ThreatExpert Report: Trojan.Dropper, Generic Dropper!1sk, Trojan.Win32.Malagent, Backdoor.Trojan

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Submission Summary:

Submission details:

Submission received: 1 July 2012, 20:22:25
Processing time: 11 min 20 sec
Submitted sample:

File MD5: 0x4D7C8EF890E8ED953AA2B055C4431224
File SHA-1: 0xAA7E1D2BACA3834F5459BC7D7870266D6E29E066
Filesize: 131,072 bytes
Alias:

Trojan.Dropper [Symantec]
Generic Dropper!1sk [McAfee]
Trojan.Win32.Malagent [Ikarus]

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 categories were identified:

Threat Category	Description
	A malicious backdoor trojan that runs in the background and allows remote access to the compromised system
	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	%Temp%\kb21.tmp	80,896 bytes	MD5: 0x4C7F015BC56056B96E05CF6E053F0D6E SHA-1: 0x84C70B196A7C16568989E3C45AC87A4A87F1B9BC	(not available)
2	%System%\Netfilter.dll	73,728 bytes	MD5: 0x3B45236551139D5DEF5F2C7AFC3D569F SHA-1: 0xE8ABB1D0B9AB2CE7E57C5321BB05F05E1160E4B9	Backdoor.Trojan [Symantec]
3	[file and pathname of the sample #1]	131,072 bytes	MD5: 0x4D7C8EF890E8ED953AA2B055C4431224 SHA-1: 0xAA7E1D2BACA3834F5459BC7D7870266D6E29E066	Trojan.Dropper [Symantec] Generic Dropper!1sk [McAfee] Trojan.Win32.Malagent [Ikarus]

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).
%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

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

Module Name	Module Filename	Address Space Details
netfilter.dll	%System%\netfilter.dll	Process name: svchost.exe Process filename: %System%\svchost.exe Address space: 0x10000000 - 0x10017000

There was a new service created in the system:

Service Name	Display Name	Status	Service Filename
Windows Automatic Updates	Windows Automatic Updates	"Running"	%System%\svchost.exe -k netsvcs

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_WINDOWS_AUTOMATIC_UPDATES
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_WINDOWS_AUTOMATIC_UPDATES\0000
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_WINDOWS_AUTOMATIC_UPDATES\0000\Control
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Windows Automatic Updates
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Windows Automatic Updates\Parameters
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Windows Automatic Updates\Security
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Windows Automatic Updates\Enum
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WINDOWS_AUTOMATIC_UPDATES
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WINDOWS_AUTOMATIC_UPDATES\0000
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WINDOWS_AUTOMATIC_UPDATES\0000\Control
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows Automatic Updates
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows Automatic Updates\Parameters
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows Automatic Updates\Security
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows Automatic Updates\Enum

The newly created Registry Values are:

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

*NewlyCreated* = 0x00000000
ActiveService = "Windows Automatic Updates"

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

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

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

NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Windows Automatic Updates\Enum]

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

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Windows Automatic Updates\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\Windows Automatic Updates\Parameters]

ServiceDll = "%System%\Netfilter.dll"
ServiceMain = "WorkMain"

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Windows Automatic Updates]

Type = 0x00000010
Start = 0x00000002
ErrorControl = 0x00000001
ImagePath = "%System%\svchost.exe -k netsvcs"
DisplayName = "Windows Automatic Updates"
ObjectName = "LocalSystem"
Description = "Windows Automatic Updates"

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

*NewlyCreated* = 0x00000000
ActiveService = "Windows Automatic Updates"

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

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

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

NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows Automatic Updates\Enum]

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

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows Automatic Updates\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\Windows Automatic Updates\Parameters]

ServiceDll = "%System%\Netfilter.dll"
ServiceMain = "WorkMain"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows Automatic Updates]

Type = 0x00000010
Start = 0x00000002
ErrorControl = 0x00000001
ImagePath = "%System%\svchost.exe -k netsvcs"
DisplayName = "Windows Automatic Updates"
ObjectName = "LocalSystem"
Description = "Windows Automatic Updates"

The following Registry Values were modified:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost]

netsvcs =

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\ServiceCurrent]

(Default) =

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ServiceCurrent]

(Default) =

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