Migmaf

This trojan does not include any kind of propagation mechanism so, its arrival into a machine as to be caused by accompanying components or by manually breaking into the system.

It performs a check on the Windows version, it will only run in Windows 98/ME and newer versions like Windows NT, Windows 2000, Windows XP, or Windows Server 2003 family, exiting if it finds any other version (Windows 95).

It creates a mutex in the system with name "REQUEST_MANAGE_SUBSYSTEM" so it will only be one instance of it running at a given time.

next, it will perform a check for the keyboard layout from the registry value:

[HKEY_CURRENT_USER\Keyboard Layout\Preload]

It will check up to three values set in this registry entry and, if any of them matches the code of the Russian keyboard layout it will exit.

next, this malware will add an entry in:

[HKEY_CURRENT_USER\Software\Microsoft\Windows\Currentversion\Run] "Login Service" = %path_to_file%

%path_to_file% signifies the path to the current running instance of this malware.

After this initial steps, it will perform a speed test against www.microsoft.com. This tests will include the text

"disclaimer: www.microsoft.com used for bandwidth speed testing only"

Once finished with this tests it will contact to a hard-coded master server, of which it will attempt to hide its address by not always correctly connecting to it (it will try fake addresses).

Hosts connecting to the infected computer will be relayed to the master which will remain hidden from the connecting hosts.

Blocking ports 80 and 81 on the users' machine will prevent it from being used by this malware. This can be accomplished with Firewall software.