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Virus:Worm/IrcBot.72704.2
Date discovered:06/07/2007
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:72.704 Bytes
MD5 checksum:2a91f0e5cee1d0498ead2ba35c92c5e7
IVDF version:6.39.00.107 - Friday, July 6, 2007

 General Method of propagation:
    Messenger


Aliases:
   •  Bitdefender: Win32.Worm.Palevo.BN
   •  Panda: BCK/IRCBot.CYN
   •  Eset: IRC/SdBot


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


Side effects:
   • Third party control
   • Lowers security settings
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %WINDIR%\jusched.exe
   • %WINDIR%\jusched.exb



It deletes the initially executed copy of itself.




It tries to download a file:

The location is the following:
   • http://208.43.36.96/**********




It tries to execute the following files:

Filename:
   • net stop MsMpSvc


Filename:
   • net1 stop MsMpSvc


Filename:
   • netsh firewall add allowedprogram 1.exe 1 ENABLE


Filename:
   • %WINDIR%\jusched.exe


Filename:
   • explorer.exe http://browseusers.myspace.com/Browse/Browse.aspx


Filename:
   • net stop wuauserv


Filename:
   • sc config wuauserv start= disabled


Filename:
   • net1 stop wuauserv

 Registry The following registry keys are added in order to run the processes after reboot:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Java developer Script Browse"="%WINDIR%\jusched.exe"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\
   Install\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Java developer Script Browse"="%WINDIR%\jusched.exe"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Java developer Script Browse"="%WINDIR%\jusched.exe"



It creates the following entry in order to bypass the Windows XP firewall:

[HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "%executed file%"="%WINDIR%\jusched.exe:*:Enabled:Java
      developer Script Browse"

 Messenger It is spreading via Messenger. The characteristics are described below:

 Yahoo Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: 210.170.**********.115
Port: 2345
Channel: #!gf#
Nickname: NEW-[USA|00|P|%number%]

 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 a runtime packer.

Descrição enviada por Petre Galan em quarta-feira, 10 de novembro de 2010
Descrição atualizada por Alexander Vukcevic em segunda-feira, 15 de novembro de 2010

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