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03.12.2008 at 12:28PM PDT, ID: 23236396
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6.0

Suspicious outgoing network traffic

Asked by pascal_p in Networking Security Vulnerabilities, Windows NT Networking, Network Software Firewalls

Hi,
I am net admin in a relatively small site (30 nodes). Our company has 5 sites, 4 of them interconnected with VPNs, my site is amongst them. I have access to a web app that provides network traffic info and stats. I was checking it out and noticed February 2008 total traffic (donwload nad upload) was double the monthly regular total. I noticed the following:
14 gigs of steady outgoing traffic from friday Feb 22nd at 17:00 to Monday 25th at 08:00. That's 514 kbits/sec of outgoing traffic steady for 63 hours. I can tell the steady part from the graph I get from the data. Also, we're on DSL, so max of 800 Kbits upload (in theory).
No data seems to be missing.
No one has admin rights on machines.

I woukld just like to get ideas as to where I should investigate. So far, I have:
- called ISP to have logs of router. No logs there since router was rebooted 2 days ago.
- checked domain controller and workstation logs for that period.
- checked firewall logs for that period on all connected sites.
- run scans on all machines (have NOD32).

Thanks for your suggestions.
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About this solution

Zones: Networking Security Vulnerabilities, Windows NT Networking, Network Software Firewalls
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Solution Provided By: clearacid
Participating Experts: 3
Solution Grade: B
 
 
 
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