Virus:TR/PSW.Nilage.abh.1
Date discovered:01/12/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:44.217 Bytes
MD5 checksum:9934b38446510bf7518207a0da22631c
VDF version:6.36.01.114
IVDF version:6.36.01.119 - Friday, December 1, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-PSW.Win32.Nilage.abh
   •  F-Secure: Trojan-PSW.Win32.Nilage.abh
   •  Eset: Win32/PSW.Legendmir


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


Side effects:
   • Drops a file
   • Lowers security settings
   • Registry modification
   • Steals information

 Files It copies itself to the following locations:
   • %WINDIR%\SERVICES.EXE
   • %SYSDIR%\rundll32.com
   • %SYSDIR%\finder.com
   • %WINDIR%\finder.com
   • %SYSDIR%\command.pif
   • %PROGRAM FILES%\Internet Explorer\iexplore.com
   • %PROGRAM FILES%\Common Files\iexplore.pif
   • %WINDIR%\explorer.com
   • %WINDIR%\1.com
   • %WINDIR%\ExERoute.exe
   • %SYSDIR%\MSCONFIG.COM
   • %SYSDIR%\dxdiag.com
   • %SYSDIR%\regedit.com
   • %WINDIR%\Debug\DebugProgram.exe
   • D:\pagefile.pif



The following file is created:

– D:\autorun.inf This is a non malicious text file with the following content:
   • [autorun]
     OPEN=D:\pagefile.pif

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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Torjan Program"="%WINDIR%\SERVICES.EXE"



The following registry keys are added:

– [HKCR\winfiles]
– [HKCR\winfiles\DefaultIcon]
   • @="%1"

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



The following registry keys are changed:

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

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   Old value:
   • "Shell"="Explorer.exe"
   New value:
   • "Shell"="Explorer.exe 1"

– [HKCR\.exe]
   Old value:
   • @="exefiles"
   New value:
   • @="winfiles"

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

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

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

– @=""%PROGRAM FILES%\Internet Explorer\iexplore.com" %1"
   Old value:
   • @=""%PROGRAM FILES%\Internet Explorer\iexplore.exe" -nohome"
   New value:
   • @=""%PROGRAM FILES%\Internet Explorer\iexplore.com" -nohome"

– [HKCR\htmlfile\shell\opennew\command]
   Old value:
   • @=""%PROGRAM FILES%\Internet Explorer\iexplore.exe" %1"
   New value:
   • @=""%PROGRAM FILES%\common~1\iexplore.pif" %1"

– [HKCR\http\shell\open\command]
   Old value:
   • @=""%PROGRAM FILES%\Internet Explorer\iexplore.exe" -nohome"
   New value:
   • @=""%PROGRAM FILES%\common~1\iexplore.pif" -nohome"

– [HKLM\SOFTWARE\Classes\http\shell\open\command]
   Old value:
   • @=""%PROGRAM FILES%\Internet Explorer\iexplore.exe" -nohome"
   New value:
   • @=""%PROGRAM FILES%\common~1\iexplore.pif" -nohome"

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


 Stealing It tries to steal the following information:

– Passwords from the following programs:
   • World of Old Oriental Legends
   • World of Warcraft
   • Zhengtu

– A logging routine is started after one of the following websites are visited:
   • us.logon.worldofwarcraft.com
   • eu.logon.worldofwarcraft.com
   • tw.logon.worldofwarcraft.com

– It captures:
    • Login information

 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 the following runtime packer:
   • NSPack

Description inserted by Adriana Popa on Thursday, January 4, 2007
Description updated by Adriana Popa on Friday, January 5, 2007

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