ThreatExpert Report: Net-Worm.Koobface, Net-Worm.Win32.Koobface.ck, W32.Koobface.B, W32/Koobfa-Gen..

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Submission Summary:

Submission details:

Submission received: 6 March 2009, 13:35:58
Processing time: 6 min 41 sec
Submitted sample:

File MD5: 0xA3A42ED2F682E1507B65808969A789A6
File SHA-1: 0xA006CAA04C6B6299D8AD98E724380BA719075F72
Filesize: 27,136 bytes
Alias & packer info:

Net-Worm.Koobface [PCTools]
W32.Koobface.B [Symantec]
Net-Worm.Win32.Koobface.ck [Kaspersky Lab]
W32/Koobfa-Gen [Sophos]
Net-Worm.Win32.Koobface [Ikarus]
Win-Trojan/Agent.73728.LD [AhnLab]
packed with: PE_Patch.UPX [Kaspersky Lab]

Summary of the findings:

What's been found	Severity Level
Contains characteristics of Koobface, a worm that spreads through social networking sites.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! Characteristics of the following security risk was identified in the system:

Security Risk	Description
Net-Worm.Koobface	Net-Worm.Koobface is a network-aware worm that attempts to replicate across the existing network(s) and also can be used to hijack certain aspects of users' web browser functionality (such as homepage, search page, and security settings).

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	%Windir%\bolivar28.exe	27,136 bytes	MD5: 0xA3A42ED2F682E1507B65808969A789A6 SHA-1: 0xA006CAA04C6B6299D8AD98E724380BA719075F72	Net-Worm.Koobface [PCTools] W32.Koobface.B [Symantec] Net-Worm.Win32.Koobface.ck [Kaspersky Lab] W32/Koobfa-Gen [Sophos] Net-Worm.Win32.Koobface [Ikarus] Win-Trojan/Agent.73728.LD [AhnLab] packed with PE_Patch.UPX [Kaspersky Lab]
2	%Windir%\fmark2.dat	1 bytes	MD5: 0xC4CA4238A0B923820DCC509A6F75849B SHA-1: 0x356A192B7913B04C54574D18C28D46E6395428AB	(not available)

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
bolivar28.exe	%Windir%\bolivar28.exe	90,112 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	90,112 bytes

Other details

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

4334ffghfghfgh45y54f5

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