False-Positive: Malware.Ransom.Agent.Generic -> Excel.exe / Winword.exe

[anyWARE-Mainz]

Hi,

we got 2 different detections in the past 2 weeks on two different clients. Today it was:

1)
Malware.Ransom.Agent.Generic
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Excel.lnk
Blocked By Real-Time Protection

2)
Malware.Ransom.Agent.Generic
C:\Program Files\Microsoft Office\root\Office16\EXCEL.EXE
Blocked By Real-Time Protection

One or two weeks before before it was "Winword.exe" on a different client.
The Product had to be repaired - restoring the .exe did not work.

This is urgent, because just restoring out of quarantine does not work.

Regards,
Daniel

[Porthos]

@miekiemoes Could you look in to this.

[LiquidTension]

Hi @anyWARE-Mainz,

Please run the Malwarebytes Support Tool on the affected machines and gather logs: https://support.malwarebytes.com/hc/en-us/articles/360039023453-Upload-Malwarebytes-Support-Tool-logs-offline

The logs provided will help us investigate this issue further.

[anyWARE-Mainz]

Hi LiquidTension,

where may I Upload the Log - any specific mailaddress?
I will rather not upload them public.

[anyWARE-Mainz]

Btw. - I can not edit my post, so this is, what the Support Tool says (see screenshot):
 

[anyWARE-Mainz]

... and apologies - wrong forum as I see at the moment. Please move the thread to the business forum / endpoint protection. Thank you.

[LiquidTension]

Hello,

It was most likely the copy to desktop operation that failed. Does the following file exist? %temp%\mwb*tmp\mbst-grab-results.zip (the '*' represents random characters)

[alexl010]

We have been battling this issue.  Do you also use McAfee Endpoint protection? 

[anyWARE-Mainz]

@LiquidTension I will have a look into it.

@alexl010 Yes we do. Did you find the source and a solution for it?

[anyWARE-Mainz]

@LiquidTension 
No such file. Just a folder "*AppData\Local\Temp\mwbE39D.tmp" with a lot of files inside.

[HangingWithDan]

Please look into this. I just had the same issue last night. Here is the log:

"Malwarebytes
www.malwarebytes.com

-Log Details-
Protection Event Date: 7/6/20
Protection Event Time: 1:58 AM
Log File: c31482ca-bf4d-11ea-b297-ace2d34b2fcc.json

-Software Information-
Version: 4.1.0.56
Components Version: 1.0.955
Update Package Version: 1.0.26449
License: Premium

-System Information-
OS: Windows 10 (Build 18362.900)
CPU: x64
File System: NTFS
User: System

-Ransomware Details-
File: 1
Malware.Ransom.Agent.Generic, C:\Program Files (x86)\Microsoft Office\Office12\WINWORD.EXE, Blocked, 0, 392685, 0.0.0

(end)"

I know it's not malware because I have a tight firewall & its a legit program I use every day. I also have Bitdefender running with Malwarebytes.

 

To fix this issue, I had to restart my computer 2-3 times and repair Microsoft word using Microsoft's repair function within the installer. Please look into this guys!  Much Appreciated!

[exile360]

Greetings,

I'm sorry you've experienced this issue.  Please refer to this topic for the latest information on this issue.

Thanks

[anyWARE-Mainz]

Well, but how to obtain "beta-updates" via OneView or Nebula console?
As HangingWithDan wrote: Same issue we had on 3 different computers, word and excel, on different days.

 

Regards,
Daniel

[exile360]

Unfortunately, the beta only applies to the consumer version, however until the issue is resolved you should be able to either create exclusions or disable the shields for MS Office until the issue has been resolved by the Developers.  As I said, the aforementioned link has the latest information on this issue, and the fact that they have a beta which addresses this issue means a publicly available fix shouldn't be too far behind assuming testing of the beta goes well.