Full description

Virus:	Worm/Taterf.DL.2
Date discovered:	18/04/2010
Type:	Worm
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	Yes
File size:	122.880 Bytes
MD5 checksum:	92a7c84e74fdd1176f3536e0d04971da
IVDF version:	7.10.06.116 - Sunday, April 18, 2010

General Aliases:
   • Bitdefender: Trojan.PWS.OnLineGames.KDHY
   • Panda: W32/Lineage.KZD
   • Eset: Win32/PSW.OnLineGames.OUM

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

Side effects:
   • Downloads malicious files
   • Drops malicious files
   • Registry modification

Files It copies itself to the following location:
   • %TEMPDIR%\xvassdf.exe

It deletes the initially executed copy of itself.

It deletes the following files:
   • %TEMPDIR%\4tddfwq0.dll
   • %TEMPDIR%\ar.exe
   • %TEMPDIR%\ar1.rar

The following files are created:

– %TEMPDIR%\4tddfwq1.dll
– %TEMPDIR%\ar1.rar
– %TEMPDIR%\4tddfwq0.dll Further investigation pointed out that this file is malware, too. Detected as: Worm/Taterf.DL.1

– %temporary internet files%\ar[1].rar
– %TEMPDIR%\ar.exe
– %temporary internet files%\ar1[1].rar

It tries to download some files:

– The location is the following:
   • http://www.googlecvn.com/1rb/**********

– The location is the following:
   • http://www.baidudfc.com/1rb/**********

It tries to executes the following files:

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

– Filename:
   • "%TEMPDIR%\ar.exe"

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
• "54dfsger"="%TEMPDIR%\xvassdf.exe"

The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
• "urlinfo"="nedsc.i"

Injection – It injects the following file into a process: %TEMPDIR%\4tddfwq0.dll

    Process name:
   • explorer.exe

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

    Process name:
   • iexplore.exe

– It injects the following file into a process: %TEMPDIR%\4tddfwq1.dll

    Process name:
   • explorer.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7月21日星期三
說明更新者 Petre Galan 開啟 2010年7月21日星期三

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