Full description

Virus:	TR/PSW.OnlineGames.oum
Date discovered:	26/04/2010
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:	115.712 Bytes
MD5 checksum:	d1ad8229557937bd402e36a87cd276a3
IVDF version:	7.10.06.220 - Monday, April 26, 2010

General Method of propagation:
   • Autorun feature

Aliases:
   • Sophos: Mal/EncPk-OJ
   • Panda: W32/Lineage.KDB
   • Eset: Win32/PSW.OnLineGames.OUM
   • Bitdefender: Trojan.Onlinegames.793

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%\sdfqh.exe
   • %TEMPDIR%\herss.exe

It deletes the initially executed copy of itself.

It deletes the following files:
   • %TEMPDIR%\cvasds0.dll
   • %TEMPDIR%\am.exe
   • %TEMPDIR%\am1.rar

The following files are created:

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

– %TEMPDIR%\am.exe
– %TEMPDIR%\nodqq.exe
– %drive%\i8ikdjwt.exe
– %TEMPDIR%\nodqq0.dll
– %TEMPDIR%\cvasds0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dbdz

– %TEMPDIR%\am1.rar

It tries to download some files:

– The location is the following:
   • http://www.googlewdx.com/1mg/**********

– The location is the following:
   • http://www.yahooui0.com/1mg/**********

It tries to executes the following files:

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

– Filename:
   • "%TEMPDIR%\am.exe"

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "cdoosoft"="%TEMPDIR%\herss.exe"
   • "nod32"="%TEMPDIR%\nodqq.exe"

The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="%character string%"

The following registry keys are changed:

Various Explorer settings:

– [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: %TEMPDIR%\cvasds0.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%\nodqq0.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.

설명 삽입자 Petre Galan 2010년 5월 10일 월요일
설명 업데이트 Petre Galan 2010년 5월 10일 월요일

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