I have PA-820 with fully updated signatures, I have blocked Teamviewer via security policy. PA is recognising the application and traffic log showing that teamviewer connection is blocked but on host machine teamviewer is running and outbound / inbound teamviewer connections are sucessful. I have also tried by applying ssl decryption but still same result. Need help in this regard.
Out of curiosity are you blocking all of the app-ids? You would either include the app-id container of 'teamviewer' and then 'teamviewer-web' or you would need to list out all 4 individually. Generally in my experience the firewall is rather good at identifying teamviewer traffic and blocking it when you are decrypting traffic.
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We do not use any form of SSL decryption on our PA, but we are still able to effectively block Teamviewer. Does the firewall perhaps do some kind of hostname/FQDN match in addition to block the traffic? I see in the traffic logs that Teamviewer first tries port tcp/5938, then tcp/443 then tcp/80, but all the sessions are blocked with app-id teamviewer-base.
The firewall is capable of still identifying certain applications through a number of different ways that aren't encrypted when you are using SSL. Under the majority of use cases the firewall is perfectly capable of identifying teamviewer traffic without decrypting the traffic.
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Syscom AS
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  Original Message Original Message:
Sent: 05-03-2021 10:51 AM
From: Colin McRae
Subject: False positives with SEP and Teamviewer?
Yeah I've been annoyed by this issue for well over a month, maybe two months. I manage a lot of SES customers and most of them are seeing "attacks" on port 5938 almost every day (seen via IPS reports). So far Symantec has not acknowledged the issue in a separate post I had made a while ago, they're busy with other stuff I suppose. Judging by Teamviewer's general behavior over the years I've been using it, I don't think they have a very solid product design that's imperviious to compromise, so I would not be surprised to learn some day in the future that their product had been hacked or something, but having said that, there's currently no reason to think they're any real issue.
The problem lacks the regularity of a heartbeat, but happens often enough that I am very much confused by the pattern.
It's also not ok to just whitelist the exe file, that's lazy secops behavior and rules out real detections later. So on this one I would have to think Symantec needds to talk to TeamViewer and work this out, or just identify the false positive trigger and fix that if applicable.
Original Message:
Sent: 04-29-2021 01:59 PM
From: r m
Subject: False positives with SEP and Teamviewer?
I've got some machines with Teamviewer installed. I'm seeing a lot of outbound attacks in SEPM logs for network attack on some machines that have Teamviewer, and different versions of Teamviewer. It looks like Symantec is calling teamviewer_service.exe an outbound attack. I'm thinking it's some kind of heart beat/checkin thing that Teamviewer is doing, that machine reporting itself in with Teamviewer.
Is anyone seeing that? That is a false positive, correct? It's pretty consistent on machines with Teamviewer. I don't believe they all got compromised, and there are no other signs. My network attacks alerts started blowing up yesterday morning.
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rmo
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Syscom AS
Original Message:
Sent: 05-03-2021 10:51 AM
From: Colin McRae
Subject: False positives with SEP and Teamviewer?
Yeah I've been annoyed by this issue for well over a month, maybe two months. I manage a lot of SES customers and most of them are seeing "attacks" on port 5938 almost every day (seen via IPS reports). So far Symantec has not acknowledged the issue in a separate post I had made a while ago, they're busy with other stuff I suppose. Judging by Teamviewer's general behavior over the years I've been using it, I don't think they have a very solid product design that's imperviious to compromise, so I would not be surprised to learn some day in the future that their product had been hacked or something, but having said that, there's currently no reason to think they're any real issue.
The problem lacks the regularity of a heartbeat, but happens often enough that I am very much confused by the pattern.
It's also not ok to just whitelist the exe file, that's lazy secops behavior and rules out real detections later. So on this one I would have to think Symantec needds to talk to TeamViewer and work this out, or just identify the false positive trigger and fix that if applicable.
Original Message:
Sent: 04-29-2021 01:59 PM
From: r m
Subject: False positives with SEP and Teamviewer?
I've got some machines with Teamviewer installed. I'm seeing a lot of outbound attacks in SEPM logs for network attack on some machines that have Teamviewer, and different versions of Teamviewer. It looks like Symantec is calling teamviewer_service.exe an outbound attack. I'm thinking it's some kind of heart beat/checkin thing that Teamviewer is doing, that machine reporting itself in with Teamviewer.
Is anyone seeing that? That is a false positive, correct? It's pretty consistent on machines with Teamviewer. I don't believe they all got compromised, and there are no other signs. My network attacks alerts started blowing up yesterday morning.
------------------------------
rmo
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I don't know if this means that all traffic goes via the teamviewer servers, but it might. (And as it registers all clicks and keypresses, that probably means that they could - in theory - and since we know about PRISM etc probably in reality as well - know about all your logins and secret keys.)
It does not show in the Startup Applications so I am guessing it is either hidden in the Startup applications or it is loaded by an option in a configuration file. I want to remove this automatic way of loading into memory so that it only works when I actually use teamviewer and not every time I boot the computer.
I've had this problem just now, and solved it by changing the option "[int32] Always_Online" to "0" in the file /etc/teamviewer/global.conf. Basically, what you should is to access this file with sudo privileges, and change this line:
I have installed Teamviewer QS in our Citrix envoritment. I launch it, then i can see id and password. If i try to connect to Virtual Desktop through teamviewer from a local client, it try very fast and then close connection. I do not get any help in the event viewer on server/local client.
I'm making a program which logs user activity, and I'd like to be able to get a Teamviewer ID and send it to a log, I know how to send the information to the log by assigning that information to a variable, however I'm not sure how to pass a teamviewer ID to said variable and would like some help on this.
You may already have teamviewer running on your computer if you are using Windows 7, most staff computers have it installed. You can check your ID number by opening the teamviewer program if it's already running. To check, click on the up arrow in the bottom right hand corner of your screen. Look for the teamviewer icon depicted in the picture below in the blue circle. Click on the small icon and you should see the teamviewer window appear. 0852c4b9a8
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