![]() ![]() The EXE image will be loaded into memory by Windows but execution will not begin until the ResumeThread API is used. This is possible because under Windows, a process can be created in suspend mode using the CreateProcess API with the CREATE_SUSPENDED parameter. Your stub file will then extract the encrypted data from itself, decrypt it, then extract and run it in memory (to bypass heuristic detection). After they finish their task the Stub encrypts them again.īasically a crypter is going to take the contents of an infected file, encrypt them (to bypass signature detection), and place it at the bottom of a seemingly virus-free file called your “stub”. Runtime: Scantime + only parts that are needed to execute a specific task are decrypted during runtime.When it is in the memory in a decrypted form it is detectable by antivirus software. When the malware is executed the Stub decrypts the malicious part of the binary and it is loaded to memory. It makes static analysis of your binary difficult because the malicious part of your malwares binary is encrypted. ![]() Scantime: those type of crypters make your malware undetectable from antivirus software while your malware is not executed.First of all you have to distinguish between "scantime" and "runtime" crypters ![]()
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