Submission Summary:

• Submission details:
• Submission received: 12 December 2009, 19:32:17
• Processing time: 8 min 24 sec
• Submitted sample:
• File MD5: 0xEFFCB69928EC344E7BE4A30D686F184A
• File SHA-1: 0x343E05EF7F83FE337590DFEC1F62E8DCC591F5B7
• Filesize: 21,504 bytes
• Alias:
• W32.Koobface.D [Symantec]
• Net-Worm.Win32.Koobface.brr [Kaspersky Lab]

• Summary of the findings:

What's been found	Severity Level
Downloads/requests other files from Internet.
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 network-aware worm that attempts to replicate across the existing network(s)

File System Modifications

• The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%ProgramFiles%\captcha.bat	192 bytes	MD5: 0x02328EACED5B9B50EDBAFAD95902154C SHA-1: 0xCE31D8E8067384D0DB4DE71EE1242B0B2707C6A7	W32/Koobface.worm.gen.h!bat [McAfee]
2	%ProgramFiles%\captcha.dll	17,408 bytes	MD5: 0x8EC54E4E8BE2D36067077BAEFBEA2ED3 SHA-1: 0xEFCA66ABEB9A559EF6A7E0A01BDE3D37D6AB1ED9	Net-Worm.Win32.Koobface.csy [Kaspersky Lab] Troj/Capper-Gen [Sophos] packed with PE_Patch.UPX [Kaspersky Lab]
3	[file and pathname of the sample #1]	21,504 bytes	MD5: 0xEFFCB69928EC344E7BE4A30D686F184A SHA-1: 0x343E05EF7F83FE337590DFEC1F62E8DCC591F5B7	W32.Koobface.D [Symantec] Net-Worm.Win32.Koobface.brr [Kaspersky Lab]

• Note:
• %ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.

Memory Modifications

• The following module was loaded into the address space of other process(es):

Module Name	Module Filename	Address Space Details
captcha.dll	%ProgramFiles%\captcha.dll	Process name: [generic host process] Process filename: [generic host process filename] Address space: 0x10000000 - 0x1000F000

• Notes:
• [generic host process filename] is a full path filename of [generic host process].

Registry Modifications

• The newly created Registry Value is:
• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
• Captcha7 = "rundll "%ProgramFiles%\captcha.dll",captcha"

so that captcha.dll runs every time Windows starts

Other details

• There was registered attempt to establish connection with the remote host. The connection details are:

• The data identified by the following URL was then requested from the remote web server:
• http://uuu20091124.info/captcha/?a=get&i=1&v=16