W32.Kwbot.F.Worm

1. Copies itself as %System%\Xms32.exe.
   
2. Drops the file, %System%\Xms32.tmp.exe. This file is 14,176 bytes, and Symantec antivirus products detect it as Backdoor.Sdbot.
   
   NOTE: %System% is a variable. The worm locates the System folder and copies the files 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).
   
3. Attempts to spread across the KaZaA and iMesh file-sharing networks by doing the following:
   
   NOTE: The KaZaA or iMesh software must be installed on your computer for W32.Kwbot.F.Worm to spread.
   
4. Creates the folder, %Windir%\sCache32.
   
5. Copies itself to the %Windir%\sCache32 folder as the following filenames:
   • 2 Find MP3 8.2.0.exe
   • AC3-MP3 converter.exe
   • ACDSee 5.5b.exe
   • ACDSee Classic 2.79.exe
   • Ad-aware 6.5 (new)Download Accelerator Plus 6.3.exe
   • Adobe Acrobat Reader 5.6.exe
   • Adobe PhotoShop 7.1 crack.exe
   • All Editor 3.0b.exe
   • AOL Instant Messenger 6.1.exe
   • Auction Sentry (new).exe
   • AudioLabel CD Labeler 3.0 (+crack).exe
   • Battlefied1942 Pack4 (crack+bloodpatch).exe
   • BearShare 5.1.1.exe
   • C&C Generals Pack2 (new patch).exe
   • Complete UK Music Database 4.2.exe
   • DirectDVD 4.9.exe
   • DivX Bundle 6.2.exe
   • DivX edit (new).exe
   • DivX Video Bundle 5.5.1.exe
   • DvD Rip guide (+tools) st0rm.exe
   • Dynamite Downloads.exe
   • Easy CD Creator Software Update.exe
   • FlashFXP (keygen).exe
   • FreeRip 4.30.exe
   • Genie Stream 3.2.4.exe
   • GetRight 5.5 + crack.exe
   • Global DiVX Player 2.0.1.exe
   • Gothic 2 (m-patch).exe
   • Grokster 2.0.exe
   • Hacker Tutorial (by ph3Akz).exe
   • Half-Life keygen (+ogc hack).exe
   • HL keys (working).exe
   • I.G.I. 2 (new crack).exe
   • ICQ Lite beta (b2253).exe
   • ICQ Pro 2003a beta (b4600).exe
   • iMesh 4.1 beta.exe
   • iSnipeIt 5.0c.exe
   • James Bond 007 Nightfire crack.exe
   • Kazaa Media Desktop 2.5.exe
   • Kazaa Skins 1.8.exe
   • KaZooM MP3 Kazaa Accelerator 2.5.exe
   • Medal Of Honor (Allied Assault) crack.exe
   • Microangelo 6.0b.exe
   • mIRC 6.x addon patch.exe
   • mIRC s3th war-script.exe
   • Morpheus 2.6.exe
   • MP3 cut pro 3.0.exe
   • MSN Messenger 5.5.10.exe
   • Need for Speed 6 (new cars + crack).exe
   • NeoNapster 3.92.exe
   • Nero Burning ROM 5.8.2.4.exe
   • Network Cable + ADSL Speed 2.0 (beta).exe
   • New Nvidia (geForce) drivers (beta).exe
   • Nimo Codec Pack 9.0 (stable).exe
   • Nvidia Detonator XP Drivers (Windows XP/2000).exe
   • Operation Flashpoint (bloopatch).exe
   • Patch Creator 3.5a.exe
   • PhotoShow 3.1.exe
   • Pop-Up Stopper 4.0 (beta).exe
   • Ps2 to Pc tutorial (+tool).exe
   • QuickTime 7.2 (new).exe
   • Raven Shield 5.32 crack.exe
   • RealJukebox Basic 2.8.exe
   • RealOne Free Player 2.8.exe
   • RemoteSpy 1.5.exe
   • Sim City 4 crack.exe
   • Splinter Cell crack.exe
   • TitJiggle (flash game).exe
   • Trillian 0.8 + plugins.exe
   • UniversalFlood (4.8b).exe
   • Unreal2 (2.8) crack.exe
   • UT2003 multi-crack (new).exe
   • Warcraft3 battle.net(2.5) crack.exe
   • Window Washer 4.8.exe
   • WinMX 3.5.1.exe
   • WinRAR 3.8.exe
   • WinZip 8.3b (crack).exe
   • WinZip 9.0 SR-1.exe
   • Wippit 2.1 (beta).exe
   • WS_FTP LE 6.0.exe
   • XViD bundle (codec+tutorial).exe
     
     
6. Adds the values:
   
   "Dir? 012345:"="%Windir%\sCache32"
   "DisableSharing"="0"
   
   NOTE: "?" in these values represents a number that the worm has chosen.
   
   to these registry keys:
   
   HKEY_CURRENT_USER\Software\Kazaa\LocalContent
   HKEY_CURRENT_USER\Software\iMesh\Client\LocalContent
   
   so that other KaZaA or iMesh users may download the files from the %Windir%\sCache32 folder.
   

1. Copies itself as %System%\System32.exe.
   
2. Creates the value:
   
   "Shell"="Explorer.exe %system%\System32.exe"
   
   in the registry key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
   
3. Waits for an Internet connection. When the Trojan detects a connection, it connects to a specific IRC server using port 6667, joins a specific channel, and notifies a hacker by sending them a private message.
   
4. Waits for commands that the hacker transmits using IRC. The commands allow the hacker to perform any of the following actions:
   • Deliver system and network information to the hacker.
   • Manage the self installation.
   • Download and execute files.
   • Perform Denial of Service (DoS) attacks.
   • Replicate across file-sharing networks, such as KaZaA and iMesh.

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.