Virus:TR/PSW.Steal.46592
Date discovered:03/11/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:94.208 Bytes
MD5 checksum:50dd1445ede1d7aa737a7943a6440811
VDF version:6.36.00.207
IVDF version:6.36.00.231 - Friday, November 3, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Spy.Win32.Banker.cew
   •  F-Secure: Trojan-Spy.Win32.Banker.cew
   •  Sophos: Troj/Nethell-G


Platforms / OS:
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops a file
   • Drops a malicious file
   • Records keystrokes
   • Registry modification
   • Steals information

 Files It deletes the initially executed copy of itself.



The following files are created:

– %SYSDIR%\nethelper.xml
– %SYSDIR%\commandhelper.xml
– %SYSDIR%\conf.dat
– %SYSDIR%\nethelper.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Steal.46592

– %SYSDIR%\accs.txt This file contains collected keystrokes.
– %SYSDIR%\fulllog.txt This file contains collected keystrokes.
– %SYSDIR%\log.txt This file contains collected keystrokes.

 Registry It registers a browser helper object (BHO) by adding the following key:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objects\{1593C741-C011-46FE-99FC-3805C28328BA}]


The following registry keys are added:

– [HKCR\NetHelper.Hook]
   • @="Hook Class"

– [HKCR\NetHelper.Hook\CLSID]
   • @="{1593C741-C011-46FE-99FC-3805C28328BA}"

– [HKCR\NetHelper.Hook\CurVer]
   • @="NetHelper.Hook.1"

– [HKCR\NetHelper.Hook.1]
   • @="Hook Class"

– [HKCR\NetHelper.Hook.1\CLSID]
   • @="{1593C741-C011-46FE-99FC-3805C28328BA}"

– [HKCR\CLSID\{1593C741-C011-46FE-99FC-3805C28328BA}]
   • @="Hook Class"

– [HKCR\CLSID\{1593C741-C011-46FE-99FC-3805C28328BA}\InprocServer32]
   • @="%SYSDIR%\nethelper.dll"
   • "ThreadingModel"="Apartment"

– [HKCR\CLSID\{1593C741-C011-46FE-99FC-3805C28328BA}\ProgID]
   • @="NetHelper.Hook.1"

– [HKCR\CLSID\{1593C741-C011-46FE-99FC-3805C28328BA}\Programmable]
– [HKCR\CLSID\{1593C741-C011-46FE-99FC-3805C28328BA}\TypeLib]
   • @="{0324D9F1-2199-4424-98C7-A0E8CC45743B}"

– [HKCR\CLSID\{1593C741-C011-46FE-99FC-3805C28328BA}\
   VersionIndependentProgID]
   • @="NetHelper.Hook"

– [HKCR\TypeLib\{0324D9F1-2199-4424-98C7-A0E8CC45743B}]
– [HKCR\TypeLib\{0324D9F1-2199-4424-98C7-A0E8CC45743B}\1.0]
   • @="NetHelper 1.0 Type Library"

– [HKCR\TypeLib\{0324D9F1-2199-4424-98C7-A0E8CC45743B}\1.0\0]
– [HKCR\TypeLib\{0324D9F1-2199-4424-98C7-A0E8CC45743B}\1.0\0\win32]
   • @="%SYSDIR%\nethelper.dll"

– [HKCR\TypeLib\{0324D9F1-2199-4424-98C7-A0E8CC45743B}\1.0\FLAGS]
   • @="0"

– [HKCR\TypeLib\{0324D9F1-2199-4424-98C7-A0E8CC45743B}\1.0\HELPDIR]
   • @="%SYSDIR%\"

– [HKCR\Interface\{54DCBD5A-3FDC-490F-B9AE-5B9DBAA39BEC}]
   • @="IHook"

– [HKCR\Interface\{54DCBD5A-3FDC-490F-B9AE-5B9DBAA39BEC}\
   ProxyStubClsid]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKCR\Interface\{54DCBD5A-3FDC-490F-B9AE-5B9DBAA39BEC}\
   ProxyStubClsid32]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKCR\Interface\{54DCBD5A-3FDC-490F-B9AE-5B9DBAA39BEC}\TypeLib]
   • @="{0324D9F1-2199-4424-98C7-A0E8CC45743B}"
   • "Version"="1.0"

 Backdoor Contact server:
All of the following:
   • http://noviid.com/**********
   • http://noviid.com/**********
   • http://noviid.com/**********
   • http://noviid.com/**********
   • http://noviid.com/**********
   • http://noviid.com/**********

As a result it may send some information. This is done via the HTTP GET request on a PHP script.


Sends information about:
    • Collected information described in stealing section

 Stealing It tries to steal the following information:
– Email account information obtained from the registry key: HKCU\Software\Microsoft\Internet Account Manager\Accounts

– A logging routine is started after one of the following websites are visited:
   • https://www3.netbank.commbank.com.au/netbank/bankmain
   • ib.national.com.au/nabib/loginProcess.ctl
   • www.national.au

– It captures:
    • Login information

 File details Programming language:
 The malware program was written in MS Visual C++.

Description inserted by Adriana Popa on Monday, November 6, 2006
Description updated by Adriana Popa on Tuesday, November 7, 2006

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