Virus:TR/Drop.Agent.agla
Date discovered:26/02/2009
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:High
Static file:Yes
File size:172.207 Bytes
MD5 checksum:d6614007059d24844269db6ef460e4d9
IVDF version:7.01.01.239 - Friday, February 6, 2009

 General Aliases:
   •  Symantec: W32.SillyFDC
   •  Sophos: Mal/Generic-A
   •  Panda: W32/Lineage.KYR
   •  Eset: Win32/PSW.OnLineGames.NNU


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


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

 Files It copies itself to the following locations:
   • %SYSDIR%\kva8wr.exe
   • %drive%\jbele1.com



It renames the following files:

    •  %malware execution directory% into c:\%existing file or directory%.vcd



It deletes the initially executed copy of itself.



It deletes the following file:
   • %SYSDIR%\drivers\cdaudio.sys



It may corrupt the following file:
   • %SYSDIR%\drivers\cdaudio.sys



The following files are created:

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

– %SYSDIR%\drivers\klif.sys Further investigation pointed out that this file is malware, too. Detected as: Rkit/Agent.4160

– %SYSDIR%\bgotrtu0.dll Detected as: TR/Vundo

– %SYSDIR%\uweyiwe0.dll Detected as: TR/Crypt.XPACK.Gen

– %drive%\lot.exe
– %SYSDIR%\ahnfgss0.dll
– %SYSDIR%\ahnsbsb.exe
– %SYSDIR%\ahnxsds0.dll



It tries to download some files:

– The location is the following:
   • http://hjkio.com/xhg2/**********


– The location is the following:
   • http://kioytrfd.com/xhg2/**********

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

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "kvasoft"="%SYSDIR%\kva8wr.exe"



The following registry keys are added in order to load the service after reboot:

– [HKLM\SOFTWARE\System\CurrentControlSet\Services\KAVsys]
   • "Type"=dword:00000001
      "Start"=dword:00000001
      "ErrorControl"=dword:00000001
      "ImagePath"="\??\%SYSDIR%\drivers\klif.sys"
      "DisplayName"="KAVsys"



The following registry keys are changed:

Various Explorer settings:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NoDriveTypeAutoRun"=dword:00000091

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "ShowSuperHidden"=dword:00000001
     "Hidden"=dword:00000002

 Injection –  It injects the following file into a process: %SYSDIR%\uweyiwe0.dll


– It injects a process watching routine into a process.

    Process name:
   • explorer.exe


 Rootkit Technology Hides the following:
– Its own process


Method used:
    • Hidden from Master File Table (MFT)
    • Hidden from Windows API
    • Hidden from Interrupt Descriptor Table (IDT)

Description inserted by Petre Galan on Monday, July 6, 2009
Description updated by Petre Galan on Tuesday, August 18, 2009

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