around normal security measures and gain high level user access (root access) on a computer system, network, or software application. Once remote access is granted, cybercriminals can use a backdoor to steal personal and financial data, install additional malware, and hijack devices. A backdoor attack is stealthy, and cybercriminals often slip in undetected.
Backdoor installation is achieved by taking advantage of vulnerable components in a web application. Once installed, detection is difficult as files tend to be highly obfuscated.
Backdoor trojan injection is often done in a two-step process to bypass security rules preventing the upload of files above a certain size. The first phase involves installation of a dropper (a small file with the sole function of retrieving a bigger file from a remote location). It initiates the second phase; the downloading and installation of the backdoor script on the server.

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