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Best fud crypter3/21/2023 However, my happiness was short lived as my backdoor could now bypass static analysis of all AVs, but at runtime, Windows Defender was detecting it as a virus and deleting the backdoor and killing the meterpreter session. The point of writing to standard output is to give the user the ability to easily save the encoded payload to another file or process it using any other command tools. After the encoding process is done, the result is written to standard output and exit. By doing that and getting the XORed shellcode and putting it in the loader.cpp file and compiling it, I finally managed to bypass all AVs, including Windows Defender.Įncoder basically goes through the whole target payload from the data section and transforms each byte of it using a specific key. However, the backdoor was still getting detected by only one AV, which was Windows Defender.Īfter that, I tried to encode the payload using an encoder (which will be covered later) while creating the msfvenom payload. Thereafter, I passed the output file through the XOR cipher to get the XORed shellcode which I can then put in the loader.cpp file. Therefore, I had to create a payload using msfvenom by using the following command: If the bits are different, the result is 1. If the bits are the same, the result is 0. XOR compares two input bits and generates one output bit. E Xclusive OR Encryption is a simple symmetric cipher.
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