ThreatExpert Report: W32/Koobfa-Gen, not-a-virus:AdWare.Win32.BHO

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Submission Summary:

Submission details:

Submission received: 10 December 2008, 15:01:44
Processing time: 6 min 52 sec
Submitted sample:

File MD5: 0xFBBED6D47AFA77B21BCCE76625BE8559
File SHA-1: 0x686504B2C53D95FC64B65623A1CA3986E8DA6F70
Filesize: 34,304 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
Contains characteristics of Koobface, a worm that spreads through social networking sites.
Contains characteristics of an identified security risk.

Technical Details:

The new window was created, as shown below:

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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).

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Temp%\tt_1224467180.exe	14,336 bytes	MD5: 0x7CE8D0A9D3FC6B6CEB03296DF1F6E265 SHA-1: 0xB28C97C3AFDAEC388E6EF769B33667012AA981B9	packed with PE_Patch.UPX [Kaspersky Lab]
2	%ProgramFiles%\tinyproxy\tinyproxy.exe	8,960 bytes	MD5: 0x4704AE1836A5F2B6275C80FAA504D940 SHA-1: 0x4CA16E12EC45950478991012D0B7B044BADA3B2E	not-a-virus:AdWare.Win32.BHO [Ikarus] packed with PE_Patch.PECompact [Kaspersky Lab]
3	c:\tinyproxy.bat	275 bytes	MD5: 0xC6105F914136EAB987877BF156422FB1 SHA-1: 0x181A8CFA663562CFE9567806385A73354BD7FB6B	(not available)
4	%Windir%\bolivar29.exe	34,304 bytes	MD5: 0xFBBED6D47AFA77B21BCCE76625BE8559 SHA-1: 0x686504B2C53D95FC64B65623A1CA3986E8DA6F70	W32/Koobfa-Gen [Sophos] packed with PE_Patch.UPX [Kaspersky Lab]
5	%Windir%\fmark2.dat	1 bytes	MD5: 0xC4CA4238A0B923820DCC509A6F75849B SHA-1: 0x356A192B7913B04C54574D18C28D46E6395428AB	(not available)

Notes:

%Temp% is a variable that refers to the temporary folder in the short path form. By default, this is C:\Documents and Settings\[UserName]\Local Settings\Temp\ (Windows NT/2000/XP).
%ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.
%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

The following directory was created:

%ProgramFiles%\tinyproxy

Memory Modifications

There was a new process created in the system:

Process Name	Process Filename	Main Module Size
bolivar29.exe	%Windir%\bolivar29.exe	102,400 bytes

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MIME\Database\Content Type\application/xhtml+xml
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Distributed Link Tracking Client (TrkWks)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Distributed Link Tracking Client (TrkWks) \Security

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 Values are:

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MIME\Database\Content Type\application/xhtml+xml]

CLSID = "{25336920-03F9-11cf-8FD0-00AA00686F13}"
Extension = ".xml"
Encoding = 08 00 00 00

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Distributed Link Tracking Client (TrkWks) \Security]

Security = 01 00 14 80 90 00 00 00 9C 00 00 00 14 00 00 00 30 00 00 00 02 00 1C 00 01 00 00 00 02 80 14 00 FF 01 0F 00 01 01 00 00 00 00 00 01 00 00 00 00 02 00 60 00 04 00 00 00 00 00 14 00 FD 01 02 00 01 01 00 00 00 00 00 05 12 00 00 00 00 00 18 00 FF 01 0F 0

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Distributed Link Tracking Client (TrkWks)]

Type = 0x00000010
Start = 0x00000002
ErrorControl = 0x00000000
ImagePath = "%ProgramFiles%\tinyproxy\tinyproxy.exe"
DisplayName = "Distributed Link Tracking Client (TrkWks) "
ObjectName = "LocalSystem"

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) = ""

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