WORM_HOBBIT.C

Malware type: Worm

Aliases: Email-Worm.Win32.Alcaul.z (Kaspersky), W32/Hobbit.gen (McAfee), W32.Hobble@mm (Symantec), Worm/Alcau.Z (Avira), W32/Hobbit-A (Sophos),

In the wild: No

Destructive: No

Language: English

Platform: Windows

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

This Windows executable worm propagates via email using MAPI and its own SMTP engine. It also propagates via the Kazaa file-sharing network.

This worm sends email with itself as attachment to all email addresses it gathers from cached Web pages with HTML and HTM extensions and to all addresses listed in infected users Microsoft Outlook address book. It sends email with the following details:

Subject: Fwd: Scan your computer for this new virus threat...
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.
Attachment: Anti-Bug.exe

It displays the following message box after sending copies of itself via email:

WORM_HOBBIT.G upon execution, displays a message box with the text strings - KnOx Ownz System not Infected with Bugbear

This worm propagates via the Kazaa file-sharing network by creating copies itself in the following folders:

  • C:\KaZaa\My Shared Folders
  • C:\Program Files\KaZaa\My Shared Folders

Additional Notes

Certain samples of this worm contain a bug and fail to propagate via email and Kazaa. These samples were designed to send email with the following details:

Subject: files for you from <infected user's name>
Message Body: <none>
Attachment: <worm copy>

These samples display a message box with the following text:

Hobbit Worm
(c) by Energy and alco

For additional information about this threat, see:

Description created: Sep. 23, 2002 6:52:19 AM GMT -0800
Description updated: Oct. 13, 2002 12:34:58 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 23,040 Bytes (UPX Compressed)
61,440 Bytes (uncompressed)

Initial samples received on: Sep 23, 2002

Payload 1: Displays Message

Payload 2: Hides the desktop

Payload 3: Performs DoS attack on a Web site

Details:

Installation

Upon execution, this worm drops a copy of itself as SHIZZLE.EXE in the Windows folder. It then creates an autorun entry in the registry so that it executes at every Windows startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
WinSrv = "%Windows%\SHIZZLE.EXE"

*where %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.

NOTE: Certain samples of this worm contain a bug and fail to drop a copy of itself in the Windows folder and create the autorun registry entry.

This worm then drops two files in the current folder. It selects the file names for these files from the following list found in its body:

  • aCe1.theme
  • AddamsFamily.theme
  • AlexanderGrahamBellSecrets.zip
  • Anti 0190 Dialer.bat
  • Anti 0190 Dialer.exe
  • Anti 0190 Dialer.pif
  • Anti 0190 Dialer.scr
  • BackstreetBoys.theme
  • Bearshare_Fix.bat
  • Bearshare_Fix.exe
  • Bearshare_Fix.pif
  • Bearshare_Fix.scr
  • Beyond_FF11.bat
  • Beyond_FF11.exe
  • Beyond_FF11.pif
  • Beyond_FF11.scr
  • Borland Delphi 6 Key.bat
  • Borland Delphi 6 Key.exe
  • Borland Delphi 6 Key.pif
  • Borland Delphi 6 Key.scr
  • Borland Delphi(all) Crack.bat
  • Borland Delphi(all) Crack.exe
  • Borland Delphi(all) Crack.pif
  • Borland Delphi(all) Crack.scr
  • Britney Spears Nude.bat
  • Britney Spears Nude.exe
  • Britney Spears Nude.pif
  • Britney Spears Nude.scr
  • BritneySpearsNude.theme
  • ChristinaAguilera.theme
  • CIASecrets.zip
  • Claudia_Schiffer.bat
  • Claudia_Schiffer.exe
  • Claudia_Schiffer.pif
  • Claudia_Schiffer.scr
  • CounterStrikeCheats.zip
  • CourtneyCoxNude.theme
  • CplusplusUnleashed.zip
  • CreditCardNumbers.zip
  • CreditCards.zip
  • Cube Emulator.bat
  • Cube Emulator.exe
  • Cube Emulator.pif
  • Cube Emulator.scr
  • DisneyBedTimeStories.zip
  • DragonballZ.theme
  • DrNo.theme
  • Edonkey_Fix.bat
  • Edonkey_Fix.exe
  • Edonkey_Fix.pif
  • Edonkey_Fix.scr
  • Email Bomber.bat
  • Email Bomber.exe
  • Email Bomber.pif
  • Email Bomber.scr
  • EroticStories.zip
  • Final_Fantasy10.bat
  • Final_Fantasy10.exe
  • Final_Fantasy10.pif
  • Final_Fantasy10.scr
  • Flock_Update.bat
  • Flock_Update.exe
  • Flock_Update.pif
  • Flock_Update.scr
  • FTP Cracker.bat
  • FTP Cracker.exe
  • FTP Cracker.pif
  • FTP Cracker.scr
  • FullSpeed.bat
  • FullSpeed.exe
  • FullSpeed.pif
  • FullSpeed.scr
  • Goldfinger.theme
  • HackApacheServersScript.bat
  • Hackers.theme
  • HackHotmailScript.bat
  • HackIISServersScript.bat
  • Hacking101.zip
  • HackMozillaServersScript.bat
  • HackPayPalScript.bat
  • HackSQLServersScript.bat
  • HackXBoxScript.bat
  • HackYahooScript.bat
  • Hotmail Hacker Tool.bat
  • Hotmail Hacker Tool.exe
  • Hotmail Hacker Tool.pif
  • Hotmail Hacker Tool.scr
  • I-Explorer7.0.bat
  • I-Explorer7.0.exe
  • I-Explorer7.0.pif
  • I-Explorer7.0.scr
  • JamesBond.theme
  • Jenifer Lopez Naked.bat
  • Jenifer Lopez Naked.exe
  • Jenifer Lopez Naked.pif
  • Jenifer Lopez Naked.scr
  • JokeForTheDay.zip
  • Kaza_Fix.bat
  • Kaza_Fix.exe
  • Kaza_Fix.pif
  • Kaza_Fix.scr
  • Kaza_Lite_Update_Fix.bat
  • Kaza_Lite_Update_Fix.exe
  • Kaza_Lite_Update_Fix.pif
  • Kaza_Lite_Update_Fix.scr
  • kn0x.theme
  • LearnCSharp.zip
  • LearnHTML.zip
  • LearnKylix.zip
  • LearnPHP.zip
  • LearnVisualBasic.NET.zip
  • LearnVisualBasic.zip
  • LearnVisualC.zip
  • LearnVisualFoxPro.zip
  • LordoftheRings.theme
  • MakeMillions.zip
  • McAffea_KeyGen.bat
  • McAffea_KeyGen.exe
  • McAffea_KeyGen.pif
  • McAffea_KeyGen.scr
  • MichelleBranch.theme
  • Morpheus_Update_Fix.bat
  • Morpheus_Update_Fix.exe
  • Morpheus_Update_Fix.pif
  • Morpheus_Update_Fix.scr
  • New_Napster_Clone.bat
  • New_Napster_Clone.exe
  • New_Napster_Clone.pif
  • New_Napster_Clone.scr
  • NewsweekSeptemberEditionCompressed.zip
  • NicoleKidmanFuck.theme
  • NikolaTeslaNotes.zip
  • NSync.theme
  • Pamela_Live_Fucking.bat
  • Pamela_Live_Fucking.exe
  • Pamela_Live_Fucking.pif
  • Pamela_Live_Fucking.scr
  • Phreaking.zip
  • PlayboyCenterFolds.theme
  • Ps2 Crack.bat
  • Ps2 Crack.exe
  • Ps2 Crack.pif
  • Ps2 Crack.scr
  • Ps2 Emulator.bat
  • Ps2 Emulator.exe
  • Ps2 Emulator.pif
  • Ps2 Emulator.scr
  • Reboot.bat
  • Reboot.exe
  • Reboot.pif
  • Reboot.scr
  • RedirectMeToHollywood.bat
  • SamuraiX.theme
  • SecretsOfAlbertEinstein.zip
  • SecretsOfMicrosoftdotNET.zip
  • Shakira Nude.bat
  • Shakira Nude.exe
  • Shakira Nude.pif
  • Shakira Nude.scr
  • Shakira Nude.theme
  • Shrek.theme
  • StarWars.theme
  • StephenKingUnreleasedNotes.zip
  • Symantec_KeyGen.bat
  • Symantec_KeyGen.exe
  • Symantec_KeyGen.pif
  • Symantec_KeyGen.scr
  • TheHives.theme
  • ThomasEdisonSecrets.zip
  • TipsOnMakingYourPartnerWild.zip
  • TroubleshootingyourComputer.zip
  • VirusWriting.zip
  • WindowsSourceCodeRedirect.bat
  • WinMx Hack.bat
  • WinMx Hack.exe
  • WinMx Hack.pif
  • WinMx Hack.scr
  • WinXP_Crack.bat
  • WinXP_Crack.exe
  • WinXP_Crack.pif
  • WinXP_Crack.scr
  • XBox Emulator.bat
  • XBox Emulator.exe
  • XBox Emulator.pif
  • XBox Emulator.scr
  • XXX.theme
  • YouWantToBeAMillionaire.zip

Dropped files having the extensions, EXE, PIF, or SCR, are copies of this worm. Those with extensions, BAT, THEME, or ZIP, are non�malicious files that contains the following batch file commands:

@echo off
ctty nul

Mailing Routine

This worm propagates via email using MAPI and its own SMTP engine. It uses the default SMTP server stored in the following registry key:

HKEY_CURRENT_USER\Software\Microsoft\Internet Account ManagerAccounts\00000001\SMTP Server

It creates a text file named EMAIL.TXT in the current folder, which it uses as storage for all email addresses it finds on cached Web pages with HTML and HTM. It then sends email with itself as attachment to all email addresses stored in EMAIL.TXT and to all addresses listed in the infected users� Microsoft Outlook Address book. The details of the email message is as follows:

Subject: Fwd: Scan your computer for this new virus threat...
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.
Attachment: Anti-Bug.exe

Kazaa Propagation

This worm also checks for the existence of the following folders, which are typical Kazaa shared folders:

  • C:\KaZaA\My Shared Folder\
  • C:\Program Files\KaZaA\My Shared Folder\

It drops a copy of itself in these folders using any of the following 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

These copies make this worm accessible for download by other Kazaa users.

Non-working Samples

Certain samples of this worm contain a bug and fail to propagate via email and Kazaa. These samples were designed to send email with the following details:

Subject: files for you � from <infected user's name>
Message Body: <none>
Attachment: <worm copy>

Denial of Service

Working samples of this worm perform a DoS (Denial of Service) attack on the site www.dokfleed.net. To do this, it continuously sends PING requests, each containing 10,000 Bytes, to the site. This also slows down network traffic on the infected machine.

Payloads

Working samples of this worm display the following message box after executing the mass-mailing routine:

WORM_HOBBIT.G upon execution, displays a message box with the text strings - KnOx Ownz System not Infected with Bugbear

Non-working samples display a message box with the following text:

Hobbit Worm
(c) by Energy and alco

This worm downloads a non�malicious file, ZIPPY.EXE, from the following Web site:

http://www.mirror.ac.uk/sites/ftp.info-zip.org/pub/infozip/
WIN32/zip23xN.zip/zip.exe?extract=true zippy.exe

The downloaded file is actually a tool for extracting the contents of compressed files.

If it fails to download the file, it creates a zero byte (no content) file using the same name, ZIPPY.EXE, in the current folder.

This worm also creates the following registry entry to hide the Windows desktop:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
Policies\Explorer\
Desktop=dword:00000001


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 1.386.00

Pattern release date: Sep 23, 2002


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Identifying the Malware Program

Before proceeding to remove this malware, first identify the malware program.

Scan your system with Trend Micro antivirus and NOTE the path and filenames of files detected as WORM_HOBBIT.C. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro's free online virus scanner.

Terminating the Malware Program

This procedure terminates the running malware process from memory. You will need the name(s) of the file(s) detected earlier.

  1. Open Windows Task Manager.
    On Windows 9x/ME systems, press
    CTRL%20ALT%20DELETE
    On Windows NT/2000/XP systems, press
    CTRL%20SHIFT%20ESC, and click the Processes tab.
  2. In the list of running programs*, locate the malware file or files detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. Do the same for all detected malware files in the list of running processes.
  5. To check if the malware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

*NOTE: On systems running Windows 9x/ME, Task Manager may not show certain processes. You may use a third party process viewer to terminate the malware process. Otherwise, you will have to restart your machine.

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing during startup.

  1. Open Registry Editor. To do this, click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry or entries:
    WinSrv = "%Windows%\shizzle.exe"
    *where %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.
  4. Close Registry Editor.
NOTE: If you were not able to terminate the malware process from memory, as described in the previous procedure, restart your system.

Deleting Non-malicious Malware Files

  1. Locate and delete the following files in the directory where the malware was detected earlier:
    • ZIPPY.EXE
    • TEMP.THEME
    • EMAIL.TXT
  2. Refer to the list on the Technical Details section for possible file names of other non-malicious files.

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_HOBBIT.C. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro's free online virus scanner.


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