Full description

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.

説明の挿入者 Petre Galan の 2009年10月15日木曜日
説明の更新者 Andrei Ivanes の 2009年10月16日金曜日

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