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

[Marcus Emanuel]

Hi James,

Heres a likely scenario.

When being targeted by a brute force RDP attack, each login attempt hitting each box discovered on your networks sends the bitmap as it paints the RDP login screen on the attackers system. If each login screen sends 20Kb of data, then it's likely that around 100 simultaneous rdp login attempt sessions were in progress per second.

You will probably have seen a high count of winlogon.exe on the targeted boxes too.

Cheers,
Marcus


On 13/01/2012, at 11:52 PM, "James Braunegg" <james.braunegg at micron21.com> 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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