This malicious program is a Trojan. It is a Windows PE EXE file. It is 417792 bytes in size. It is packed using UPX. The unpacked file is approximately 439KB in size. It is written in C++.
Installation
Once launched, the Trojan copies its body to the current user’s Windows startup directory:
%Documents and Settings%\<user_name>\Main Menu\Programs\Startup\uninstall.exe
Payload
Once the victim machine has been rebooted, the Trojan extracts a file from itself. The file will have one of the names shown below:
%Documents and Settings%\<user_name>\Application Data\svchosts.exe
%Documents and Settings%\<user_name>\Application Data\taskmon.exe
%Documents and Settings%\<user_name>\Application Data\rundll.exe
%Documents and Settings%\<user_name>\Application Data\service.exe
%Documents and Settings%\<user_name>\Application Data\sound.exe
%Documents and Settings%\<user_name>\Application Data\upnpsvc.exe
%Documents and Settings%\<user_name>\Application Data\lsas.exe
%Documents and Settings%\<user_name>\Application Data\logon.exe
%Documents and Settings%\<user_name>\Application Data\helper.exe
%Documents and Settings%\<user_name>\Application Data\event.exe
%Documents and Settings%\<user_name>\Application Data\dumpreport.exe
%Documents and Settings%\<user_name>\Application Data\msiexeca.exe
This file is 404992 bytes in size. It will be detected by Anti-Virus as Trojan-Downloader.Win32.Agent.aoth.
In order to ensure that the Trojan is launched automatically each time the system is rebooted, the Trojan places a link to the file it extracted from its body in the system registry:
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"<rnd1>" = "<rnd2>"
<rnd1> is a name chosen from the list below:
CrashDump
EventLog
Init
lsass
Regscan
RunDll
Setup
Sound
svchosts
System
TaskMon
UPNP
Windows
<rnd> is the path to the file extracted from the Trojan shown in the list above.
Once the Trojan had delivered its payload, it will delete both its body and its copy "%Documents and Settings%\\Main Menu\Programs\Startup\uninstall.exe".
This Trojan will not run on Russian versions of Windows.
