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Virus:BDS/IRCBot.DL.35
Date discovered:17/06/2010
Type:Backdoor Server
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:208.896 Bytes
MD5 checksum:896f8e343996a307b0169f0212fae8ff
VDF version:7.10.03.151
IVDF version:7.10.08.120 - Thursday, June 17, 2010

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Kaspersky: Trojan.Win32.VBKrypt.ctmd
   •  Bitdefender: Worm.Generic.317684
   •  Microsoft: Backdoor:Win32/IRCbot.DL
   •  GData: Worm.Generic.317684
   •  DrWeb: Trojan.DownLoader2.39345


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


Side effects:
   • Drops malicious files
   • Registry modification
   • Steals information

 Files It copies itself to the following locations:
   • %HOME%\Application Data\Microsoft\svchost.exe
   • %drive%\svchost.exe



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 execute the following file:

– Filename:
   • %HOME%\Application Data\Microsoft\svchost.exe

 Registry The following registry key is added in order to run the process after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "svchost.exe"="%HOME%\Application Data\Microsoft\svchost.exe"

 Backdoor Contact server:
The following:
   • sarahblogdns.bou**********.net:3085 (TCP)


 Stealing – Recorded passwords used by the AutoComplete function

– Passwords from the following programs:
   • Mozilla Firefox
   • Internet Explorer

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

    Process name:
   • svchost.exe


 Miscellaneous Mutex:
It creates the following Mutex:
   • HelloDDoser

 File details Programming language:
The malware program was written in Delphi.


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 Monday, July 18, 2011
Description updated by Petre Galan on Monday, July 18, 2011

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