2/11/2024 0 Comments Crypter 2018Removes the Zone.identifier of the file ( :Zone.identifier), this will avoid Windows to inform the user about the execution of a not trusted file Let’s start from the bottom up below the main steps executed at start Function name top: naive obfuscation of some main native AutoIT functions + basic strings obfuscation function.Nevertheless, the overall code can be broken up in 3 blocks. This sample in particular is not at all heavily obfuscated and many core functions still have a descriptive name (i.e. Which, if it is the case, will lead to a fake message displayed to the user and simply stop executing.Īt this stage, no additional anti-analysis checks are performed and the execution proceeds just flawless, passing control to the AutoIT code interpreter. In order to avoid execution (if) monitored, the first layer of the loader only checks if it is being debugged, the same is achieved calling the good old isDebugPresent at offset 0x00403b7A. Final payload (for this sample, DarkComet) does its dirty job.Executes RunPE (via shellcode), in this case, self-process hollowing. Runs decryption routine on one embedded PE resource.
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