Virus:TR/PSW.Viking.A
Date discovered:27/11/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:80.896 Bytes
MD5 checksum:ef23dd7d7d60a9721f3d8bf6d0ed4a78
VDF version:6.36.01.88
IVDF version:6.36.01.92 - Monday, November 27, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Mcafee: PWS-Gamania
   •  Kaspersky: Trojan-PSW.Win32.Hangame.cl
   •  F-Secure: Trojan-PSW.Win32.Hangame.cl
   •  Bitdefender: Win32.AV-Killer

It was previously detected as:
   •  Worm/Viking.A


Platforms / OS:
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops a file
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • %PROGRAM FILES%\Windows Media Player\svchost.exe



It deletes the initially executed copy of itself.



The following files are created:

– A file that is for temporary use and it might be deleted afterwards:
   • %TEMPDIR%\$$c%hex number%.tmp

– %SYSDIR%\PDLL.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Lineage.anb

– %TEMPDIR%\$$c%hex number%.tmp.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

 Registry The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   Old value:
   • "Userinit"="%SYSDIR%\userinit.exe,"
   New value:
   • "Userinit"="%SYSDIR%\userinit.exe,%PROGRAM FILES%\Windows Media Player\svchost.exe,"

 Stealing It tries to steal the following information:

– The password from the following program:
   • Lineage

– A logging routine is started after a website is visited:
   • http://tw.login.yahoo.com/cgi-bin/login.cgi?srv=

– It captures:
    • Login information

 Injection –  It injects the following file into a process: PDLL.dll

    Process name:
   • %all running processes%


 File details Programming language:
 The malware program was written in Delphi.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • UPX

Description inserted by Adriana Popa on Thursday, November 23, 2006
Description updated by Adriana Popa on Monday, November 27, 2006

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