Avira bfe-fw-fix.exe (repair tool for Microsoft BFE) False Positive?

[malje]

bfe-fw-fix.exe: According to Avira a fix for Microsoft Base Filtering Engine. MalwareBytes marks it as "Generic.Malware/Suspicious".

Is this a false positive, or a real malware that somehow got on avira website?

 

Avira description/instructions for use:

https://www.avira.com/en/support-for-business-knowledgebase-detail?kbid=1695

https://answers.avira.com/de/question/warum-ist-mein-avira-antivirus-emailschutz-und-webschutz-inaktiv-14137

https://www.avira.com/zh-tw/support-for-business-knowledgebase-detail?kbid=1695

Download URL:

https://www.avira.com/files/support/FAQ_KB_Download_Files/common/bfe-fw-fix.zip
 

bfe-fw-fix.zip Scanlog.txt

[miekiemoes]

Hi,

This is detected by our MachineLearning engine, which helps to protect even better against 0day threats. Unfortunately, as this is a heuristic engine, it's possible False Positives happen. Also see here for more explanation: https://forums.malwarebytes.com/topic/238670-machinelearninganomalous-detections-and-explanation/
Thanks for reporting these, as this helps to finetune the engine, so these won't be detected in the future anymore.

This should be fixed by now. Please give it some time (max 10 minutes) in order to have it populate, so detection won't happen anymore.
 

[malje]

It still gets detected!?

Scanlog2.txt

[miekiemoes]

Hi,

I can't reproduce detection on the file. Is this the exact same file as you attached? If so, then it might be because it keeps it cached.

Quit malwarebytes from the systemtray.

 

Then navigate to the following folder:

C:\ProgramData\Malwarebytes\MBAMService

In there, locate the file HubbleCache and delete it.

Restart Malwarebytes again. A new Hubblecache will then be created again, so it will properly pick it up and remember to not detect this anymore.

 

[malje]

Hi, followed your instructions and it gets not detected anymore 🙂. Whether it was the HubbleCache or the new 1.0.10048 package --- it's fine now, thanks.

Should one delete HubbleCache from time to time just to be safe from false-positives or -negatives?

[miekiemoes]

Hi,

No, normally the hubblecache doesn't need to get deleted. Just for the few cases, when there was an FP and the machinelearning detection still appears after a few days.

Edited April 8, 2019 by miekiemoes