We don't see that many internet worms these days. It's mostly just bots and trojans. But we just found a new internet worm, and it's spreading in the wild.
The worm is called Morto and it infects Windows workstations and servers. It uses a new spreading vector that we haven't seen before: RDP.
RDP stands for Remote Desktop Protocol. Windows has built-in support for this protocol via Windows Remote Desktop Connection. Once you enable a computer for remote use, you can use any other computer to access it.
When you connect to another computer with this tool, you can remotely use the computer, just like you'd use a local computer.
Once a machine gets infected, the Morto worm starts scanning the local network for machines that have Remote Desktop Connection enabled. This creates a lot of traffic for port 3389/TCP, which is the RDP port.
When Morto finds a Remote Desktop server, it tries logging in as Administrator and tries a series of passwords:
Once you are connected to a remote system, you can access the drives of that server via Windows shares like \\tsclient\c and\\tsclient\d for drives C: and D:, respectively. Monto uses this feature to copy itself to the target machine. It does this by creating a temporary drive under letter A: and copying a file called a.dll to it.
The infection will create several new files on the system including \windows\system32\sens32.dll and
\windows\offline web pages\cache.txt
Morto can be controlled remotely. This is done via several alternative servers, including jaifr.com and qfsl.net
We've seen several different samples. Some MD5 hashes include:
More discussion on the topic at Technet forums.
We detect Morto components as Backdoor:W32/Morto.A and Worm:W32/Morto.B