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Malwarebytes False Positive for Win 7 Monthly Security Rollup KB3197868
Woody Leonhard just posted an article on AskWoody.com titled Malwarebytes stumbles with false positive on KB 3197868, the Win7 November Monthly Rollup warning that some Win 7 SP1 users could have corrupted their system files with a recent MBAM scan after some of the 500+ files in the KB3197876 Monthly Rollup that were not digitally signed by Microsoft were detected as false positives. Symptoms can include "locked up systems, and machines that take five minutes or more to shut down."
From what I understand, Win 7 SP1 users could potentially be affected if they ran a MBAM scan in the 4-day period between 08-Nov-2016 (the release date for the November 2016 Patch Tuesday updates) and 11-Nov-2016 when MBAM released database version v2016.11.16.11 to fix the problem. I don't see a large number of recent reports in their False Positive board at https://forums.malwarebytes.org/forum/42-file-detections/ so it doesn't appear to be a widespread problem.
Malwarebytes posted a support article What can I do if I have been affected by the Kernel32.dll false positive? in their Anti-Malware for Business FAQ on 17-Nov-2016, but I assume users of both their Home and Business products could be affected by these false positive detections.
32-bit Vista Home Premium SP2 * Firefox v50.0 * NIS v126.96.36.199 * MBAM Premium v2.2.1