W32.HLLW.Shydy

SUMMARY

W32.HLLW.Shydy is a worm that attempts to spread through the KaZaA file-sharing network.

The worm is written in Microsoft Visual Basic, version 6, and is packed with UPX. The VB run-time libraries must be installed for it to execute.

Protection

• Virus Definitions (LiveUpdate™ Weekly) April 16, 2003
• Virus Definitions (Intelligent Updater) April 16, 2003

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Easy

Damage

• Damage Level: Low

Distribution

• Distribution Level: Low

TECHNICAL DETAILS

When the worm is executed, it does the following:

1. Creates the subfolder Cmd32 in the same folder as the worm.
   
   
2. Copies itself as the following files:
   • Acrobat Reader WORKING crack.exe
   • Ad aware full WORKING.exe
   • Age of Empires 2 WORKING crack.exe
   • Amazing sex strip game.exe
   • AquaNox2 WORKING crack.exe
   • BabeFest 2003 ScreenSaver 1.6.exe
   • Battlefield 1942 WORKING keygen.exe
   • Battlefield1942 WORKING crack.exe
   • Black and white WORKING crack.exe
   • Black Hawk Down WORKING crack.exe
   • Business Card Designer Plus 7.91.exe
   • C&C Generals WORKING Crack.exe
   • Cable internet auto WORKING uncapper.exe
   • Clone CD 5.0.0.4 crack.exe
   • Devastation WORKING crack.exe
   • Diablo 2 WORKING crack.exe
   • Download Accelerator Plus 6.4.exe
   • DVD Copy Plus v5.1.exe
   • FIFA 2003 WORKING crack.exe
   • Final Fantasy VII XP Patch 2.0.exe
   • Flash Mx WORKING crack.exe
   • Flight Simulator 2002 WORKING crack.exe
   • Free Ram XP Pro 2.0.exe
   • Getright 5 WORKING keygen v2.exe
   • Getright All Versions WORKING keygen.exe
   • Ghost recon WORKING crack.exe
   • Global DiVX Player 3.3.exe
   • GTA 3 WORKING crack.exe
   • Hitman 2 no cd WORKING crack v2.exe
   • Hot Babes XXX WORKING Screen Saver v2.exe
   • Internet Speedup.exe
   • KaZaa cheater WORKING.exe
   • Kazaa hack 3.6 WORKING.exe
   • Kazaa Lite cheater WORKING.exe
   • Kazaa Lite New WORKING.exe
   • Kazaa speedup 3.6.exe
   • Lesbian screensaver.exe
   • Links 2003 Golf game WORKING crack.exe
   • Mafia WORKING Crack.exe
   • Master of Orion 3 crack WORKING.exe
   • Matrix WORKING Screensaver.exe
   • Metal Gear Solid 2 WORKING crack.exe
   • Mirc WORKING keygen.exe
   • MVP Baseball 2003 WORKING crack.exe
   • Need for speed 4 WORKING crack.exe
   • Need for speed 6 WORKING crack.exe
   • NFS 6 WORKING crack.exe
   • NHL 2003 WORKING crack.exe
   • NOLF WORKING crack.exe
   • Paltalk 5.04b.exe
   • Pamera screensaver.exe
   • Paradise 2 hentai anime.exe
   • Paradise 2 WORKING.exe
   • Paradise Heights WORKING.exe
   • Popup stopper 3.6.exe
   • Praetorians WORKING.exe
   • PS2 hack.exe
   • Quicktime 6 Pro WORKING keygen.exe
   • Quicktime Pro WORKING crack.exe
   • Raven Shield WORKING crack.exe
   • Serials 2003 v9.0 WORKING full.exe
   • Splinter Cell WORKING crack.exe
   • Starcraft WORKING crack.exe
   • System optimizer PRO WORKING.exe
   • The Sims WORKING crack.exe
   • Tiger Woods 2003 WORKING crack.exe
   • Trillian Pro All Versions WORKING keygen.exe
   • TweakAll 3.9.exe
   • TweakXP WORKING keygen.exe
   • Unreal II The Awakening WORKING.exe
   • Unreal2 WORKING bloodpatch v2.exe
   • UT2003 no cd crack v2.exe
   • UT2003 WORKING keygen v2.exe
   • VirtuaGirl Duo - Naughty Games.exe
   • VirtuaGirl Estelle - WORKING Sexy Vamp_full.exe
   • VirtuaGirl Victoria-TEENAGE WORKING GIRL_full.exe
   • Virtual Girl All Girls WORKING.exe
   • virtual girl full WORKING.exe
   • virtual girl sasch_full WORKING.exe
   • virtual girl WORKING.exe
   • Warcraft 3 WORKING crack.exe
   • Warcraft III WORKING crack.exe
   • Windowblinds all versions crack.exe
   • Winzip 9.0b.exe
   • Winzip WORKING keygen.exe
     
     
3. Attempts to add the values:
   
   "Dir0 012345:"="%cmd32%"
   "DisableSharing"="0"
   
   to the registry key:
   
   HKEY_CURRENT_USERSoftwareKazaaLocalContent
   
   
4. Attempts to add the values:
   
   "UploadBandwidth"="0"
   "ConcurrentUploads"="0"
   
   to the registry key:
   
   HKEY_CURRENT_USERSoftwareKazaaTransfer

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

The following instructions pertain to 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 the files detected as W32.HLLW.Shydy.
3. Delete the values that were added to the registry.
   

For specific details on each of these steps, 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 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).
• 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).
  
  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.

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.
   • For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files."
   • For Symantec AntiVirus Enterprise products: Read the document, "How to verify that a Symantec Corporate antivirus product is set to scan All Files."
2. Run a full system scan.
3. If any files are detected as infected with W32.HLLW.Shydy, click Delete.

3. Deleting the values from the registry

NOTE: This step is necessary only if you use KaZaA.

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
   
   Then click OK. (The Registry Editor opens.)
   
3. Navigate to the key:
   
   HKEY_CURRENT_USERSoftwareKazaaLocalContent
   
4. In the right pane, delete the values:
   
   "Dir0 012345:"="%cmd32%"
   "DisableSharing"="0"
   
   to the registry key:
   
   HKEY_CURRENT_USERSoftwareKazaaLocalContent
   
5. Navigate to the key:
   
   HKEY_CURRENT_USERSoftwareKazaaTransfer
   
6. In the right pane, delete the values:
   
   "UploadBandwidth"="0"
   "ConcurrentUploads"="0"
   
7. Exit the Registry Editor.