The free editions of MBAM and A2 do not have real-time protection so I put to test the on-demand scanners using 100 positive malware samples. Note: You will find in below screenshots that each malware sample have unique MD5. Legend: X means detected.
MBAM is able to detect 58 out of 100 malware samples while A2 Free detected 92. [Note: The screenshot shows it detected 93 because of the sample file (filename: sexvod.exe contains Player2.exe and SexPlayer.exe) is self-extracting file containing 2 files]. MBAM is able to detect 2 infected registries that A2 did not detect. The infected registry is located in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ for setup.exe and Install.exe. This registry key is often being taken advantage by malware or rogue installer because this particular registry key allows the redirection of the execution of one application to another.
MBAM failed to detect malware samples with .pdf, .swf, .zip and .rar file extensions.