Virus:TR/Norip.1
Date discovered:20/07/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:89.911 Bytes
MD5 checksum:c38df15f1aae333a7dac39cb9646ed55
VDF version:6.35.00.195
IVDF version:6.35.00.235

 General Method of propagation:
   • No own spreading routine


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


Side effects:
   • Disable security applications
   • Lowers security settings
   • Registry modification

 Files It copies itself to the following locations:
   • %WINDIR%\LSASS.EXE
   • %WINDIR%\EXERT.EXE
   • %WINDIR%\Debug\DebugProgram.exe

   • %SYSDIR%\MSCONFIG.EXE
   • %SYSDIR%\dxdiag.com
   • %SYSDIR%\regedit.com

   • %PROGRAM FILES%\Internet Explorer\INTEXPLORE.COM
   • %PROGRAM FILES%\Common Files\INTEXPLORE.PIF



It may corrupt the following files:
   • RAVMON.EXE
   • TROJDIE*
   • KPOP*
   • CCENTER*
   • *ASSISTSE*
   • KPFW*
   • AGENTSVR*
   • KV*
   • KREG*
   • IEFIND*
   • IPARMOR*
   • SVI.EXE
   • UPHC*
   • RULEWIZE*
   • FYGT*
   • RFWSRV*
   • RFWMA*

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • ToP = %WINDIR%\LSASS.exe



The following registry keys are added:

– [HKCR\WindowFiles]

– [HKCR\WindowFiles\DefaultIcon]
   • @ = %1

– [HKCR\WindowFiles\Shell]

– [HKCR\WindowFiles\Shell\Open]

– [HKCR\WindowFiles\Shell\Open\Command]
   • @ = %WINDIR%\EXERT.exe "%1" %*



The following registry keys are changed:

– [HKCR\.exe]
   New value:
   • @ = WindowFiles

– [HKLM\SOFTWARE\Classes\htmlfile\shell\open\command]
   Old value:
   • @ = %user defined settings%
   New value:
   • @ = "%PROGRAM FILES%\Internet Explorer\INTEXPLORE.com" -nohome

– [HKCU\Software\Microsoft\Internet Explorer\Main]
   Old value:
   • Check_Associations = %user defined settings%
   New value:
   • Check_Associations = No

– [HKCR\Applications\iexplore.exe\shell\open\command]
   Old value:
   • @ = "%PROGRAM FILES%\Internet Explorer\iexplore.exe" %1
   New value:
   • @ = "%PROGRAM FILES%\Internet Explorer\INTEXPLORE.com" %1

– [HKCR\CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\shell\
   OpenHomePage\Command]
   Old value:
   • @ = "%PROGRAM FILES%\Internet Explorer\iexplore.exe"
   New value:
   • @ = "%PROGRAM FILES%\Internet Explorer\INTEXPLORE.com"

– [HKCR\ftp\shell\open\command]
   Old value:
   • @ = %user defined settings%
   New value:
   • @ = "%PROGRAM FILES%\Internet Explorer\INTEXPLORE.com" %1

– [HKCR\htmlfile\shell\open\command]
   Old value:
   • @ = %user defined settings%
   New value:
   • @ = "%PROGRAM FILES%\Internet Explorer\INTEXPLORE.com" -nohome

– [HKCR\htmlfile\shell\opennew\command]
   Old value:
   • @ = %user defined settings%
   New value:
   • @ = "%PROGRAM FILES%\Common Files\INTEXPLORE.pif" %1

– [HKCR\http\shell\open\command]
   Old value:
   • @ = %user defined settings%
   New value:
   • @ = "%PROGRAM FILES%\Common Files\INTEXPLORE.pif" -nohome

 Process termination The following process is terminated:
   • RAVMON.EXE

Processes with one of the following strings are terminated:
   • TROJDIE; KPOP; CCENTER; ASSISTSE; KPFW; AGENTSVR; KV; KREG; IEFIND;
      IPARMOR; SVI.EXE; UPHC; RULEWIZE; FYGT; RFWSRV; RFWMA


 Backdoor Contact server:
One of the following:
   • http://upd.etsoft.com.cn/UPD/**********
   • http://upd.etsoft.com.cn/upd/**********

As a result it may send information and remote control could be provided.

 File details Programming language:
 The malware program was written in Visual Basic.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Andrei Gherman on Friday, July 28, 2006
Description updated by Andrei Gherman on Friday, July 28, 2006

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