W32.HLLW.Indor.B@mm

Printer Friendly Page

Discovered: January 23, 2003
Updated: February 13, 2007 11:50:10 AM
Type: Worm
Systems Affected: Windows


W32.HLLW.Indor.B@mm is a mass-mailing worm that uses Microsoft Outlook to send a zipped copy of itself to all the contacts in the Microsoft Outlook Address Book. When W32.HLLW.Indor.B@mm runs, it displays a fake message, stating "Error in file #1: bad Zip file offset (Error local header signature not found): disk #1 offset: 68669733"

W32.HLLW.Indor.B@mm can also spread through network drives, floppy disks, the KaZaA file-sharing network, and mIRC.

The email has the following characteristics:

Subject: The subject line is one of the following:

  • Your verification is required Confirm FFA submission and receive 1000 Credit
  • Your Success Is Guranteed!
  • You are Losing Income
  • WHY NOT CHECK IT OUT? IT'S FREE!
  • Free Software, Download it now !!
  • Free MP3, OGG/VORBIS Hit Songs !!
  • Download DVD Movie Now !! Its Free..!
  • URGENT: Please Verify Your Submission Confirm FFA submission !!
  • The E.A.S.E System Can Make You Money At Home!!
  • Thank You !
  • Re: Your Daily Report
  • Re: Web Site Report
  • WE send the TRAFFIC, YOU make the SALES!
  • Thank You For Your Subscription - Confirmation
  • Need a quick $100 today?
  • Confirmation Email - Required !

Attachment: The attachment, which is a zipped copy of the worm, is one of the following:
  • SaveNow.zip
  • Report.zip
  • Bonus.zip
  • FFA.zip
  • FreeJoin.zip

This threat is written in the Microsoft Visual Basic programming language and is compressed with UPX.

Antivirus Protection Dates

  • Initial Rapid Release version January 24, 2003
  • Latest Rapid Release version January 24, 2003
  • Initial Daily Certified version January 24, 2003
  • Latest Daily Certified version January 24, 2003
  • Initial Weekly Certified release date January 29, 2003

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

Writeup By: Yana Liu

Discovered: January 23, 2003
Updated: February 13, 2007 11:50:10 AM
Type: Worm
Systems Affected: Windows


When W32.HLLW.Indor.B@mm runs, it does the following:

  1. Displays this fake message:


  2. Copies itself as:
    • C:\%Windir%\Blank.scr
    • C:\%Windir%\Kernelw32.exe

      NOTE: %Windir% is a variable. The worm locates the Windows installation folder and copies itself to that location. By default, this is C:\Windows or C:\Winnt.
  3. Adds the value:

    Kernelw C:\%Windir%\Kernelw32.exe

    to the registry key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices

    so that the worm runs when you start Windows.
  4. Modifies the C:\Windows\Win.ini file as follows:
    • In the [windows] section, the worm adds the line:

      load=C:\%windir%\Kernelw32.exe

      so that it runs when you start Windows 95/98/Me.
    • Inserts the text:

      [WORM]
      Name=I-WORM>PERKASA
      Author=Iwing/Indovirus
  5. Modifies the [boot] section of the C:\Windows\System.ini file, by adding the line:

    SCRNSAVE.EXE=C:\%windir%\Blank.scr

    so that the worm runs when you start Windows 95/98/Me.
  6. Searches all the folders and subfolders for files that have the extensions .exe or .jpg. If the worm finds any, it copies itself to the same folder, using the same file name that it finds, plus .scr as the second extension.

    For example, if the worm finds C:\Windows\Calc.exe, it copies itself as C:\Windows\Calc.exe.scr.
  7. Searches all the folders and subfolders for files that have the extensions .lnk, .doc, .xls, .mp3, .mpg, .htm, or .html. If the worm finds any, it copies itself to the same folder, using the same file name that it finds, plus .exe as the second extension.
  8. Tries to kill these processes:
    • Antivir
    • Avp.exe
    • Avp32
    • Amon.exe
    • Avpcc.exe
    • Avpm.exe
    • Pop3trap
    • Avconsol
    • Vshwin32
    • Vsstat
    • Nmain
    • Navapw32
  9. Deletes any of the following files from all the folders and subfolders:
    • Antivir.exe
    • Avp.exe
    • Avp32.exe
    • Amon.exe
    • Avpcc.exe
    • Avpm.exe
    • Pop3trap.exe
    • Avconsol.exe
    • Vshwin32.exe
    • Vsstat.exe
    • Nmain.exe
    • Lucomserver.exe
    • Avpdos32.exe
    • Avp.set
  10. Launches your Web browser to www.indovirus.net. The worm attempts to flood www.sarc.com.
  11. If the current system date is the 8th or 12th of any month, the worm displays this message:

    WARNING!
    The System is either busy or has become unstable you can wait and see if it becomes available again, or you can restart your Computer

    * Press Any key to return to windows and wait

    * Press CTRL+ALT+DEL Again to restart your computer,you will lose unsaved information,in any programs thats are runing.

    * Send Complain Email to support@microsoft.com for creating This Stupid Message.

How W32.HLLW.Indor.B@mm spreads
W32.HLLW.Indor.B@mm uses multiple methods to attempt to spread itself, such as:
  1. Floppy disk
  2. KaZaA file-sharing network
  3. Mapped drives
  4. Email
  5. mIRC

Each of these methods is discussed next.

1. Floppy disk
If a floppy disk is in the floppy disk drive, the worm copies itself as one of the following:
  • A:\Asian*.jpg.scr
  • A:\Lesbians*.jpg.scr
  • A:\teen*.jpg.scr
  • A:\Fetish*.jpg.scr
  • A:\Blowjobs*.jpg.scr

NOTE: * represents a number that the worm randomly generates. For example, the file name may be A:\Lesbian876.jpg.scr.


2. KaZaA file-sharing network
If you have KaZaA installed, the worm copies itself to one of these folders:
  • C:\Program Files\KaZaA\My shared folder
  • C:\KaZaA\My shared folder

as these files:
  • Antiviral.exe
  • Avupdate.exe
  • Free_firewall.exe
  • Liveupdate.exe
  • Mcaff.exe
  • Navupdate.exe
  • Password.exe
  • Sexshow.exe
  • Xppatch.exe

And, the worm creates file names constructed from these strings:
  • AMATEURE
  • ASIAN
  • Fetish
  • Fisting
  • Girls
  • Lolita
  • NUDE
  • PIC
  • Preeteens
  • SEXY

followed by a randomly generated number, plus jpg.exe

For example, the file name can be Fisting370683332jpg.exe.


3. Mapped drives
The worm inventories all the network drives and copies itself to the \Windows folder of each drive that it finds, as one of these files:
  • Wet_And_Horny.jpg.exe
  • Hot_And_Horny.jpg.exe
  • SexyGirls.jpg.exe
  • Asian.jpg.exe
  • Lesbians.jpg.exe


4. Email
The worm creates the following files:
  • C:\Zip.com, which is a copy of the legitimate program file, Pkzip.exe.
  • C:\Zip.dbg, which is a data file that the worm uses to create C:\Zip.com. This file is 143,524 bytes in length.
  • C:\Zipb.bat, which the worm uses to create C:\Zip.com.

NOTE: These three files are not viral by themselves. Therefore, Symantec antivirus products do not detect them. If you find any of these files, manually deleted them.

The worm uses Microsoft Outlook to send a zipped copy of itself to all the contacts in the Microsoft Outlook Address Book. The email has the following characteristics:

Subject: The subject line is one of the following:
  • Your verification is required Confirm FFA submission and receive 1000 Credit
  • Your Success Is Guranteed!
  • You are Losing Income
  • WHY NOT CHECK IT OUT? IT'S FREE!
  • Free Software, Download it now !!
  • Free MP3, OGG/VORBIS Hit Songs !!
  • Download DVD Movie Now !! Its Free..!
  • URGENT: Please Verify Your Submission Confirm FFA submission !!
  • The E.A.S.E System Can Make You Money At Home!!
  • Thank You !
  • Re: Your Daily Report
  • Re: Web Site Report
  • WE send the TRAFFIC, YOU make the SALES!
  • Thank You For Your Subscription - Confirmation
  • Need a quick $100 today?
  • Confirmation Email - Required !

Message: The message body is one of the following:
  • Hello!
    Need a quick $100 today?
    Need a quick $500 this week?
    Need to QUICKLY build a $5,000 monthly income?

    Download the attachment now !
  • Have I peaked your curiosity?
    This is something that I think that anyone who is serious about marketing andbeing on the internet should check out.
    Save it Now !
  • SPECIAL, SPECIAL ! SANTA CAME EARLY... WE WILL REFUND YOUR MONEY IF
    YOU ARE AMONG THE NEXT 100 people to join, commit and bring
    you new people!
    Save it Now!
  • The Mastercard Stored Value Card is good anywhere in the world that Mastercard is accepted! APPLY NOW AND GET $20 FREE!!
    Download it Now And Get free Bonus!
  • ATTENTION: THIS PROGRAM IS EXPLODING WORLDWIDE. THOUSANDS OF PEOPLE ARE
    SIGNING UP EVERY DAY CREATING ONE OF THE LARGEST MEMBERSHIP BASES IN THE
    WORLD!

Attachment: The attachment, which is a zipped copy of the worm, is one of the following:
  • SaveNow.zip
  • Report.zip
  • Bonus.zip
  • FFA.zip
  • FreeJoin.zip

If you unzip the attachment, the unzipped file will be one of the following:
  • Free.exe
  • JoinNow.exe
  • FreeJoin.exe
  • FFAMember.exe
  • Bonus.exe
  • Sexy.exe
  • Girls.exe
  • SaveNow.exe
  • Report.exe
  • ItsFree.exe


5. mIRC
The worm creates an mIRC.ini file to send a zipped copy of itself, as Freepic.zip, to other mIRC users who connect to the same channel as the compromised computer.

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: Yana Liu

Discovered: January 23, 2003
Updated: February 13, 2007 11:50:10 AM
Type: Worm
Systems Affected: Windows


NOTES:

  • These instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
  • If the worm has already run and succeeded in deleting your Symantec antivirus product, you will not be able to completely remove the worm until you re-install the antivirus software. See the NOTES within the detailed steps for additional information.
  1. Update the virus definitions.
  2. Run a full system scan and delete all the files detected as W32.HLLW.Indor.B@mm.
  3. Remove the value that the worm added to the registry.
  4. Windows 95/98/Me: Remove the lines added by the worm from Win.ini and System.ini.

For specific details on each of these procedures, read the following instructions.


1. Updating the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain the virus definitions. These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate), in the "Protection" section, at the top of this writeup.
  • Downloading the definitions using the Intelligent Updater. The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater), in the "Protection" section, at the top of this writeup.

    The 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.
    NOTE: If you cannot start your Symantec antivirus program to run LiveUpdate, the worm may have damaged or deleted it. In this case, follow these alternate steps:
    1. Restart the computer in Safe mode. All the Windows 32-bit operating systems, except Windows NT, can be restarted in Safe mode. For instructions on how to do this, read the document, "How to start the computer in Safe Mode."
    2. Follow the instructions in Section 3 (and Section 4 if you are running Windows 95/98/Me).
    3. Restart the computer in normal mode.
    4. Follow the instructions in Sections 1 and 2 to complete the removal.

2. Scanning for and deleting the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected as infected with W32.HLLW.Indor.B@mm, click Delete.

3. Removing 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 the specified keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start, and then click Run. (The Run dialog box appears.)
  2. Type regedit and then click OK. (The Registry Editor opens.)
  3. Navigate to the following key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

    NOTE: This key may not exist on all the operating systems.
  4. In the right pane, delete the value:

    Kernelw C:\%windir%\Kernelw32.exe
  5. Click Registry, and then click Exit.

4. Windows 95/98/Me: Removing the lines that the worm added to the Win.ini and System.ini.

Note for Windows Me users only: Due to the file-protection process in Windows Me, a backup copy of Win.ini exists in the C:\Windows\Recent folder. Symantec recommends that you delete this file before continuing with the steps in this section. To do this using Windows Explorer, go to C:\Windows\Recent, and in the right pane select the Win.ini file and delete it. The Win.ini file will be recreated in C:\Windows\Recent when you save your changes to Win.ini in C:\Windows.
  1. Click Start, and then click Run.
  2. Type the following:

    edit c:\windows\win.ini

    and then click OK.

    (The MS-DOS Editor opens.)

    NOTE: If Windows is installed in a different location, make the appropriate path substitution.
  3. In the [windows] section of the file, look for an entry similar to:

    load=C:\%windir%\Kernelw32.exe
  4. Select the entire line. Be sure that you have not selected any other text, and then press Delete.
  5. Click File, and then click Save.
  6. Click File, and then click Exit.
  7. Type the following:

    edit c:\windows\system.ini

    and then click OK.
  8. In the [boot] section of the file, look for the line:

    SCRNSAVE.EXE=C:\%windir%\Blank.scr

    Delete this line if you find it.
  9. Click File, and then click Save.
  10. Click File, and then click Exit.



Writeup By: Yana Liu