Abusing callback to run shellcode.
Eksekusi shellcode dengan CryptVerifyMessageSignature.
BOOL CryptVerifyMessageSignature (PCRYPT_VERIFY_MESSAGE_PARA pVerifyPara, DWORD dwSignerIndex, const BYTE *pbSignedBlob, DWORD cbSignedBlob, BYTE *pbDecoded, DWORD *pcbDecoded, PCCERT_CONTEXT *ppSignerCert);