Virus:TR/Drop.Agent.ahdz
Date discovered:19/02/2009
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:~100k Bytes
IVDF version:7.01.02.45 - Thursday, February 19, 2009

 General Method of propagation:
• Autorun feature


Aliases:
   •  Mcafee: Generic PWS.ak trojan
   •  Panda: W32/Lineage.KGT
   •  Eset: Win32/PSW.OnLineGames.NMY
   •  Bitdefender: Trojan.Generic.1221659


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:
   • %SYSDIR%\kamsoft.exe
   • %SYSDIR%\urretnd.exe
   • %drive%\2u.com
   • %drive%\iq.bat
   • %drive%\lel3cx.com
   • %drive%\d1vmq.exe



It overwrites a 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%\olhrwef.exe Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.carh.1

– %SYSDIR%\nmdfgds0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ZPACK.Gen

– %drive%\yudald.bat Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.carh.1

– %SYSDIR%\gasretyw0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.XPACK.Gen

– %SYSDIR%\optyhww1.dll Detected as: TR/Crypt.XPACK.Gen

– %SYSDIR%\optyhww0.dll Detected as: TR/Crypt.XPACK.Gen

– %TEMPDIR%\ker1.tmp Detected as: TR/Drop.OnLi.123904




It tries to download some files:

– The location is the following:
   • http://ghterwa.com/xmfx/**********
Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://cdfg8.com/xmfx/**********
Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://btddcc.com/xmfx/**********
Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://cderd.com/fm4/**********


– The location is the following:
   • http://vfgtyp.com/fm4/**********

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

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "cdoosoft"="%SYSDIR%\olhrwef.exe"
   • "kamsoft"="%SYSDIR%\kamsoft.exe"
   • "cbvcs"="%SYSDIR%\urretnd.exe"



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

– [HKLM\SYSTEM\CurrentControlSet\Services\AVPsys]
   • "DisplayName"="AVPsys"
   • "ErrorControl"=dword:0x00000001
   • "ImagePath"="\??\%SYSDIR%\drivers\cdaudio.sys"
   • "Start"=dword:0x00000003
   • "Type"=dword:0x00000001



The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="mcjhjk.v"



The following registry keys are changed:

– [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 Thursday, November 26, 2009
Description updated by Petre Galan on Wednesday, December 2, 2009

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