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Virus:TR/Dldr.Exchanger.W
Date discovered:23/09/2008
Type:Trojan
Subtype:Downloader
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:30.208 Bytes
MD5 checksum:5999ab88560bcb054e73e4f7a4e7f1e7
IVDF version:7.00.06.199 - Tuesday, September 23, 2008

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Panda: Trj/Agent.MFB
   •  Eset: Win32/AutoRun.FakeAlert.M
   •  Bitdefender: Win32.Worm.Autorun.OG


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


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

 Files It copies itself to the following locations:
   • %PROGRAM FILES%\Microsoft Common\svchost.exe
   • %drive%\system.exe



It overwrites a file.
%SYSDIR%\drivers\aec.sys



It deletes the initially executed copy of itself.



The following file is created:

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




It tries to download a file:

– The locations are the following:
   • http://druzg.ru/**********?v=1&rs=4230819808&n=1&uid=1
   • http://drizg.ru/**********?v=1&rs=4230819808&n=1&uid=1
At the time of writing this file was not online for further investigation.

 Registry The following registry key is added:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\explorer.exe]
   • "Debugger"="%PROGRAM FILES%\Microsoft Common\svchost.exe"

 Injection – It injects itself as a thread into a process.

    All of the following processes:
   • explorer.exe
   • svchost.exe


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

Descrizione inserita da Petre Galan su venerdì 26 febbraio 2010
Descrizione aggiornata da Petre Galan su lunedì 1 marzo 2010

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