If the file opened successfully, point fp to the last character using fseek function.Ĭreate a variable length of type ‘long’ to store the position of the file pointer fp. Perform error handling to check if the file has opened successfully. Using fp, open the first argument (file) in rb (read-binary) mode. ALGORITHMĭefine a macro XOR_VAR along with your key.Ĭreate a character pointer buffer and initialize it to 0.Ĭreate two strings for input file and output file.
#Dev point crypter software
Testing the Cryper: The Crypter will then be tested on services like and other antivirus software to prove the successful bypassing of Malware from security software.Ĭheck out Implementation_Guide.docx for step by step procedure. Deobfuscation will be carried out using the same keys from encryption process. The encrypted contents will be then written to a new file and the stream will be closed to prevent data leakage.Įxecution and Deobfuscation: The contents of the file will be deobfuscated when it is executed on the victim’s machine. The contents of the file will be XORed.Ĥ. The contents of the file will be retrieved using the fgets() function until it reachs EOF.ģ.
The file will be read using the function fopen() and mode ‘r’.Ģ. At the end of this step, an executable file called payload.exe will be created.Įncrypting the Malware using File Handling and XOR Encryption:ġ.
#Dev point crypter windows
Command used is - msfvenom –p windows/meterpreter/reverse/tcp to create a reverse tcp meterpreter shell for windows 64bit OS. The entire implementation of this project can be summarized in the following steps:Ĭreating a Malware: A windows meterpreter payload is crafted using msfvenom. When the obfuscated file is opened by the victim, the Crypter will then start the de-obfuscation process by using the same key it used to encrypt it in the first place. The obfuscated contents will then be written to the previously created output file. The Crypter will then extract the contents from the malware and obfuscate them using XOR encryption algorithm. The Crypter will open the malware from the disk while creating another output file to the disk. The project aims at building a Scan-Time Crypter in C, that can assist a malware in bypassing antivirus software.
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