W32.Hobble.C@mm

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Discovered: October 09, 2002
Updated: February 13, 2007 11:51:27 AM
Also Known As: I-Worm.Alcaul.ab [AVP], I-Worm.generic [AVP], W32/Hobbit.b@MM [McAfee], W32/Hobbit.c@MM [McAfee], WORM_HOBBIT.B [Trend]
Type: Worm
Systems Affected: Windows


W32.Hobble.C@mm is a worm that attempts to spread across the KaZaA file-sharing network. It has mass-mailing capabilities. It can send itself to email addresses that it retrieves from .htm and .html files that it finds in the Internet Explorer cache, and to all addresses in the Microsoft Outlook Address Book. The email messages have the following characteristics:

  • Message 1
    This is sent to all addresses in the Microsoft Outlook Address Book.
    Subject: Fwd: Scan your computer for this new virus threat...
    Attachment: Anti-Bug.exe
  • Message 2
    This is sent to all addresses that it retrieves from .htm and .html files.
    Subject: AntiVirus Updates:
    Attachment 1: One of many with the .scr, .exe, .bat, or .pif file extension.
    Attachment 2: One of many with the .theme, .zip, or .bat file extension.





NOTE: Virus definitions prior to October 10, 2002, detect this threat as W32.Hobble@mm.

Antivirus Protection Dates

  • Initial Rapid Release version October 10, 2002
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version October 10, 2002
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date October 16, 2002

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Douglas Knowles

Discovered: October 09, 2002
Updated: February 13, 2007 11:51:27 AM
Also Known As: I-Worm.Alcaul.ab [AVP], I-Worm.generic [AVP], W32/Hobbit.b@MM [McAfee], W32/Hobbit.c@MM [McAfee], WORM_HOBBIT.B [Trend]
Type: Worm
Systems Affected: Windows


When W32.Hobble.C@mm runs, it does the following:

If the operating system is Windows 95/98/Me, the worm registers itself as a service process so that it continues to run after you log off. In this case, W32.Hobble.C@mm closes only when you shut down the computer.

The worm copies itself to:

  • %windir%\Anti-Bug.exe
  • %windir%\Shizzle.exe

NOTE: %windir% is a variable. The worm locates the Windows installation folder (by default this is C:\Windows or C:\Winnt) and copies itself to that location.

It also adds the value:

WinSrv %windir%\Shizzle.exe

to the registry key

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

To replicate across the KaZaA file-sharing network , the worm copies itself as these file names:
  • WIN XPCrack.exe
  • All GamesHack.exe
  • ICQ Password Hack.exe
  • HotMailHack.exe
  • Unreal Tournament 3 FullDownloader.exe
  • WarCraft III Full.exe
  • Swat 3 Full Download.exe
  • Macromedia Flash MX.exe
  • Tacony.exe
  • HotMailHack.exe
  • Credit Cards.exe

into these folders (if they exist):
  • C:\KaZaA\My Shared Folder
  • C:\Program Files\KaZaA\My Shared Folder

The first mass-mailing portion of the worm sends itself to all addresses in the Outlook Address Book. This email message has the following characteristics:

Message Body:   This is a fix and removal for the new internet worm known as BugBear. 1 in ever 4 computers in infected with this virus. When run, it will scan your computer and notify you if you're infected or not, then clean if infected
Subject: Fwd: Scan your computer for this new virus threat...
Attachment: Anti-Bug.exe

The second mass-mailing portion of the worm scans all .htm and .html files in the Internet Explorer cache and retrieves email addresses from mailto: links. The retrieved addresses are stored in a file named Email.txt, which the worm drops into the same folder. It then retrieves the user name, email address, and SMTP server and sends itself to the retrieved contacts in the following format:

Message Body : A Removal to scan for the new BugBear Virus. Recommended by <User name>
Subject : AntiVirus Updates:
Attachment 1 : (49,152 bytes)
The file name of the first attachment is randomly selected from the following list:
  • I-Explorer7.0
  • Morpheus_Update_Fix
  • Kaza_Lite_Update_Fix
  • Kaza_Fix
  • Edonkey_Fix
  • WinXP_Crack
  • Symantec_KeyGen
  • McAffea_KeyGen
  • Flock_Update
  • Bearshare_Fix
  • New_Napster_Clone
  • Pamela_Live_F***ing
  • Beyond_FF11
  • Final_Fantasy10
  • Reboot
  • Claudia_Schiffer
  • FullSpeed
  • Email Bomber
  • FTP Cracker
  • Hotmail Hacker Tool
  • Anti 0190 Dialer
  • WinMx Hack
  • Britney Spears Nude
  • Shakira Nude
  • Jenifer Lopez Naked
  • Ps2 Emulator
  • Cube Emulator
  • Ps2 Crack
  • XBox Emulator
  • Borland Delphi 6 Key
  • Borland Delphi(all) Crack

The attached file has one the following extensions:
  • .exe
  • .pif
  • .bat
  • .scr

The attached file is a copy of the worm that was dropped into the same folder as the folder from which the worm was executed.

Attachment 2: (Random file size)
The file name of the second attachment is randomly selected from this list:
  • Shakira Nude.theme
  • BackstreetBoys.theme
  • Goldfinger.theme
  • Shrek.theme
  • LordoftheRings.theme
  • StarWars.theme
  • MichelleBranch.theme
  • TheHives.theme
  • DrNo.theme
  • JamesBond.theme
  • NSync.theme
  • AddamsFamily.theme
  • SamuraiX.theme
  • DragonballZ.theme
  • Hackers.theme
  • PlayboyCenterFolds.theme
  • BritneySpearsNude.theme
  • ChristinaAguilera.theme
  • Energy.theme
  • alcopaul.theme
  • XXX.theme
  • NicoleKidman***.theme
  • CourtneyCoxNude.theme
  • LearnVisualBasic.zip
  • LearnVisualC.zip
  • LearnVisualFoxPro.zip
  • LearnPHP.zip
  • LearnHTML.zip
  • LearnKylix.zip
  • SecretsOfMicrosoftdotNET.zip
  • LearnCSharp.zip
  • LearnVisualBasic.NET.zip
  • CplusplusUnleashed.zip
  • Hacking101.zip
  • EroticStories.zip
  • SecretsofLaoTse.zip
  • Phreaking.zip
  • CIASecrets.zip
  • VirusWriting.zip
  • TipsOnMakingYourPartnerWild.zip
  • CreditCardNumbers.zip
  • NewsweekSeptemberEditionCompressed.zip
  • TroubleshootingyourComputer.zip
  • CounterStrikeCheats.zip
  • JokeForTheDay.zip
  • MakeMillions.zip
  • YouWantToBeAMillionaire.zip
  • DisneyBedTimeStories.zip
  • StephenKingUnreleasedNotes.zip
  • NikolaTeslaNotes.zip
  • SecretsOfAlbertEinstein.zip
  • ThomasEdisonSecrets.zip
  • AlexanderGrahamBellSecrets.zip
  • HackSQLServersScript.bat
  • HackIISServersScript.bat
  • HackMozillaServersScript.bat
  • HackHotmailScript.bat
  • HackYahooScript.bat
  • HackApacheServersScript.bat
  • HackXBoxScript.bat
  • HackPayPalScript.bat
  • WindowsSourceCodeRedirect.bat
  • RedirectMeToHollywood.bat
  • Morpheus_Update_Fix.bat
  • Kaza_Lite_Update_Fix.bat
  • Kaza_Fix.bat
  • Edonkey_Fix.bat
  • WinXP_Crack.bat
  • Symantec_KeyGen.bat
  • McAffea_KeyGen.bat
  • Flock_Update.bat
  • Bearshare_Fix.bat
  • New_Napster_Clone.bat
  • Pamela_Live_***.bat
  • Beyond_FF11.bat
  • Final_Fantasy10.bat
  • Reboot.bat
  • Claudia_Schiffer.bat
  • FullSpeed.bat
  • Email Bomber.bat
  • FTP Cracker.bat
  • Hotmail Hacker Tool.bat
  • Anti 0190 Dialer.bat
  • WinMx Hack.bat
  • Britney Spears Nude.bat

To generate a file for the second attachment, the worm performs the following actions:
  • If the file name has the .zip extension, the worm downloads a zip utility from a Web site, drops it as Zippy.exe in the same folder, and runs it to produce the zipped copy of the worm.
  • If the file name has the .theme or .bat extension, the worm attempts to produce a text file with the encoded worm body. When the worm runs, it is supposed to use the legitimate debug utility to drop the binary of the worm and then execute it. Due to bugs, the .theme or .bat files do not appear to be successfully produced.

After performing the previously mentioned actions, the worm displays this message:



Recommendations

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: Douglas Knowles

Discovered: October 09, 2002
Updated: February 13, 2007 11:51:27 AM
Also Known As: I-Worm.Alcaul.ab [AVP], I-Worm.generic [AVP], W32/Hobbit.b@MM [McAfee], W32/Hobbit.c@MM [McAfee], WORM_HOBBIT.B [Trend]
Type: Worm
Systems Affected: Windows


NOTE: These instructions are for all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Update the virus definitions.
  2. Run a full system scan, and delete all files that are detected as W32.Hobble.C@mm.
  3. Delete the value

    WinSrv %windir%\Shizzle.exe

    from the registry key

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
For details on how to do this, read the following instructions.

To update the virus definitions:
All virus definitions receive full quality assurance testing by Symantec Security Response before being posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
  • Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.

    Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.

To scan for and delete the infected files:
  1. Start your Symantec antivirus program, and make sure that it is configured to scan all files.
  2. Run a full system scan.
  3. If any files are detected as infected with W32.Hobble.C@mm, click Delete.

To delete the value that the worm added to the registry:

CAUTION : Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify only the keys that are specified. Read the document How to make a backup of the Windows registry for instructions.
  1. Click Start, and click Run. The Run dialog box appears.
  2. Type regedit and then click OK. The Registry Editor opens.
  3. Navigate to the key

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  4. In the right pane, delete the value

    WinSrv %windir%\Shizzle.exe
  5. Exit the Registry Editor.


Writeup By: Douglas Knowles