ThreatExpert Report: W32.Koobface.A, Mal/Generic-A, Net-Worm.Win32.Koobface

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Submission Summary:

Submission details:

Submission received: 10 July 2009, 10:03:02
Processing time: 5 min 37 sec
Submitted sample:

File MD5: 0x976DBFA0D8D0614508BE4053B4153D45
File SHA-1: 0xB4E13AB30EA9B7C7964DD70F46228DE3E3A16136
Filesize: 15,872 bytes
Alias & packer info:

W32.Koobface.A [Symantec]
Mal/Generic-A [Sophos]
Net-Worm.Win32.Koobface [Ikarus]
packed with: PE_Patch.UPX [Kaspersky Lab]

Summary of the findings:

What's been found	Severity Level
Creates a startup registry entry.

Technical Details:

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Windir%\3456665.bat	171 bytes	MD5: 0x5D261718F387F164D0034386B8011F90 SHA-1: 0x11468460DC25EA7BDC171380D6ED20E4527B2515	(not available)
2	%Windir%\ld12.exe [file and pathname of the sample #1]	15,872 bytes	MD5: 0x976DBFA0D8D0614508BE4053B4153D45 SHA-1: 0xB4E13AB30EA9B7C7964DD70F46228DE3E3A16136	W32.Koobface.A [Symantec] Mal/Generic-A [Sophos] Net-Worm.Win32.Koobface [Ikarus] packed with PE_Patch.UPX [Kaspersky Lab]

Note:

%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
ld12.exe	%Windir%\ld12.exe	49,152 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	49,152 bytes

Registry Modifications

The following Registry Keys were deleted:

HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating
HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating\.Current
HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating\.Default

The newly created Registry Value is:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]

sysldtray = "%Windir%\ld12.exe"

so that ld12.exe runs every time Windows starts

The following Registry Values were deleted:

[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating\.Default]

(Default) = "%SystemRoot%\media\Windows XP Start.wav"

[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating\.Current]

(Default) = "%SystemRoot%\media\Windows XP Start.wav"

[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating]

(Default) = ""

Other details

To mark the presence in the system, the following Mutex object was created:

xx464dg433xx12

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