Full description

Virus:	TR/PSW.Magan.carh.1
Date discovered:	11/12/2009
Type:	Trojan
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Low to medium
Damage Potential:	Low to medium
Static file:	Yes
File size:	116.812 Bytes
MD5 checksum:	f1bae35d296930d2076b9d84ba0c95ea
IVDF version:	7.10.01.219 - Friday, December 11, 2009

General Method of propagation:
   • Autorun feature

Aliases:
   • Sophos: Mal/Taterf-B
   • Panda: W32/Lineage.KFS
   • Eset: Win32/PSW.OnLineGames.NNU
   • Bitdefender: Trojan.Generic.3002857

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

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

Files It copies itself to the following locations:
   • %SYSDIR%\olhrwef.exe
   • %drive%\yudald.bat

It deletes the initially executed copy of itself.

The following files are created:

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

– %SYSDIR%\nmdfgds0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ZPACK.Gen

It tries to download a file:

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

It tries to executes the following file:

– Filename:
   • "%PROGRAM FILES%\Internet Explorer\IEXPLORE.EXE"

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "cdoosoft"="%SYSDIR%\olhrwef.exe"

The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NoDriveTypeAutoRun"=dword:0x00000091

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000000

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

    Process name:
   • explorer.exe

– It injects itself as a remote thread into a process.

    Process name:
   • iexplore.exe

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

說明撰寫者 Petre Galan 開啟 2010年6月10日星期四
說明更新者 Petre Galan 開啟 2010年6月10日星期四

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