1. Symantec/
  2. Security Response/
  3. W32.Randex.GEL


Risk Level 2: Low

August 18, 2006
February 13, 2007 12:58:21 PM
Also Known As:
WORM_RANDEX.AM [Trend], W32/Sdbot.worm!MS06-040 [McAfe, W32/Kassbot-V [Sophos], W32./Vanebot-A [Sophos], W32/Rbot-FKR [Sophos]
Systems Affected:

When W32.Randex.GEL is executed, it performs the following actions:
  1. Creates one of the following files:

    • %System%\javanet.exe
    • %System%\msjava.exe
    • %System%\xpjavams.exe
    • %System%\wunosjava.exe
    • %System%\creative.exe
    • %System%\netapi.exe
    • %System%\msguard.exe
    • %System%\javaapplets.exe
    • %System%\jconsole.exe
    • %System%\winservnt32.exe
    • %System%\wkssvr.exe

      Note: %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  2. Adds one of the following values:

    "MS Java for Windows XP & NT" = "javanet.exe"
    "MS Java for Windows NT" = "msjava.exe"
    "MS Java Applets for Windows NT, ME & XP" = "javaapplets.exe"
    "Sun Java Console for Windows NT & XP" = "jconsole.exe"
    "Windows Kernel System Service" = "wkssvr.exe"

    to the registry subkeys:


    so that the worm starts when Windows starts.

  3. Adds the values:

    "Shell" = "Explorer.exe javanet.exe"
    "Userinit" = "%System%\userinit.exe,javanet.exe"


    "Shell" = "Explorer.exe msjava.exe"
    "Userinit" = "%System%\userinit.exe,msjava.exe"


    "Shell" = "Explorer.exe javapllets.exe"
    "Userinit" = "%System%\userinit.exe,javaapplets.exe"


    "Shell" = "Explorer.exe jconsole.exe"
    "Userinit" = "%System%\Userinit.exe,jconsole.exe"


    "Shell" = "Explorer.exe winservnt.exe"
    "Userinit" = "%System%\Userinit.exe,winservnt32.exe"


    "Shell" = "Explorer.exe wkssvr.exe"
    "Userinit" = "C:\WINDOWS\System32\userinit.exe,wkssvr.exe"

    to the registry subkey:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT

    so that the worm starts when Windows starts.

  4. Adds one of the values:

    "%System%javanet.exe" = "%System%\javanet.exe:*:Enabled:MS Java for Windows XP & NT"
    "%System%\msjava.exe" = "%System%\msjava.exe:*:Enabled:MS Java for Windows NT"
    "%System%javaapplets.exe" = "%System%\javaapplets.exe:*:Enabled:MS Java Applets for Windows NT, ME & XP"
    "%System%jconsole.exe" = "%System%jconsole.exe:*:Enabled:Sun Java Console for Windows NT & XP"
    "%System%\winservnt32.exe" = "%System%\winservnt32.exe:*:Enabled:Ms Update WinServices NT/XP"

    to the registry subkeys:


    to modify the firewall settings.

  5. Adds the values:

    "JavaNet" = "rBot v2 a.k.a. the next generation (working on winXP SP2)"
    "upppuz" = "rBot v2 a.k.a. the next generation (working on winXP SP2)"
    "javaapplets" = "rBot v2 a.k.a. the next generation (working on winXP SP2) - [REMOVED]"
    "javaconsole" = "rBot v2 a.k.a. the next generation (working on winXP SP2) - [REMOVED]"
    "WinServ" = "rBot v2 a.k.a. the next generation (working on winXP SP2)"

    to the registry subkey:


  6. Adds the values:

    "DoNotAllowXPSP2" = "1"
    "DoNotAllowXPSP3" = "1"

    to the registry subkey:


  7. Adds the value:

    "MS Update WinServices NT/XP" = "winservnt32.exe"

    to the registry subkeys:


  8. Modifies the value:

    "EnableDCOM" = "N"

    in the registry subkey:


    which disables DCOM on the compromised computer.

  9. Modifies the value:

    "restrictanonymous" = "1"

    in the registry subkey:


    which prevents NULL session enumeration of the host.

  10. Modifies the value:

    "Start" = "4"

    in the registry subkeys:



    to prevent certain software from running automatically when Windows starts.

  11. Modifies the value:

    "LMCompatibilityLevel" = "1"

    in the registry subkeys:


  12. Attempts to steal information entered into browser windows with the following URL:


  13. Opens a back door on the compromised computer, attempting to connect to some of the following IRC servers on the TCP ports specified below:

    • tc.danknugs.be (,, TCP port 9568
    • aboutus.hottest.es ( TCP port 4915
    • contacts.hottest.es ( TCP port 4915
    • forum.ednet.es ( TCP port 4915
    • new.cheapdf.com ( TCP port 4545
    • fbi32.cheapdf.com ( TCP port 9568
    • TCP port 4915
    • TCP port 4915
    • mak.smokedro.com TCP port 8080
    • fat.hack010.gy.net TCP port 5411
    • c.suicidegaming.com TCP port 9568

      Please note the threat must connect to an IRC server before replicating or conducting any attacks.

  14. Listens for commands, which may allow a remote attacker to perform some of the following actions on the compromised computer:

    • Download and execute files
    • List, stop, and start processes and threads
    • Launch SYN, UDP and HTTP denial of service attack
    • Open a command shell on the compromised computer
    • Start a SOCKS4 proxy server
    • Log keystrokes

  15. Spread to other computers by sending URL links through MSN Messenger, Yahoo Messenger, AOL Instant Messenger and ICQ.

  16. Copies itself to network shares and Microsoft SQL servers, using the following list of usernames and passwords:

    User names:

    • admin
    • root
    • asdfgh
    • server
    • 0
    • 00
    • 000
    • 0000
    • 00000
    • 000000
    • 0000000
    • 00000000
    • 1
    • 12
    • 123
    • 1234
    • 12345
    • 123456
    • 1234567
    • 12345678
    • 123456789
    • secret
    • secure
    • security


    • setup
    • shadow
    • shit
    • sql
    • super
    • sys
    • system
    • abc
    • abc123
    • access
    • adm
    • alpha
    • anon
    • anonymous
    • backdoor
    • backup
    • beta
    • bin
    • coffee
    • computer
    • crew
    • database
    • debug
    • default
    • demo
    • free
    • go
    • guest
    • hello
    • install
    • internet
    • login
    • mail
    • manager
    • money
    • monitor
    • network
    • new
    • newpass
    • nick
    • nobody
    • nopass
    • one
    • oracle
    • pass
    • passwd
    • password
    • poiuytre
    • private
    • pub
    • public
    • qwerty
    • random
    • real
    • remote
    • ruler
    • telnet
    • temp
    • test
    • test1
    • test2
    • visitor
    • web
    • windows

  17. Spreads to other computers by exploiting one or more of the following vulnerabilities:

  18. Ends processes that contain any of the following strings:

    • anti
    • viru
    • troja
    • avp
    • nav
    • rav
    • reged
    • nod32
    • spybot
    • zonea
    • vsmon
    • avg
    • blackice
    • firewall
    • lockdown
    • f-pro
    • mcafee
    • norton
    • avast


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Kazumasa Itabashi
Summary| Technical Details| Removal

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