Virus:TR/PSW.Onlineg.ALZR
Date discovered:05/03/2009
Type:Trojan
In the wild:Yes
Reported Infections:Medium
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:168.420 Bytes
MD5 checksum:42438a0F0D9501bf1370287ff4b451bd
IVDF version:7.01.02.122 - Thursday, March 5, 2009

 General Aliases:
   •  Symantec: Infostealer.Gampass
   •  Mcafee: Generic PWS.ak trojan !!!
   •  Kaspersky: Trojan.Win32.Agent2.eij
   •  Sophos: Mal/EncPk-HI
   •  Panda: W32/Lineage.KYR
   •  Eset: Win32/PSW.OnLineGames.NMY
   •  Bitdefender: Trojan.PWS.OnLineGames.KCND


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Downloads malicious files
   • Drops malicious files
   • Lowers security settings
   • Registry modification

 Files It copies itself to the following locations:
   • %drive%\d8k6hg.com
   • %SYSDIR%\kva8wr.exe



It overwrites a file.
– %SYSDIR%\drivers\cdaudio.sys



It deletes the initially executed copy of itself.



It deletes the following file:
   • %SYSDIR%\drivers\cdaudio.sys



The following files are created:

– %drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

– %drive%\gjnfah.cmd (176444) Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ZPACK.Gen

– %SYSDIR%\ahnsbsb.exe (176444) Detected as: TR/Crypt.ZPACK.Gen

– %SYSDIR%\bgotrtu0.dll (73728) Detected as: TR/PSW.OnLin.ALZR.1

– %SYSDIR%\ahnfgss0.dll (88576) Detected as: TR/Crypt.ZPACK.Gen

– %SYSDIR%\uweyiwe0.dll (97280) Detected as: TR/Crypt.XPACK.Gen

– %SYSDIR%\ahnxsds0.dll (81920) Detected as: TR/Crypt.ZPACK.Gen




It tries to download some files:

– The location is the following:
   • http://yklop.com/xhg2/**********
Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://kioytrfd.com/xhg2/**********

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

– [HKLM\SYSTEM\CurrentControlSet\Services\AVPsys]
   • "Start"=dword:0x3
   • "Type"=dword:0x1
   • "ImagePath"="\??\%SYSDIR%\drivers\cdaudio.sys"
   • "DisplayName"="AVPsys"
   • "ErrorControl"=dword:0x1



One of the following values is added in order to run the process after reboot:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "ahnsoft"="%SYSDIR%\ahnsbsb.exe"
   • "kvasoft"="%SYSDIR%\kva8wr.exe"



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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objects\{238C32AB-955D-4707-AAB9-C9B3AB8D4225}]
– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objects\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}]


The following registry keys are added:

– [HKLM\SOFTWARE\Classes\CLSID\MNDOWN]
   • "urlinfo"="m1chgt.e"

– [HKLM\SOFTWARE\Classes\CLSID\
   {238C32AB-955D-4707-AAB9-C9B3AB8D4225}]
   • "(default)"="IEHlprObj Class"

– [HKLM\SOFTWARE\Classes\CLSID\{238C32AB-955D-4707-AAB9-C9B3AB8D4225}\
   InprocServer32]
   • "ThreadingModel"="Apartment"
   • "(default)"="%SYSDIR%\ahnxsds0.dll"

– [HKLM\SOFTWARE\Classes\CLSID\{238C32AB-955D-4707-AAB9-C9B3AB8D4225}\
   ProgID]
   • "(default)"="IEHlprObj.IEHlprObj.1"

– [HKLM\SOFTWARE\Classes\Interface\
   {238C32AC-955D-4707-AAB9-C9B3AB8D4225}]
   • @="IIEHlprObj"

– [HKLM\SOFTWARE\Classes\Interface\
   {238C32AC-955D-4707-AAB9-C9B3AB8D4225}\ProxyStubClsid]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\Interface\
   {238C32AC-955D-4707-AAB9-C9B3AB8D4225}\ProxyStubClsid32]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\Interface\
   {238C32AC-955D-4707-AAB9-C9B3AB8D4225}\TypeLib]
   • "Version"="1.0"
   • @="{238C32A2-955D-4707-AAB9-C9B3AB8D4225}"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}]
   • @="IIEHlprObj"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\ProxyStubClsid]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\ProxyStubClsid32]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\Interface\
   {238C32AC-955D-4707-AAB9-C9B3AB8D4225}\TypeLib]
   • Version"="1.0"
   • @="{238C32A2-955D-4707-AAB9-C9B3AB8D4225}"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}]
   • @="IIEHlprObj"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\ProxyStubClsid]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\ProxyStubClsid32]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\TypeLib]
   • "Version"="1.0"
   • @="{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {238C32A2-955D-4707-AAB9-C9B3AB8D4225}\1.0]
   • @="IEHelper 1.0 Type Library"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {238C32A2-955D-4707-AAB9-C9B3AB8D4225}\1.0\0\win32]
   • @="%SYSDIR%\ahnxsds0.dll"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {238C32A2-955D-4707-AAB9-C9B3AB8D4225}\1.0\FLAGS]
   • @="0"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {238C32A2-955D-4707-AAB9-C9B3AB8D4225}\1.0\HELPDIR]
   • @="%SYSDIR%\"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0]
   • @="IEHelper 1.0 Type Library"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\0\win32]
   • @="%SYSDIR%\bgotrtu0.dll"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\FLAGS]
   • @="0"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\HELPDIR]
   • @="%SYSDIR%\"



The following registry keys are changed:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x0

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x2
   • "ShowSuperHidden"=dword:0x0

 Injection –  It injects the following file into a process: %SYSDIR%\ahnfgss0.dll

    Process name:
   • %all running processes%


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

Descrição enviada por Petre Galan em segunda-feira, 19 de outubro de 2009
Descrição atualizada por Petre Galan em segunda-feira, 19 de outubro de 2009

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