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rbecker
Level 9
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Message 1 of 13

Exploit Prevention silently blocking upgrade of Netskope client

We are running a pilot of Netskope on our infosec machines that are also running test versions of ENS 10.7.  During an upgrade of Netskope on 12/10/19 there was a failure of the upgrade.  The command line upgrade looks like this:

c:\windows\SysWOW64\msiexe.exe

c:\ProgramData\Netskope\STAgent\data\STAgent.msi.

MSI logs show the following:

- upgrade is reporting "files in use" specifically stAgentSvc

- this is possibly because taskkill.exe is failing to shutdown stAgentUI

- the roll-back stage of the MSI removes all of the files from c:\Program Files (x86)\Netskope\STAgent\ and .\win10

- it also attempts to remove the folder itself, but that failed

 

This does not happen if exploit prevention is disabled.  There are no McAfee event logs in threat prevention or exploit prevention that show this intervention but the upgrade works if exploit prevention is off.  

 

Is there any information that you could give or further digging we could do on our end that could solve this issue?

 

McAfee Endpoint Security 

 

 

12 Replies
rbecker
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Message 2 of 13

Re: Exploit Prevention silently blocking upgrade of Netskope client

Another update to this, see attached.  When attempting a fresh install of the Netskope client, the error logs regarding StopSTAgentUI/STAgentUI are attached.  The installer fails to stop the STAgentUI with exploit prevention on, but allows STAgentUI to stop and then registers components after exploit prevention is disabled, but there are no logs in McAfee despite logging set to all.netskope stagentui.JPGFailure when exploit prevention is enabled.netskope success.JPGinstaller actions once exploit prevention is disabled, writing component registrations.

McAfee Endpoint Security 

rbecker
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Message 3 of 13

Re: Exploit Prevention silently blocking upgrade of Netskope client

Also this, an error that cannot write a registry key due to exploit prevention being on.registry key access.JPG

Reliable Contributor jmcg
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Message 4 of 13

Re: Exploit Prevention silently blocking upgrade of Netskope client

Do you have any others Event regarding Exploit Prevention ?

 

What is your OS language ?

What is your ePO database language? 

rbecker
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Message 5 of 13

Re: Exploit Prevention silently blocking upgrade of Netskope client

English for both, no other exploit prevention events.

Reliable Contributor jmcg
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Message 6 of 13

Re: Exploit Prevention silently blocking upgrade of Netskope client

Ok, two possibility.

First, the log level is to high for some reason, check your settings on policy (Endpoint Platform -> Options)
McAfee Agent (Events)

Second, Product issue with your environnement, try to open a SR.
rbecker
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Message 7 of 13

Re: Exploit Prevention silently blocking upgrade of Netskope client

This is not helpful unfortunately.  We've already made a service request with the company and I have done this on several logging levels (critical and high only and all).  Could a McAfee representative chime in here for some support?

 

Thanks.

Reliable Contributor bodysoda
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Message 8 of 13

Re: Exploit Prevention silently blocking upgrade of Netskope client

Something you could try to check if the Netskope has code sign certificate which you could add to the exclusion on the EPO and try attempt the Netskope agent install. 

 

In case above information was useful or answered your question, please select "Accept as Solution" in my reply, or give a Kudo. Thanks!
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rbecker
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Message 9 of 13

Re: Exploit Prevention silently blocking upgrade of Netskope client

I'm more concerned with why this process is being blocked and not logged.  Excluding would fix the problem but doesn't get to the root cause.

Re: Exploit Prevention silently blocking upgrade of Netskope client

Can anyone from McAfee point me to someone who can describe more what is happening?  

 

Thanks

 

McAfee Endpoint Security 

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