W32.HLLW.Caspid

Risk Level 1: Very Low

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Discovered: September 11, 2003

Updated: February 13, 2007 12:07:11 PM

Type: Worm, Virus

Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

W32.HLLW.Caspid performs the following actions:

The first time this worm executes, it displays a message box containing the text "Por Cristo he sido salvado:"
Copies itself as:
- %Windir%\Capside.exe
- %Windir%\CapsideRed.pif
- %System%\<random filename>.scr
  
  Notes:
  %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.
  
  %System% is a variable. The worm locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
Creates the following html files, which contain a MIME-encoded copy of the executable:
- %Windir%\Capside.htm
- %Windir%\CapsideCode.htm
- %CommonProgramFiles%\Microsoft Shared\Stationery\Capside.htm
Adds the value:

"W32Load"="%System%\<random filename>.scr"

to the registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Runso that the worm runs when you start Windows.
Modifies the Win.ini file as follows:

[windows] run=%Windows%\CapsideRed.pif

NOTE: %Windows% 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.
Modifies the System.ini file as follows:

[boot]
shell=Explorer.exe %Windows%\Capside.exe
Attempts to set itself as the default stationery that is used to create email messages. It does this by modifying registry keys as follows:
- Sets the values:
  
  Stationery Name = "%Windows%\Capside.htm"
  Wide Stationery Name = "%Windows%\Capside.htm"
  in the registry key:
  
  HKEY_CURRENT_USER\Identities\[Default Use ID]\Software\Microsoft\Outlook Express\[Outlook Version].0\Mail
- Sets the value:
  
  NewStationery = Capside
  
  in the registry key:
  HKEY_CURRENT_USER\Software\Microsoft\Office\[Version].0\Common\MailSettings
- Sets the value:
  
  001e0360 = Capside
  
  in the registry keys:
  
  HKEY_CURRENT_USER\Software\Microsoft\Windows Messaging Subsystem\Profiles\Microsoft Outlook\0a0d020000000000c000000000000046
  HKEY_CURRENT_USER\Software\Microsoft\Windows Messaging Subsystem\Profiles\Microsoft Outlook Internet Settings\0a0d020000000000c000000000000046
  HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\ Windows Messaging Subsystem\Profiles\Microsoft Outlook\0a0d020000000000c000000000000046
  HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\ Windows Messaging Subsystem\Profiles\Microsoft Outlook Internet Settings\0a0d020000000000c000000000000046
Spreads through file-sharing networks by copying itself in encoded HTML form to the shared folders, which the following applications use:
- BearShare
- eDonkey
- ICQ
- Filetopia
- FileNavigator
- Gnucleus
- Grokster
- iMesh
- Kazaa
- Morpheus
- LimeWire
- Overnet
- Soulseek
  
  And to the hard-coded path:
- C:\My Downloads
  
  it uses the following filenames:
- ACDSee 5.5.html
- Age of Empires 2 crack.html
- Ana Kournikova Sex Video.html
- Animated Screen 7.0b.html
- aol cracker.html
- AOL Instant Messenger.html
- aol password cracker.html
- AquaNox2 Crack.html
- Audiograbber 2.05.html
- AVP Antivirus Pro Key Crack.html
- BabeFest 2003 ScreenSaver 1.5.html
- Babylon 3.50b reg_crack.html
- Battlefield1942_bloodpatch.html
- Battlefield1942_keygen.html
- Britney Spears Sex Video.html
- Buffy Vampire Slayer Movie.html
- Business Card Designer Plus 7.9.html
- cable modem ultility pack.html
- Clone CD 5.0.0.3 (crack).html
- Clone CD 5.0.0.3.html
- Coffee Cup Free HTML 7.0b.html
- Cool Edit Pro v2.55.html
- counter-strike.html
- Crack Passwords Mail.html
- Credit Card Numbers generator(incl Visa,MasterCard,...).html
- Cristina Aguilera Sex Video.html
- delphi.html
- Diablo 2 Crack.html
- DirectDVD 5.0.html
- DirectX Buster (all versions).html
- DirectX InfoTool.html
- divx pro.html
- DivX Video Bundle 6.5.html
- divx_pro.html
- Download Accelerator Plus 6.1.html
- DVD Copy Plus v5.0.html
- DVD Region-Free 2.3.html
- Edonkey2000-Speed me up scotty.html
- FIFA2003 crack.html
- Final Fantasy VII XP Patch 1.5.html
- Flash MX crack (trial).html
- FlashGet 1.5.html
- FreeRAM XP Pro 1.9.html
- Game Cube Real Emulator.html
- GetRight 5.0a.html
- Global DiVX Player 3.0.html
- Gothic2 licence.html
- GTA 3 Crack.html
- GTA 3 Serial.html
- Guitar Chords Library 5.5.html
- Hentai Anime Girls Movie.html
- Hitman_2_no_cd_crack.html
- Hot Babes XXX Screen Saver.html
- HotGirls.html
- Hotmail Hacker 2003-Xss Exploit.html
- hotmail_hack.html
- ICQ Pro 2003a.html
- ICQ Pro 2003b (new beta).html
- iMesh 3.6.html
- iMesh 3.7b (beta).html
- IrfanView 4.5.html
- Jenifer Lopez Sex Video.html
- KaZaA Hack 2.5.0.html
- Kazaa SDK + Xbit speedUp for 2.xx.html
- KaZaA Speedup 3.6.html
- Links 2003 Golf game (crack).html
- Living Waterfalls 1.3.html
- macromedia dreamweaver key generator.htm
- Mafia_crack.html
- Matrix Movie.html
- Matrix Screensaver 1.5.html
- Mcafee Antivirus Scan Crack.html
- MediaPlayer Update.html
- Microsoft KeyGenerator-Allmost all microsoft stuff.html
- mIRC 6.40.html
- mp3Trim PRO 2.5.html
- MSN Messenger 5.2.html
- NBA2003_crack.html
- Need 4 Speed crack.html
- Nero Burning ROM crack.html
- Netbios Nuker 2003.html
- Netfast 1.8.html
- Network Cable e ADSL Speed 2.0.5.html
- NHL 2003 crack.html
- Nimo CodecPack (new) 8.0.html
- Norton Anvirus Key Crack.html
- PalTalk 5.01b.html
- pamela_anderson.htm
- Panda Antivirus Titanium Crack.html
- play station emulator.html
- Pop-Up Stopper 3.5.html
- Popup Defender 6.5.html
- PS2 PlayStation Simulator.html
- Quick Time Key Crack.html
- QuickTime_Pro_Crack.html
- Sakura Card Captor Movie.html
- Screen saver christina aguilera naked.html
- Screen saver christina aguilera.html
- Security-2003-Update.html
- Serials 2003 v.8.0 Full.html
- serials2000.html
- Sex Live Simulator.html
- Sex Passwords.html
- SmartFTP 2.0.0.html
- SmartRipper v2.7.html
- Space Invaders 1978.html
- Spiderman Movie.html
- Splinter_Cell_Crack.html
- Starcraft serial.html
- Start Wars Trilogy Movies.html
- Steinberg_WaveLab_5_crack.html
- Stripping MP3 dancer+crack.html
- subseven.html
- Thalia Sex Video.html
- Trillian 0.85 (free).html
- TweakAll 3.8.html
- Unreal2_bloodpatch.html
- Unreal2_crack.html
- UT2003_bloodpatch.html
- UT2003_keygen.html
- UT2003_no cd (crack).html
- UT2003_patch.html
- VB6.html
- Virtua Girl (Full).html
- virtua girl - adriana.plg
- virtua girl - bailey short skirt.plg
- VirtualSex.html
- Visual Basic 6.0 Msdn Plugin.html
- Visual basic 6.html
- warcraft 3 crack.html
- warcraft 3 serials.plg
- WarCraft_3_crack.html
- Winamp 3.8.html
- winamp plugin pack.html
- WindowBlinds 4.0.html
- Windows XP complete + serial.html
- Windows Xp Exploit.html
- WinOnCD 4 PE_crack.html
- WinRar 3.xx Password Cracker.html
- WinZip 9.0b.html
- winzip full version key generator.htm
- Winzip KeyGenerator Crack.html
- WinZipped Visual C++ Tutorial.html
- XNuker 2003 2.93b.html
- Yahoo Messenger 6.0.html
- Zelda Classic 2.00.html
Searches the Windows folder for any file that has an htm or html extension, recursively processing subfolders. The worm infects every such file it finds, encrypting the host file and infecting it with an encoded version of the worm executable.

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: Heather Shannon

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