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Virus:TR/PCK.Krap.B.151
Date discovered:11/11/2008
Type:Trojan
In the wild:Yes
Reported Infections:Medium
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:108.271 Bytes
MD5 checksum:12ae4642bb27acfcb725d1acefb901c9
IVDF version:7.01.00.66 - Tuesday, November 11, 2008

 General Aliases:
   •  Symantec: Trojan.Packed.NsAnti
   •  Mcafee: Generic PWS.ak trojan !!!
   •  Kaspersky: Packed.Win32.Krap.b
   •  Panda: W32/Lineage.KDO
   •  Eset: Win32/PSW.OnLineGames.NMY
   •  Bitdefender: Trojan.Packed.39103


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%\whi.com
   • %SYSDIR%\kamsoft.exe



It deletes the initially executed copy of itself.



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



It may corrupt 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%\yudald.bat (116812) Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.carh.1

%SYSDIR%\gasretyw0.dll (85504) Detected as: TR/Crypt.ZPACK.Gen

%SYSDIR%\olhrwef.exe (116812) Detected as: TR/PSW.Magania.carh.1

%SYSDIR%\nmdfgds0.dll (75928) Detected as: TR/Crypt.ZPACK.Gen




It tries to download some files:

– The location is the following:
   • http://zsde4.com/xmfx/**********


– The location is the following:
   • http://ghterwa.com/xmfx/**********

 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]
   • "kamsoft"="%SYSDIR%\kamsoft.exe"
   • "cdoosoft"="%SYSDIR%\olhrwef.exe"



The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="mcjhjk.v"



The following registry keys are changed:

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

Various Explorer settings:
– [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%\gasretyw0.dll

    Process name:
   • %all running processes%



–  It injects the following file into a process: %SYSDIR%\nmdfgds0.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.

Beschrijving ingevoegd door Petre Galan op donderdag 15 oktober 2009
Beschrijving bijgewerkt door Andrei Ivanes op vrijdag 16 oktober 2009

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