Anti-Malware (MBAM) is one of a number of anti-virus software applications readily available to you, some of which are free downloads. While the majority of anti-virus software is legitimately helpful and effective, some rogue anti-virus software out there can be just as devastating as the viruses they claim to counteract.
Anti-Malware include support for Windows 2000, XP and Vista operating systems, windows, fast scanning, full scans for all of your drives and updates to your database that are released at least once every two days. It also provides a quarantine feature to hold threats and then resolve them when it is convenient for you.
So, to be clear, Malwarebytes is a legal and legitimate anti-malware software application.