ThreatExpert Report: W32/Koobfa-Gen

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Submission Summary:

Submission details:

Submission received: 27 May 2009, 17:53:14
Processing time: 5 min 26 sec
Submitted sample:

File MD5: 0xE8A03879D114DBAF7F796ED33E31D4A4
File SHA-1: 0x4AAC0418B2436FEC414F18FB382D2D353CFA8D2A
Filesize: 14,848 bytes
Alias & packer info:

W32/Koobfa-Gen [Sophos]
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	c:\487656.bat	160 bytes	MD5: 0x4EB53673C57BCEDEACD955FE95522256 SHA-1: 0x83CC0C497F5EA7C0567B538ABD8A310178E9178E	(not available)
2	%Windir%\ld08.exe [file and pathname of the sample #1]	14,848 bytes	MD5: 0xE8A03879D114DBAF7F796ED33E31D4A4 SHA-1: 0x4AAC0418B2436FEC414F18FB382D2D353CFA8D2A	W32/Koobfa-Gen [Sophos] 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
ld08.exe	%Windir%\ld08.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%\ld08.exe"

so that ld08.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:

1r35345r456g6308

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