[AusNOG] Possible New Zero Day Microsoft Windows 3389 vulnerability - outbound traffic 3389
Chris Macko
cmacko at intervolve.com.au
Sat Jan 14 00:28:19 EST 2012
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Hi James,
That's just RDP behaviour in responding to the request, best bet is to setup software or devices that block connections to diverse destination ips using the same port (the behaviour you're seeing is not only common with RDP but with SSH / MSSQL and a great deal of other protocols).
Kind Regards,
Chris Macko
Managing Director
Interhost Pacific Pty Ltd t/a Intervolve
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From: ausnog-bounces at lists.ausnog.net [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of James Braunegg
Sent: Friday, 13 January 2012 11:45 PM
To: Martin - StudioCoast; ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Possible New Zero Day Microsoft Windows 3389 vulnerability - outbound traffic 3389
Dear Martin
This could be a possibility, but the ratio of inbound traffic to outbound traffic was almost 1:20 (1 inbound to the server) 20 outbound to the server
Normally a brute force attack would be a large amount of inbound traffic, not outbound traffic from the server.
Kindest Regards
James Braunegg
W: 1300 769 972 | M: 0488 997 207 | D: (03) 9751 7616
E: james.braunegg at micron21.com<mailto:james.braunegg at micron21.com> | ABN: 12 109 977 666
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From: ausnog-bounces at lists.ausnog.net [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Martin - StudioCoast
Sent: Saturday, January 14, 2012 12:05 AM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Possible New Zero Day Microsoft Windows 3389 vulnerability - outbound traffic 3389
Looks like standard RDP brute force traffic to me. See it all the time on servers with open rdp ports.
Most likely 58.162.67.45 is attempting to login to all of those servers at once.
If a worm was able to get in, you would probably see a lot of inverse traffic as the worm would begin to brute force other IP addresses it finds.
On 13/01/2012 10:37 PM, James Braunegg wrote:
Hey All,
Just posting to see if anyone has seen any strange outbound traffic on port 3389 from Microsoft Windows Server over the last few hours.
We witnessed an alarming amount of completely independent Microsoft Windows Servers, each on separate vlan and subnets (ie all /30 and /29 allocations) with separate gateways on and completely separate customers, but all services were within the same 1.x.x.x/16 allocation all simultaneously send around 2mbit or so data to a specific target IP address.
The only common link was / is terminal services port 3389 is open to the public. Obviously someone (Mr 133t dude) scanned an allocation within our network, and like a worm was able to simultaneously control every Microsoft Windows Server to send outbound traffic.
Microsoft Windows Servers within the 1.x.x.x/16 allocation which were behind a firewall or VPN and did not have public 3389 access did not send the unknown traffic
Would be very interested if anyone else has seen this behavior before ! Or is this the start of a lovely new Zero Day Vulnerability with Windows RDP, if so I name it "ohDeer-RDP"
A sample of the traffic is as per below, collected from netflow
Source Destination Application Src Port Dst
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 51534 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 52699 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 60824 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 51669 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 49215 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 62099 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 65429 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 51965 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 50381 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 59379 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 58103 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 59514 TCP
x.x.x.x/16 58.162.67.45 ms-wbt-server 3389 58298 TCP
This occurred around 10:30pm AEST Friday the 13th of January 2012
We had many other Microsoft Windows Servers in other 2.x.x.x/16 IP ranges which were totally unaffected.
Kindest Regards
James Braunegg
W: 1300 769 972 | M: 0488 997 207 | D: (03) 9751 7616
E: james.braunegg at micron21.com<mailto:james.braunegg at micron21.com> | ABN: 12 109 977 666
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