grepbase64

#!/bin/bash
# Author:  Michal Ambroz <rebus@seznam.cz>
# License: GPLv2+
#
#     Copyright (C) 2018  Michal Ambroz <rebus@seznam.cz>
#
#     This program is free software: you can redistribute it and/or modify
#     it under the terms of the GNU General Public License as published by
#     the Free Software Foundation, either version 2 of the License, or
#     (at your option) any later version.
#
#     This program is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#     GNU General Public License for more details.
#
#     You should have received a copy of the GNU General Public License
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Example:
#     grepbase64 malware.vba
#


grep -P -e '([A-Za-z0-9+\/]{4}){3,}([A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?' "$@"