Written in Microsoft Visual C++

more versions

dropped file:
c:\WINDOWS\system32\msrexe.exe
size: 30.720 bytes 

port: 7235, 6552, 5978 TCP

startup:
KEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Swartax "ImagePath"
data: C:\WINDOWS\System32\msrexe.exe 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Swartax "ImagePath"
data: C:\WINDOWS\System32\msrexe.exe 

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "System Service"
data: C:\WINDOWS\System32\msrexe.exe 

tested on Windows XP
November 28, 2004