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: admin password server test user pass letmein 1234qwer 1q2w3e 1qaz2wsx aaa abc123 abcd1234 admin123 111 123 369 1111 12345 111111 123123 123321 123456 654321 666666 888888 1234567 12345678 123456789 1234567890
Once you are connected to a remote system, you can access the drives of that server via Windows shares such as \\tsclient\c and \\tsclient\d for drives C: and D:, respectively. Morto 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: