W32.HLLW.Kazmor

When W32.HLLW.Kazmor is executed, it does the following:

It copies itself as C:\%Windows%\Windows.exe.

NOTE: %Windows% 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 adds the value

Windows      C:\%Windows%\Windows

to the registry key

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

This causes the worm to run when you start Windows.

The worm then opens a randomly changed TCP/UDP port to connect to the hacker. This allows the hacker to remotely take control of the compromised computer. After the hacker has gained control, the hacker can:

• Launch an IP packets attack
• Send spoofed IP packets to hacker-chosen IP addresses
• Download files from the host computer
• Steal the host system information, such as passwords, OS version, computer name, CPU speed, and shared folder information
• Scan ports

How it spreads

The worm first attempts to create the VBscript file Msvxd.vbs. This .vbs file searches for shared network drives on randomly chosen IP addresses.

It copies itself to the following location on the shared drives:

\Windows\Start Menu\Programs\Startup\Real Player.exe

The worm searches the Windows registry to locate the KaZaA shared folder. Other KaZaA users can download files from that location. The worm then copies itself into this folder using many different names that are chosen randomly from a list that the worm carries. Here are some examples:

• [tmd]star wars episode 2 - attack of the clones [1of1]
• jenna jameson - built for speed
• [DiVX] Lord of the rings
• [DiVX] Harry Potter and the sorcerors stone
• CKY3 - Bam Margera World Industries Alien Workshop
• cat attacks child
• PS1 Boot Disc
• Sony Play station boot disc
• How to hack websites
• AIM Account Stealer
• MSN Password Hacker and Stealer
• Hacking Tool Collection
• Windows XP
• macromedia flash 5.0
• DSL Modem Uncapper
• Internet and Computer Speed Booster
• ZoneAlarm Firewall
• Borland Delphi 6 Key Generator

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.

Summary