ThreatExpert Report: Trojan-Downloader.Win32.Injecter.ddn, W32.Koobface.A

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Submission Summary:

Submission details:

Submission received: 9 July 2009, 09:35:32
Processing time: 5 min 33 sec
Submitted sample:

File MD5: 0x5C8C37B5CE36B12AAA670B30BD84887A
File SHA-1: 0xA4FA0FA20BF53D9780EB4F58053743F84AF9F86C
Filesize: 17,920 bytes
Alias & packer info:

W32.Koobface.A [Symantec]
Trojan-Downloader.Win32.Injecter.ddn [Kaspersky Lab]
packed with: PE_Patch.UPX [Kaspersky Lab]

Summary of the findings:

What's been found	Severity Level
Creates a startup registry entry.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! The following threat category was identified:

Threat Category	Description
	A program that downloads files to the local computer that may represent security risk

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Windir%\567788.bat	170 bytes	MD5: 0xD4C7708C4B55AC6A3FF4028ECA3A32D7 SHA-1: 0x4DF0699FA0FC22506B2853AAF69E2E370B3C587C	(not available)
2	%Windir%\ld12.exe [file and pathname of the sample #1]	17,920 bytes	MD5: 0x5C8C37B5CE36B12AAA670B30BD84887A SHA-1: 0xA4FA0FA20BF53D9780EB4F58053743F84AF9F86C	W32.Koobface.A [Symantec] Trojan-Downloader.Win32.Injecter.ddn [Kaspersky Lab] 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	57,344 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	57,344 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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