ThreatExpert Report: Suspicious.Skintrim, Generic Dropper.cx, Mal/EncPk-HW

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Submission Summary:

Submission details:

Submission received: 5 June 2009, 22:45:30
Processing time: 5 min 7 sec
Submitted sample:

File MD5: 0x8D446A10F1AA0957AB33072E895B8A36
File SHA-1: 0x0617FF887CD46C2E809306C3AE9002DFC511DF8F
Filesize: 217,604 bytes
Alias:

Suspicious.Skintrim [Symantec]
Generic Dropper.cx [McAfee]
Mal/EncPk-HW [Sophos]

Summary of the findings:

What's been found	Severity Level
Downloads/requests other files from Internet.
Registers a 32-bit in-process server DLL.
Registers a Browser Helper Object (Microsoft's Internet Explorer plugin module).
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! Characteristics of the following security risks were identified in the system:

Security Risk	Description
Adware.BHO.GEN	Adware.BHO.GEN is adware that use BHOs to display ads or can be used for malicious purposes like gathering info on your surfing habits. It also has the functionality to download and install further malicious files from remote servers.
Trojan.FakeAlert	Trojan.FakeAlert will hijack the desktop background with an image alerting the user that their computer system has been infected with spyware. It also changes some settings of windows which include:- disabling permissions for the user to change the background image and setting the active desktop to 'show web content'. It is usually installed in conjunction with a rogue anti-spyware application.

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%System%\msxml71.dll	207,364 bytes	MD5: 0xEB692F43F802319B3CC95124B3F35B27 SHA-1: 0x76AB4B33D0CE665A996BB37D10F1078960FDD5EE	(not available)
2	[file and pathname of the sample #1]	217,604 bytes	MD5: 0x8D446A10F1AA0957AB33072E895B8A36 SHA-1: 0x0617FF887CD46C2E809306C3AE9002DFC511DF8F	Suspicious.Skintrim [Symantec] Generic Dropper.cx [McAfee] Mal/EncPk-HW [Sophos]

Note:

%System% is a variable that refers to the System folder. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

Memory Modifications

There was a new process created in the system:

Process Name	Process Filename	Main Module Size
[filename of the sample #1]	[file and pathname of the sample #1]	282,624 bytes

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

Module Name	Module Filename	Address Space Details
msxml71.dll	%System%\msxml71.dll	Process name: IEXPLORE.EXE Process filename: %ProgramFiles%\internet explorer\iexplore.exe Address space: 0xF80000 - 0xFF2000

Notes:

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

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}\Programmable
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}\VersionIndependentProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{56ACB669-4139-5611-CBBA-F5ACB0F4DB09}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{56ACB669-4139-5611-CBBA-F5ACB0F4DB09}\?.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML\CurVer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML.1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML.1\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{500BCA15-57A7-4eaf-8143-8C619470B13D}
HKEY_CURRENT_USER\Software\XML

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}\VersionIndependentProgID]

(Default) = "XML.XML"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}\TypeLib]

(Default) = "{56ACB669-4139-5611-CBBA-F5ACB0F4DB09}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}\ProgID]

(Default) = "XML.XML.1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}\InprocServer32]

(Default) = "%System%\msxml71.dll"
ThreadingModel = "Apartment"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{500BCA15-57A7-4eaf-8143-8C619470B13D}]

(Default) = "XML Class"
Install = "OK"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{56ACB669-4139-5611-CBBA-F5ACB0F4DB09}\?.0]

(Default) = "%System%\msxml71.dll"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML\CurVer]

(Default) = "XML.XML.1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML\CLSID]

(Default) = "{500BCA15-57A7-4eaf-8143-8C619470B13D}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML]

(Default) = "XML Class"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML.1\CLSID]

(Default) = "{500BCA15-57A7-4eaf-8143-8C619470B13D}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XML.XML.1]

(Default) = "XML Class"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{500BCA15-57A7-4eaf-8143-8C619470B13D}]

(Default) = "XML module"

[HKEY_CURRENT_USER\Software\XML]

dig3 = 0x00000000
dig16 = 0x00000004
str132 = "z+Xaaugyi4zJWjalT/99yT4dOi1Y0vdNfDSq3zazDIt3B+a8DI9HfdTr74eI4obq7e+q5mQRIYDGWsOzT95LVtcWzB6YXdXTYFyE+bVTjXEKbp33Ax+j64o373zWbutVlSwayX9oJZNw9tkgURfV/NRO5xFxlekLuJnZv6/xzAFGqgRi2KssIR0Q3lGE6Hai"
dig7 = 0x00000000
dig8 = 0x00000000
dig15 = 0x4A2E0510
dig4 = 0x00000000
dig5 = 0x00000000
dig20 = 0x00000000
dig25 = 0x00000000
dig30 = 0x00000000
dig31 = 0x00000000
dig36 = 0x00000000
dig10 = 0x4A2E0510
dig21 = 0x00005F12

Other details

To mark the presence in the system, the following Mutex objects were created:

yDDVZp8djPzA7SQGlLdL
lpJBlsrAWZI61dr6dQFt
Global\{4A0A574F-EC90-4a3f-8C4E-BA240F5991E9}
NfeAhn02Gc9NqPBvmEc8

The following Internet Connection was established:

Server Name	Server Port	Connect as User	Connection Password
last-visit.com	80	(null)	(null)

The following GET requests were made:

cset.php?id=g/7bOKg8h9+fCDOrTqwmm2saP3 0N37ZBJCH8gHKhUaEgA5PkUo9FCofikcbokMC3mLyi6m0GJ5DK W5HsWJoUVo5DwQzKDIuNNR7WpvFBgwZWMdnjBifr4v83yyvVOJ UctV1CmmRrIZgg49BRU2aejPZIsRhUxbMCr7iJ/6PuzQoD9Qx9 nLE5b25Di0qH62OzyONV6lYlrSYM3Y+LTyr5Wow7MaZd7eUcKd..
uget.php?id=g/7bOKg8h9+fCDOrTqwmm2saP3 0N37ZBJCH8gHKhUaEgA5PkUo9FCofikcbokMC3mLyi6m0GJ5DK W5HsWJoUVo5DwQzKDIuNNR7WpvFBgwZWMdnjBifr4v83yyvVOJ UctV1CmmRrIZgg49BRU2aejPZIsRhUxbMCr7iJ/6PuzQoD9Qx9 nLE5b25Di0qH62OzyONV6lYlrSYM3Y+LTyr5Wow7MaZd7eUcKd..

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