Solved

Strange Looking Packet Capture

Posted on 2014-01-22
3
271 Views
Last Modified: 2014-03-20
Below are screenshots from a packet capture from Wire Shark.  We have two managed switches that are currently set to shutdown any suspected port of a DOS attack.  We have witnessed the switch shutting down the WAN port numerous times.  If we disable the DOS port check in the switches than eventually our ISP will shutdown our internet service.  

We began by blaming malware for this and have done numerous scans of every desktop with multiple products and have found no infections.

The UDP packets that are outbound have check sum errors and the Inbound UDP packets are fine.

Any ideas?
DesktopL.png
DesktopB.png
0
Comment
Question by:MPATechTeam
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 83

Accepted Solution

by:
Dave Baldwin earned 250 total points
ID: 39801971
Doesn't the local IP address tell you which machine they are coming from?  Have you tried TCPView http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx and/or Process Explorer http://technet.microsoft.com/en-us/sysinternals/bb896653 to identify the program that is doing this?

It is the goal of the malware and virus writers to create a program that is not identified as a virus or malware.  Anti-virus and anti-malware authors are always playing catch-up to identify and eliminate the new programs.
0
 
LVL 16

Assisted Solution

by:gurutc
gurutc earned 250 total points
ID: 39803146
Also, if you don't have too many local PCs you can try shutting them down one at a time to see if that stops the flood.

- gurutc
0
 

Author Closing Comment

by:MPATechTeam
ID: 39942686
These were helpful in tracking down the trouble.
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Any tablets immune to viruses? 11 118
Norton antivirus 11 95
Do I need additional protection from ransomware? 13 157
Ransomware 9 101
To Remove Security Suite for Windows Malware from a Windows XP Machine:  Restart computer in Safe Mode (to do this see http://tinyurl.com/me78p) Login as Administrator Go to My Computer /Tools/ Folder Options/ View/  check mark the selectio…
It started not too long ago. It was at first annoying. My keystrokes seemed to be randomly generated, not the ones I typed on the keyboard. For some reason this only happened in certain applications (especially browsers such as IE11, Firefox and Chr…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question