ThreatExpert Report: Trojan.Win32.Agent.anbw, Trojan Horse, Generic Dropper, Mal/Dropper-O..

Visit ThreatExpert web site

Close Report

Submission Summary:

Submission details:

Submission received: 29 December 2008, 21:42:17
Processing time: 6 min 30 sec
Submitted sample:

File MD5: 0x51006B8DCCAE02F4BDB0174A09256B05
File SHA-1: 0xBF40AE1593A7A5E58B56CA78C21EBE594552C3EE
Filesize: 11,264 bytes
Alias & packer info:

Trojan Horse [Symantec]
Trojan.Win32.Agent.anbw [Kaspersky Lab]
Generic Dropper [McAfee]
Mal/Dropper-O, Mal/Mdrop-B [Sophos]
Win32.SuspectCrc [Ikarus]
packed with: UPX [Kaspersky Lab]

Summary of the findings:

What's been found	Severity Level
Registers a 32-bit in-process server DLL.
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	[file and pathname of the sample #1]	11,264 bytes	MD5: 0x51006B8DCCAE02F4BDB0174A09256B05 SHA-1: 0xBF40AE1593A7A5E58B56CA78C21EBE594552C3EE	Trojan Horse [Symantec] Trojan.Win32.Agent.anbw [Kaspersky Lab] Generic Dropper [McAfee] Mal/Dropper-O, Mal/Mdrop-B [Sophos] Win32.SuspectCrc [Ikarus] packed with UPX [Kaspersky Lab]
2	%System%\twabramn.dll	28,672 bytes	MD5: 0xF7DFD224B7EBFF6F2AB8F2750FF58C36 SHA-1: 0x64F8665F439C6922C80E2634B421BBDC6C5CE246	Trojan Horse [Symantec] Trojan.Win32.Agent.anpo [Kaspersky Lab] Generic.dx [McAfee] PWS:Win32/OnLineGames.gen!D [Microsoft] Generic.PWS.Games [Ikarus]

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]	61,440 bytes

The following modules were loaded into the address space of other process(es):

Module Name	Module Filename	Address Space Details
twabramn.dll	%System%\twabramn.dll	Process name: explorer.exe Process filename: %Windir%\explorer.exe Address space: 0x1880000 - 0x1887000
twabramn.dll	%System%\twabramn.dll	Process name: dllhost.exe Process filename: %System%\dllhost.exe Address space: 0x2530000 - 0x2537000
twabramn.dll	%System%\twabramn.dll	Process name: sdnsmain.exe Process filename: %Windir%\dns\sdnsmain.exe Address space: 0x1620000 - 0x1627000
twabramn.dll	%System%\twabramn.dll	Process name: IEXPLORE.EXE Process filename: %ProgramFiles%\internet explorer\iexplore.exe Address space: 0x3D0000 - 0x3D7000

Notes:

%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
%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\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}\Programmable
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}\VersionIndependentProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{4613FBA2-8089-4162-B3D1-D3548DDFDD89}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{4613FBA2-8089-4162-B3D1-D3548DDFDD89}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{4613FBA2-8089-4162-B3D1-D3548DDFDD89}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{4613FBA2-8089-4162-B3D1-D3548DDFDD89}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}\1.0\0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}\1.0\0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}\1.0\FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}\1.0\HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl\CurVer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl.1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl.1\CLSID

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}\VersionIndependentProgID]

(Default) = "Zx.shatl"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}\TypeLib]

(Default) = "{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}\ProgID]

(Default) = "Zx.shatl.1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}\InprocServer32]

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

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{73D96662-B874-4B3F-AE9C-BC69CB7CB372}]

(Default) = "shatl Class"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{4613FBA2-8089-4162-B3D1-D3548DDFDD89}\TypeLib]

(Default) = "{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}"
Version = "1.0"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{4613FBA2-8089-4162-B3D1-D3548DDFDD89}\ProxyStubClsid32]

(Default) = "{00020424-0000-0000-C000-000000000046}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{4613FBA2-8089-4162-B3D1-D3548DDFDD89}\ProxyStubClsid]

(Default) = "{00020424-0000-0000-C000-000000000046}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{4613FBA2-8089-4162-B3D1-D3548DDFDD89}]

(Default) = "Ishatl"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}\1.0\0\win32]

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

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}\1.0\HELPDIR]

(Default) = "%System%\"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}\1.0\FLAGS]

(Default) = "0"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D1565B8B-ECAD-4AC6-A128-24C64141E1CF}\1.0]

(Default) = "zx 1.0 Type Library"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl\CurVer]

(Default) = "Zx.shatl.1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl\CLSID]

(Default) = "{73D96662-B874-4B3F-AE9C-BC69CB7CB372}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl]

(Default) = "shatl Class"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl.1\CLSID]

(Default) = "{73D96662-B874-4B3F-AE9C-BC69CB7CB372}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Zx.shatl.1]

(Default) = "shatl Class"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellExecuteHooks]

{73D96662-B874-4B3F-AE9C-BC69CB7CB372} = ""

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad]

%System%\twabramn.dll = "{73D96662-B874-4B3F-AE9C-BC69CB7CB372}"

Other details

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

China

There was application-defined hook procedure installed into the hook chain (e.g. to monitor keystrokes). The installed hook is handled by the following module:

%System%\twabramn.dll

All content ("Information") contained in this report is the copyrighted work of Threat Expert Ltd and its associated companies ("ThreatExpert") and may not be copied without the express permission of ThreatExpert.

The Information is provided on an "as is" basis. ThreatExpert disclaims all warranties, whether express or implied, to the maximum extent permitted by law, including the implied warranties that the Information is merchantable, of satisfactory quality, accurate, fit for a particular purpose or need, or non-infringing, unless such implied warranties are legally incapable of exclusion. Further, ThreatExpert does not warrant or make any representations regarding the use or the results of the use of the Information in terms of their correctness, accuracy, reliability, or otherwise.