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Virus:ADSPY/BaiduBar.P
Date discovered:02/10/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:19.968 Bytes
MD5 checksum:306cee9a4db1909c45960c79980413fd
VDF version:6.36.00.71
IVDF version:6.36.00.86 - Monday, October 9, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan.Win32.Agent.tl
   •  F-Secure: Trojan.Win32.Agent.tl
   •  Eset: Win32/Agent.TL


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


Side effects:
   • Downloads malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %TEMPDIR%\%random character string%.tmp



It creates the following directory:
   • %SYSDIR%\A4\baisob\update



The following files are created:

– Non malicious files:
   • %SYSDIR%\A4\baisob\update\updatefile.lst
   • %SYSDIR%\A4\baisob\update\waitdown.lst




It tries to download some files:

– The location is the following:
   • soft.baiso.com.cn/02/**********
It is saved on the local hard drive under: %SYSDIR%\A4\baisob\update\up.dat

– The location is the following:
   • ad.baiso.com.cn/02/**********
It is saved on the local hard drive under: %SYSDIR%\A4\baisob\update\adout.dat This file may contain further download locations and might serve as source for new threats.

– The location is the following:
   • down.lons.cn/02/**********
It is saved on the local hard drive under: %SYSDIR%\A4\baisob\update\verx.dat

– The location is the following:
   • down.lons.cn/**********
It is saved on the local hard drive under: %SYSDIR%\A4\baisob\update\realupdate.exe At the time of writing it was an updated version of the malware itself.

– The location is the following:
   • down.lons.cn/02/**********
It is saved on the local hard drive under: %SYSDIR%\A4\baisob\update\dlldostb.dll

– The location is the following:
   • down.lons.cn/02/**********
It is saved on the local hard drive under: %SYSDIR%\A4\baisob\update\novel.exe

– The location is the following:
   • down.lons.cn/02/**********
It is saved on the local hard drive under: %SYSDIR%\A4\baisob\update\winampb.exe Further investigation pointed out that this file is malware, too.

– The location is the following:
   • down.lons.cn/02/**********
It is saved on the local hard drive under: %SYSDIR%\A4\baisob\update\avpb.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Drop.Agent.awb.10

 Registry The following registry key is added:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\baisob]
   • "SetupPath"="%SYSDIR%\A4\baisob"
   • "main"="1.0.0.14"
   • "selfUpdate"="1.0.0.17"
   • "otherUpdate"="1.0.0.16"
   • "2"="2.0.1.248"

 Miscellaneous  Checks for an internet connection by contacting the following web site:
   • www.microsoft.com

 File details Programming language:
The malware program was written in MS Visual C++.


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 Friday, October 6, 2006
Description updated by Adriana Popa on Monday, October 9, 2006

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