Submission Summary:

• Submission details:
• Submission received: 25 November 2009, 15:47:06
• Processing time: 6 min 13 sec
• Submitted sample:
• File MD5: 0x00A038FD110D97CEF2C275319FA3A03A
• File SHA-1: 0x4B9945B19A239165881BDD566A900E42963DC97B
• Filesize: 24,336 bytes
• Alias:
• Trojan.Generic [PCTools]
• Trojan Horse [Symantec]
• Trojan.Win32.Vilsel.nge [Kaspersky Lab]
• TrojanDownloader:Win32/Fakeinit [Microsoft]

• Summary of the findings:

What's been found	Severity Level
Modifies some system settings that may have negative impact on overall system security state.
Creates a startup registry entry.
Contains characteristics of an identified security risk.

Technical Details:

• The new window was created, as shown below:

Possible Security Risk

• Attention! The following threat category was identified:

Threat Category	Description
	A malicious trojan horse or bot that may represent security risk for the compromised system and/or its network environment

File System Modifications

• The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	c:\s	1 bytes	MD5: 0xC4CA4238A0B923820DCC509A6F75849B SHA-1: 0x356A192B7913B04C54574D18C28D46E6395428AB	(not available)
2	[file and pathname of the sample #1] %System%\winupdate86.exe	24,336 bytes	MD5: 0x00A038FD110D97CEF2C275319FA3A03A SHA-1: 0x4B9945B19A239165881BDD566A900E42963DC97B	Trojan.Generic [PCTools] Trojan Horse [Symantec] Trojan.Win32.Vilsel.nge [Kaspersky Lab] TrojanDownloader:Win32/Fakeinit [Microsoft]

• Note:
• %System% is a variable that refers to the System folder. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

Memory Modifications

• There were new processes created in the system:

Registry Modifications

• The following Registry Keys were created:
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\ActiveDesktop
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

• The newly created Registry Values are:
• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\ActiveDesktop]
• NoChangingWallpaper = 0x00000001
• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer]
• NoSetActiveDesktop = 0x00000001
• NoActiveDesktopChanges = 0x00000001
• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
• winupdate86.exe = "%System%\winupdate86.exe"

so that s runs every time Windows starts

• [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
• NoSetActiveDesktop = 0x00000001
• NoActiveDesktopChanges = 0x00000001
• [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop]
• NoChangingWallpaper = 0x00000001
• [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]
• DisableTaskMgr = 0x00000001

to prevent users from starting Task Manager (Taskmgr.exe)