Submission Summary:

• Submission details:
• Submission received: 25 May 2012, 03:36:52
• Processing time: 11 min 7 sec
• Submitted sample:
• File MD5: 0x816D3C53069962D2039440C885BC670F
• File SHA-1: 0x1AACB46A5F25A9FC9DE8625770EF3AF83257C38F
• Filesize: 158,720 bytes
• Alias:
• Trojan.Zeroaccess!gen7 [Symantec]
• Backdoor.Win32.ZAccess [Ikarus]

• Summary of the findings:

What's been found	Severity Level
Contains characteristics of an identified security risk.

Technical Details:

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:

• Notes:
• %AppData% is a variable that refers to the file system directory that serves as a common repository for application-specific data. A typical path is C:\Documents and Settings\[UserName]\Application Data.
• %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

• The following directories were created:
• %AppData%\{cbf70787-72f9-b6ef-7e3c-8c19ccb74892}
• %AppData%\{cbf70787-72f9-b6ef-7e3c-8c19ccb74892}\L
• %AppData%\{cbf70787-72f9-b6ef-7e3c-8c19ccb74892}\U
• %Windir%\Installer\{cbf70787-72f9-b6ef-7e3c-8c19ccb74892}
• %Windir%\Installer\{cbf70787-72f9-b6ef-7e3c-8c19ccb74892}\L
• %Windir%\Installer\{cbf70787-72f9-b6ef-7e3c-8c19ccb74892}\U

Memory Modifications

• There was a new process created in the system:

• The following modules were loaded into the address space of other process(es):

Module Name	Module Filename	Address Space Details
n	%System%\n	Process name: services.exe Process filename: %System%\services.exe Address space: 0x45670000 - 0x4567F000
n	%System%\n	Process name: explorer.exe Process filename: %Windir%\explorer.exe Address space: 0x45670000 - 0x4567F000

• Notes:
• %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).

• The following system service was modified:

Service Name	Display Name	New Status	Service Filename
ALG	Application Layer Gateway Service	"Stopped"	%System%\alg.exe

Registry Modifications

• The following Registry Keys were created:
• HKEY_CURRENT_USER\Software\Classes\CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}
• HKEY_CURRENT_USER\Software\Classes\CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}\InprocServer32

• The newly created Registry Value is:
• [HKEY_CURRENT_USER\Software\Classes\CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}\InprocServer32]
• ThreadingModel = "Both"
• (Default) = "%AppData%\{cbf70787-72f9-b6ef-7e3c-8c19ccb74892}\n."

• The following Registry Value was modified:
• [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F3130CDB-AA52-4C3A-AB32-85FFC23AF9C1}\InprocServer32]
• (Default) =