ThreatExpert Report: Net-Worm.Koobface, Trojan-Downloader.Win32.Agent.atbf, W32.Koobface.B..

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Submission Summary:

Submission details:

Submission received: 25 April 2009, 15:15:47
Processing time: 5 min 14 sec
Submitted sample:

File MD5: 0x3071F71FC14BA590CA73801E19E8F66D
File SHA-1: 0x2F80A5B2575C788DE1D94ED1E8005003F1CA004D
Filesize: 27,136 bytes
Alias & packer info:

Net-Worm.Koobface [PCTools]
W32.Koobface.B [Symantec]
Trojan-Downloader.Win32.Agent.atbf [Kaspersky Lab]
W32/Koobfa-Gen [Sophos]
Trojan-Dropper.Agent [Ikarus]
Win32/Koobface.worm.27136 [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:

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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 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%\bolivar28.exe	27,136 bytes	MD5: 0x3071F71FC14BA590CA73801E19E8F66D SHA-1: 0x2F80A5B2575C788DE1D94ED1E8005003F1CA004D	Net-Worm.Koobface [PCTools] W32.Koobface.B [Symantec] Trojan-Downloader.Win32.Agent.atbf [Kaspersky Lab] W32/Koobfa-Gen [Sophos] Trojan-Dropper.Agent [Ikarus] Win32/Koobface.worm.27136 [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	86,016 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	86,016 bytes

Other details

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

4334ffghfghfgh45y54f5

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