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Virus:TR/Drop.OnLineGa.BA
Date discovered:05/02/2009
Type:Trojan
Subtype:Dropper
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:108.408 Bytes
MD5 checksum:3e20bccff021b0d7c8206aa174cc149e
IVDF version:7.01.01.233 - Thursday, February 5, 2009

 General Method of propagation:
• Autorun feature


Aliases:
   •  Mcafee: Generic PWS.ak trojan
   •  Sophos: Mal/Generic-A
   •  Panda: W32/Lineage.HXI
   •  Eset: Win32/PSW.OnLineGames.NMY
   •  Bitdefender: Trojan.PWS.OnLineGames.KCNL


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%\ierdfgh.exe
   • %drive%\n.exe



The following files are created:

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

%SYSDIR%\pytdfse0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.OnLineGa.BA




It tries to download a file:

– The location is the following:
   • http://15fdv.com/xrbv/**********
At the time of writing this file was not online for further investigation.

 Registry One of the following values is added in order to run the process after reboot:

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



The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Connections]
   New value:
   • "DefaultConnectionSettings"=hex:46,00,00,00,04,00,00,00,09,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,04,00,00,00,00,00,00,00,D0,D5,62,17,E0,74,CA,01,00,00,00,00,00,00,00,00,00,00,00,00,01,00,00,00,02,00,00,00,C0,A8,6B,64,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00

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

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

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

Description inserted by Petre Galan on Friday, December 4, 2009
Description updated by Petre Galan on Friday, December 4, 2009

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