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Known Issues & Conflicts - Updated April 16, 2020


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Last updated: April 16, 2020

Malwarebytes 3.0 (MB3) -- Known Issues in Anti-Exploit Module:


MBAE Standalone -- Known Issues and Conflicts:

  • Unload protection blocks after upgrade to a new version of MBAE: Some machines with Malwarebytes Anti-Exploit upgrading from any version above 1.13.x.99 to a newer version (for example - 1.13.x.164) have been seeing "Unload protection" blocks. These are false positive alerts and from our initial analysis, we see that these blocks are triggered only during/immediately after the upgrade and do not recur after the upgrade is complete.The team is looking into providing a resolution soon.
  • FireEye Endpoint Agent Version: 24.9.0: We have identified a hooking incompatibility (specifically, LoadLibraryEx API) with FireEye Endpoint Agent on Windows 10 machines which results in Internet Explorer crashes. Please contact FireEye to report this issue. 
    The only known workaround is to either uninstall FireEye Endpoint Agent or unshield IE as a protected application in Malwarebytes Anti-Exploit.
  • Malwarebytes Anti-Exploit blocks Microsoft Office applications on VMware Horizon View. The problem comes from VMware injecting its dll (vmwsci.dll) in allocated memory from APC. We cannot exclude this behavior from within the product since it reduces the protection offered by the product. Instead, as a workaround, users can disable MBAE Settings->Advanced Memory Protection-> Malicious Return Address detection for MS Office. Please also make sure to report this issue to VMware.
  • Sophos Intercept X(HitmanPro) Both MBAE and Intercept X are exploit mitigation products providing similar functionalities. However, MBAE provides a more comprehensive protection due to its Layer0 and Layer3 protections. More information here. It is not recommended to run both products alongside each other, and if done so, will result in unpredictable crashes/hangs of protected applications. We suggest that you uninstall/disable the Intercept X module of Sophos EndPoint security on computers where MBAE is installed.
  • Enhanced Mitigation Experience Toolkit (EMET). Both EMET and MBAE are exploit mitigation products that apply similar protections and apply similar API hooking & techniques. However, MBAE provides a more comprehensive protection due to its Layer0 and Layer3 protections. More information here. It is not recommended to run MBAE and EMET together. Some users have reportedly managed to run both together by tweaking the EMET techniques, but this is not a Malwarebytes officially supported configuration.
  • Trusteer Rapport. Trusteer's "Pinpoint technology", which tries to detect the presence of Trusteer through a webpage, introduces a conflict whereby it cannot detect the presence of Trusteer's hooks. There is a long history of complaints about IBM's lack of interest in fixing Rapport's conflicts with dozens of security applications. We've managed to make Trusteer work with most web browsers but in the case of Pinpoint technology, it does not know how to deal with basic chained API hooks. We are working on a new mechanism to handle these types of conflicts.
  • ESET9. A bug exists in the API hooking mechanism of ESET9 that triggers when using ESET9 + MBAE + Firefox. The Firefox crash shows a stack overflow typically generated by ESET. This problem is likely also happening between ESET9 and other security products as well.
  • New Comodo Bug. We found a second new bug in Comodo which may cause conflict with MBAE and result in browsers not being able to open correctly. It seems when MBAE injects after Comodo there is no problem, but if Comodo injects after MBAE then Comodo doesn't handle the chained hooks correctly. A fresh re-install of MBAE might temporarily solve the problem (as it sometimes makes MBAE handle the API hooks after Comodo) but the definite bug fix must come from Comodo.
  • McAfee (new): We recently identified another bug in the hooking engine of McAfee HIPS that causes crashes of protected applications. 
    McAfee HIPS hooking engine fails to disassemble an instruction and generates a breakpoint exception in HcThe.dll resulting in the crashes.
    HcThe.dll hooks a couple of Windows APIs and in some specific cases, if a function is already hooked and McAfee HIPS attempts to hook this API, it fails to disassemble the instruction and generates a breakpoint exception. This conflict is not just with MBAE but with other security products dealing with API hooks as well. If you are experiencing this issue, please contact McAfee to report this bug to them. We are working on a new mechanism in MBAE to handle these types of issues caused by buggy third-party code.
  • McAfee HIPS (old). We have identified an API hooking bug in older versions of McAfee HIPS that may cause a conflict with MBAE. The bug is located in the HCTHE.DLL component of McAfee HIPS. Simply disabling McAfee HIPS does not disable the hooking or solve the bug, so the solution is to upgrade to a fixed version of McAfee HIPS. We are working on a new mechanism in MBAE to handle these types of issues caused by buggy third-party code.
  • Websense Endpoint hooks KernelBase!LoadLibraryExW API via QIPCAP64.DLL. MBAE also hooks this API. However, due to a bug in Websense's hooking mechanism, it improperly handles the hook and may create crashes when opening Word, Excel or other applications. If you are experiencing this issue please contact Websense to report this bug to them ("bad attempt to copy jmp qword instruction rip based"). We are working on a new mechanism to handle these types of conflicts.
  • Ghostery Add-on for Internet Explorer 11 alongside MBAE, or any other product that hooks wininet APIs, makes IE crash. This is because Ghostery is making incompatible API hooks, i.e. without taking into consideration that there might be other products hooking the same APIs.



Edited by Arthi
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