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Possible infection: A LOT of TCP connections


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Today I seen one laptop with Windows 7 in my house trying A LOT of TCP connections (like 6 attempts for second for about two minutes) to another devices on my network, including my router.

Some of the ports that it tried to connect: 21, 22 ,23, 69, 80, 139, 443, 445, 554, 1900, 2869, 5354, 5431, 7777, 8888, 9999, 12323, 57621, 59777, 60000...

Obviously, I guess it is some virus, since most of these ports is commonly explored by vulnerabilities, but I have noticed some things:

  1. That PC was not in use when this connections has started, just turned on.
  2. Avast tried to use AvastSvc.exe (which my firewall blocked as usually) just 3 seconds before this storm of TCP connections started (according to my firewall, it was not AvastSvc who tried those connections, but the Windows itself).
  3. That was a lot of ports, and I didn't include even the half amount. 
  4. This occurred before at another PC with Windows 10, but I don't remember if all those ports were attempted (I think not, but I also remember that only two devices were on at the time: this PC itself and another one), but I remember about attempts at least on ports 21, 23, 80, 443 and 445. I formatted that PC and, as far as know, it didn't happen again.

Those connection attempts were blocked by other PCs on the network because their firewalls, but I'm afraid about the other devices which doesn't have firewalls, like TV and smartphones.

I turned off the internet on that laptop and started Malwarebytes' scanning (but it will take hours). I'm also afraid that connect the laptop to the internet again (for download Farbar Recovery) will put my other devices in risk.

So, is it a virus that caused it? I never hear about a virus who attempts to all those ports. Or maybe all of this is a really strange behavior of Avast, maybe scanning the network? Help me please.
 

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  • Root Admin

Hello @ConcernedGuy

There is no need to run a Full scan with Malwarebytes. Please post back the actual Protection Log from Malwarebytes so that we can review it.

You can run a normal Threat scan which takes just a few minutes and it will locate and find any live threats on the system.

STOP the current scan and run the following. You may need to disable Avast temporarily.

Please run the following steps and post back the logs as an attachment when ready.

STEP 01

  • If you're already running Malwarebytes then open Malwarebytes and check for updates. Then click on the Scan tab and select Threat Scan and click on Start Scan button.
  • If you don't have Malwarebytes installed yet please download it from here and install it.
  • Once installed then open Malwarebytes and select Scan and let it run.
  • Once the scan is completed click on the View Report button, then the Export button and save the file as a Text file to your desktop or other location you can find and attach that log on your next reply.
  • If Malwarebytes won't run then please skip to the next step and let me know in your next reply.

STEP 02

Please download AdwCleaner by Malwarebytes and save the file to your Desktop.

  • Right-click on the program and select RunAsAdmin.jpg Run as Administrator to start the tool.
  • Accept the Terms of use.
  • Wait until the database is updated.
  • Click Scan Now.
  • When finished, please click Clean & Repair.
  • Your PC should reboot now if any items were found.
  • After reboot, a log file will be opened. Attach or Copy its content into your next reply.

 

RESTART THE COMPUTER Before running Step 3

STEP 03
Please download the Farbar Recovery Scan Tool and save it to your desktop.

Note: You need to run the version compatible with your system. You can check here if you're not sure if your computer is 32-bit or 64-bit

  • Double-click to run it. When the tool opens, click Yes to disclaimer.
  • Press the Scan button.
  • It will make a log (FRST.txt) in the same directory the tool is run. Please attach it to your reply.
  • The first time the tool is run, it also makes another log (Addition.txt). If you've, run the tool before you need to place a checkmark here.
  • Please attach the Additions.txt log to your reply as well.

 

Thanks

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Thank you a lot for the quickly answer. I did a normal scan on Malwarebytes as you said and it didn't detect anything.

However, about Adwcleaner and Farbar, should I wait until I can turn off all devices in my house to connect the possible infected laptop to the internet? I'm afraid that it could infect other devices.

 

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Sorry for my delay. I talked with my mom (laptop's owner) and she said this laptop was formatted more than five years ago. So, I think it is a good time to do it.

However,  I'm really grateful for your dedication helping other people. If I have another problem in the future, I will come back here.

Thank you again 😄

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  • Root Admin

Glad we could help.

If you need this topic reopened, please send a Private Message to any one of the moderating team members. Please include a link to this topic with your request.

This applies only to the originator of this thread. Other members who need assistance please start your own topic in a new thread.

Please review the following for Tips to help protect from infection

Thank you

 

 

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