ThreatExpert Report: Trojan.Gen.2, Generic.dx!b2z4, Win32.Malware

Submission Summary:

Submission details:

Submission received: 16 July 2012, 22:10:01
Processing time: 12 min 9 sec
Submitted sample:

File MD5: 0xF7C1B56BA5516169C2509B73A9DA86ED
File SHA-1: 0x740BE4811BF41F48CBF04205A91D2123A4E5DC1D
Filesize: 521,728 bytes

Summary of the findings:

What's been found	Severity Level
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! The following threat category was identified:

Threat Category	Description
	A malicious trojan horse or bot that may represent security risk for the compromised system and/or its network environment

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Windir%\smss.exe	176,128 bytes	MD5: 0xBC5CD9EEC1E663DEEE907049EED8103A SHA-1: 0xABC32F14649815455C3B8086D1A7AE60AD06F8BB	Trojan.Gen.2 [Symantec] Generic.dx!b2z4 [McAfee] Win32.Malware [Ikarus]
2	[file and pathname of the sample #1]	521,728 bytes	MD5: 0xF7C1B56BA5516169C2509B73A9DA86ED SHA-1: 0x740BE4811BF41F48CBF04205A91D2123A4E5DC1D	(not available)
3	%System%\smss2.cpl %System%\xcross.cpl	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)

Notes:

%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
%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 were new processes created in the system:

Process Name	Process Filename	Main Module Size
[generic host process]	[generic host process filename]	20,480 bytes
smss.exe	%Windir%\smss.exe	204,800 bytes

Notes:

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

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

Module Name	Module Filename	Address Space Details
[filename of the sample #1]	[file and pathname of the sample #1]	Process name: [generic host process] Process filename: [generic host process filename] Address space: 0x4020000 - 0x422D000

There was a new service created in the system:

Service Name	Display Name	Status	Service Filename
DCOM Service	DCOM Service	"Running"	%Windir%\smss.exe

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_DCOM_SERVICE
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_DCOM_SERVICE\0000
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_DCOM_SERVICE\0000\Control
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\DCOM Service
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\DCOM Service\Security
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\DCOM Service\Enum
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_DCOM_SERVICE
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_DCOM_SERVICE\0000
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_DCOM_SERVICE\0000\Control
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DCOM Service
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DCOM Service\Security
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DCOM Service\Enum

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_DCOM_SERVICE\0000\Control]

*NewlyCreated* = 0x00000000
ActiveService = "DCOM Service"

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_DCOM_SERVICE\0000]

Service = "DCOM Service"
Legacy = 0x00000001
ConfigFlags = 0x00000000
Class = "LegacyDriver"
ClassGUID = "{8ECC055D-047F-11D1-A537-0000F8753ED1}"
DeviceDesc = "DCOM Service"

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_DCOM_SERVICE]

NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\DCOM Service\Enum]

0 = "Root\LEGACY_DCOM_SERVICE\0000"
Count = 0x00000001
NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\DCOM Service\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\DCOM Service]

Type = 0x00000110
Start = 0x00000002
ErrorControl = 0x00000001
ImagePath = "%Windir%\smss.exe"
ObjectName = "LocalSystem"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_DCOM_SERVICE\0000\Control]

*NewlyCreated* = 0x00000000
ActiveService = "DCOM Service"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_DCOM_SERVICE\0000]

Service = "DCOM Service"
Legacy = 0x00000001
ConfigFlags = 0x00000000
Class = "LegacyDriver"
ClassGUID = "{8ECC055D-047F-11D1-A537-0000F8753ED1}"
DeviceDesc = "DCOM Service"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_DCOM_SERVICE]

NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DCOM Service\Enum]

0 = "Root\LEGACY_DCOM_SERVICE\0000"
Count = 0x00000001
NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DCOM Service\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\CurrentControlSet\Services\DCOM Service]

Type = 0x00000110
Start = 0x00000002
ErrorControl = 0x00000001
ImagePath = "%Windir%\smss.exe"
ObjectName = "LocalSystem"

The following Registry Values were modified:

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\ServiceCurrent]

(Default) =

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ServiceCurrent]

(Default) =

Other details

Analysis of the file resources indicate the following possible country of origin:

Republic of Korea

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