[AusNOG] Possible New Zero Day Microsoft Windows 3389 vulnerability - outbound traffic 3389

James Braunegg james.braunegg at micron21.com
Sat Jan 14 01:19:22 EST 2012


Dear Chris and Martin

I tend to agree with you, as a remote desktop connection attempt does send a bit of outbound traffic, that being said iv looked in some of the logs on a few servers (don't have access to most) and cannot find any large amount of login attempts...  The search for the needle in the hay stack continues.

Kindest Regards

James Braunegg
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E:   james.braunegg at micron21.com<mailto:james.braunegg at micron21.com>  |  ABN:  12 109 977 666

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From: Chris Macko [mailto:cmacko at intervolve.com.au]
Sent: Saturday, January 14, 2012 12:28 AM
To: James Braunegg; Martin - StudioCoast; ausnog at lists.ausnog.net
Subject: RE: [AusNOG] Possible New Zero Day Microsoft Windows 3389 vulnerability - outbound traffic 3389





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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).

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Chris Macko
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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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This message is intended for the addressee named above. It may contain privileged or confidential information. If you are not the intended recipient of this message you must not use, copy, distribute or disclose it to anyone other than the addressee. If you have received this message in error please return the message to the sender by replying to it and then delete the message from your computer.

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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