Virus:Worm/IrcBot.96396
Date discovered:25/04/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:96.396 Bytes
MD5 checksum:b18f1b7f0e96ac34f00fee7740915e49
IVDF version:7.10.06.198 - Sunday, April 25, 2010

 General Method of propagation:
   • Messenger


Aliases:
   •  Kaspersky: Backdoor.Win32.IRCBot.otf
   •  TrendMicro: BKDR_IRCBOT.BXR
   •  F-Secure: Backdoor.Win32.IRCBot.otf
   •  Bitdefender: Trojan.Generic.KD.8729
   •  Grisoft: Dropper.Generic2.DBY
   •  Eset: IRC/SdBot
   •  DrWeb: BackDoor.IRC.Sdbot.12237


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


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

 Files It copies itself to the following locations:
   • %WINDIR%\infocard.exe
   • %WINDIR%\infocard.exi



It deletes the initially executed copy of itself.



The following files are created:

– %WINDIR%\mdsys.s
– %WINDIR%\mdusys.s
– %WINDIR%\winbrd.jpg



It tries to executes the following files:

– Filename:
   • net stop MsMpSvc


– Filename:
   • net1 stop MsMpSvc


– Filename:
   • net stop wuauserv


– Filename:
   • net1 stop wuauserv


– Filename:
   • sc config wuauserv start= disabled


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


– Filename:
   • "%WINDIR%\infocard.exe"


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

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Firewall Administrating"="%WINDIR%\infocard.exe"

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\
   Install\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Firewall Administrating"="%WINDIR%\infocard.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Firewall Administrating"="%WINDIR%\infocard.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%\infocard.exe:*:Enabled:Firewall
      Administrating"

 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: dbs**********.com
Port: 2345
Nickname: [USA|00|P|%number%]

 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 Serban Ghiuta on Thursday, August 12, 2010
Description updated by Serban Ghiuta on Thursday, August 12, 2010

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