W32.HLLW.Lama.C

SUMMARY

Win32.HLLW.Lama.C is a simple mass-mailing worm that uses Microsoft Outlook to send itself to all contacts in the Microsoft Outlook Address Book. It may also spread through mIRC and KaZaA shared folders. The email message has the following characteristics:

Subject: Mira Lo Que Compre Aller!!
Message:
Hola! Mira Lo Que CAompre Aller!!                                                                
Es Un Lorito jjeje Se LLama Miniqiu Aqui Te mando Un Screen Saver Que Hice De El!"
Attachment: Miniqiu.scr

NOTE: Definitions dated before August 27, 2002, may detect this threat as W32.Niqim.

Protection

• Virus Definitions (LiveUpdate™ Weekly) July 24, 2002
• Virus Definitions (Intelligent Updater) July 22, 2002

TECHNICAL DETAILS

When Win32.HLLW.Lama.C runs, it does the following:

It copies itself as:

• C:\%windir%Miniqiu.scr
• C:\%windir% est sexi.scr
• C:\%windir%Cloud Strife.scr
• C:\%windir%Lorena.scr
• C:\%windir%HOKO.scr
• C:\%windir%RaZor.scr
• A:Pamela Anderson.scr
• C:Program FilesKaZaAMy Shared FolderPamela Anderson.scr
• C:Program FilesKaZaAMy Shared FolderShakira.scr
• C:Program FilesKaZaAMy Shared FolderPlayboy Session 2002.scr
• C:Program FilesICQshared filesICQ New Version 2003.exe
• C:Program FilesICQshared filesICQ Gold Edition 2002.exe
• C:Program FilesICQshared filesICQ AntiVirus.exe
• C:Program FilesICQshared filesICQ Millenium Edition.exe

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

It deletes the following files if they exist:

• C:Archiv~1PeravPav.dll
• C:Archiv~1PeravPer.dll
• C:Program FilesPeravPav.dll
• C:Program FilesPeravPer.dll
• C:BasesAvp.Set
• C:SystemVshield.vxd
• C:System32Vshield.vxd
• C:Vshield.vxd
• C:Archivos de programasNorton AntiVirusNAVDX.EXE
• C:Archivos de programasNorton AntiVirusV325SCAN.dll
• C:Archivos de programasNorton AntiVirusNAVP.VXD

It creates the Visual Basic script (VBS) file named C:Miniqiu.vbs. The worm sends itself to all contacts in the Microsoft Outlook Address Book by using this VBS file. The email message has the following characteristics,

Subject: Mira Lo Que Compre Aller!!
Message:
Hola! Mira Lo Que CAompre Aller!!                                                                
Es Un Lorito jjeje Se LLama Miniqiu Aqui Te mando Un Screen Saver Que Hice De El!"
Attachments: Miniqiu.scr

It overwrites the Script.ini file that exists in any of these folders:

• C:Mirc
• C:Mirc32
• C:Program FilesMirc
• C:Program FilesMirc32

Using the overwritten file, it may use mIRC to send mIRC users a copy of itself as Test sexi.scr.

The worm creates the subkey

Miniqiu_sent

under the registry key

HKEY_CURRENT_USERSoftware

and set its value to yea so that the worm will not send itself again.

The worm searches for the AVP installation folder and deletes BasesAvp.set from that folder. It changes the Value Data of the registry key

HKEY_LOCAL_MACHINESOFTWAREKasperskyLabSharedFilesFolder

to

jodeteAVP

The worm adds these values:

Miniqiu C:\%windir%Miniqiu.scr
C:\%windir%Miniqiu.scr ""

to the registry key

HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun

so that it runs each time that you start Windows.

It overwrites the C:Autoexec.bat file so that when you reboot the computer (Windows 95/98/Me only), the worm displays the following message and then formats drives C and D:

Soy Miniqiu Soy Un Periquito Maligno!!, Te Comere Y Luego Escupire Todos Tus Huesos!!!!

Recommendations

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

• Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
• If a blended 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 (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
• 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.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate infected computers quickly to prevent further compromising your organization. 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.

REMOVAL

CAUTION: If your computer is infected with Win32.HLLW.Lama.C and you are running Windows 95/98/Me, do not restart the computer until you have completed the removal instructions, especially the deletion of the lines from the Autoexec.bat file.

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, run a full system scan, and delete all files that are detected as Win32.HLLW.Lama.C.
2. Delete the values
   
   Miniqiu C:\%windir%Miniqiu.scr
   C:\%windir%Miniqiu.scr ""
   
   from the registry key
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   
3. Delete the value
   
   Miniqiu_sent yea
   
   from the registry key
   
   HKEY_CURRENT_USERSoftware
   
4. Reset the data in the registry key
   
   HKEY_LOCAL_MACHINESOFTWAREKasperskyLabSharedFilesFolder
   
   to the AVP installation folder. For example, it may be
   
   C:Program FilesCommom FilesAVP shared
   
5. (Windows 95/98/Me only) Remove the text that the worm added to the Autoexec.bat file.

For details on how to do this, read the following instructions.

To scan for and delete the infected files:

1. Obtain the most recent virus definitions. There are two ways to do this:
   • Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and 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 have undergone full quality assurance testing by Symantec Security Response. They 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.
     
2. Start your Symantec antivirus program, and make sure that it is configured to scan all files.
   • Norton AntiVirus Consumer products: Read the document How to configure Norton AntiVirus to scan all files.
   • Symantec Enterprise antivirus products: Read the document How to verify a Symantec Corporate antivirus product is set to scan All Files.
3. Run a full system scan.
4. If any files are detected as infected by Win32.HLLW.Lama.C, click Delete.

To delete the values 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_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   
4. In the right pane, delete the values
   
   Miniqiu C:\%windir%Miniqiu.scr
   C:\%windir%Miniqiu.scr ""
   
5. Navigate to the key
   
   HKEY_CURRENT_USERSoftware
   
6. In the right pane, delete the value
   
   Miniqiu_sent yea
   
7. Navigate to the key
   
   HKEY_LOCAL_MACHINESOFTWAREKasperskyLabSharedFiles
   
8. In the right pane, reset the data of the value Folder to AVP installation folder, for example, to
   
   C:Program FilesCommom FilesAVP shared
   
9. Exit the Registry Editor.

To remove the text that the worm added to the Autoexec.bat file:
This is necessary only on computers that are running Windows 95/98/Me.

NOTE: (For Windows Me users only) Due to the file-protection process in Windows Me, a backup copy of the file that you are about to edit exists in the C:WindowsRecent folder. Symantec recommends that you delete this file before you continue with the steps in this section. To do this using Windows Explorer, go to C:WindowsRecent, and in the right pane select the Win.ini file and delete it. It will be regenerated as a copy of the file that you are about to edit when you save your changes to that file.

1. Click Start, and click Run.
2. Type the following, and then click OK.
   
   edit c:autoexec.bat
   
   The MS-DOS Editor opens.
   
3. Look for a line similar to the following:
   
   format c:
   
4. If the line exists, it is likely that the worm succeeded in overwriting this file. In this, case, select all text in this file and delete it. Then replace the file from a clean backup.
5. Click File, and click Save.
6. Click File, and click Exit.