Written in Microsoft Visual C++

more versions

Backdoor.Sinit.e:
dropped file:
c:\WINDOWS\system32\svcinit.exe
size: 139.264 bytes 
 
port: 53 TCP & UDP

startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon "Userinit"
old data: C:\WINDOWS\system32\userinit.exe, 
new data: C:\WINDOWS\System32\userinit.exe,C:\WINDOWS\System32\svcinit.exe 

tested on Windows XP