WORM_WOOTBOT.DY

Malware type: Worm

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 95, 98, ME, NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

This worm takes advantage of the Windows LSASS vulnerability to propagate across networks. For more information about this vulnerability, refer to the following Microsoft page:

It is also capable of scanning network shares on random IP addresses. When it is able to gain full access rights to a remote system, it copies itself to a shared folder.

This worm has backdoor capabilities, and may execute commands coming from a remote malicious user. It also steals the Microsoft Windows Product ID, as well as the CD keys of certain game applications.

It runs on Windows 95, 98, ME, NT, 2000, and XP.

For additional information about this threat, see:

Description created: Nov. 29, 2004 11:45:15 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 106,912 Bytes

Initial samples received on: Nov 29, 2004

Variant ofWORM_WOOTBOT.GEN

Payload 1: Steals CD keys

Payload 2: Performs backdoor routines

Details:

Installation and Autostart Techniques

Upon execution, this memory-resident worm drops a copy of itself in the Windows system folder as the file MSCONFIG32.EXE.

It creates the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
MS Configuration Utility = "msconfig32.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
MS Configuration Utility = "msconfig32.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
MS Configuration Utility = "msconfig32.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\ Windows\CurrentVersion\RunOnce
MS Configuration Utility = "msconfig32.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices
MS Configuration Utility = "msconfig32.exe"

It also creates the following registry entries to enable its automatic execution whenevder a new user account is created:

HKEY_USERS\.Default\Software\Microsoft\
Windows\CurrentVersion\Run
MS Configuration Utility = "msconfig32.exe"

HKEY_USERS\.Default\Software\Microsoft\
Windows\CurrentVersion\RunOnce
MS Configuration Utility = "msconfig32.exe"

This worm also registers itself as a service by creating the following registry key:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\
MS Configuration Utility

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\
Root\LEGACY_MS_CONFIGURATION_UTILITY

Network Propagation

To propagate across networks, this worm takes advantage of the Windows LSASS vulnerability, which is a buffer overrun vulnerability that allows remote code execution. Once successfully exploited, a remote attacker is able to gain full control of the affected system.

For more information about this vulnerability, refer to the following Microsoft page:

It is also capable of scanning network shares on random IP addresses. When it is able to gain full access rights to a remote system, it copies itself to a shared folder.

This worm may also use the backdoor capabilities of other malware programs to propagate.

Backdoor Capabilities

This worm connects to an Internet Relay Chat (IRC) server where it waits for commands coming from a remote malicious user. It executes these commands on the local machine, providing the remote user virtual control over the system.

It is able to execute the following commands:

  • Add/Delete registry
  • Add/Delete service
  • Connect to an HTTP or FTP address
  • Delete shares
  • Enable/Disable DCOM
  • Execute a file
  • Find email messages
  • Find files
  • Get CD keys
  • Get system information (e.g., CPU, RAM, OS, etc.)
  • List and terminate processes
  • Log off, shut down or reboot system
  • Perform distributed denial of service (DDoS) flood attack
  • Scan network for vulnerable systems
  • Send file via IRC DCC
  • Start port redirect
  • Start proxy server

Information Theft

This worm also steals the Microsoft Windows Product ID, as well as the CD keys of the following games:

  • Battlefield 1942
  • Battlefield 1942: Secret Weapons Of WWII
  • Battlefield 1942: The Road To Rome
  • Battlefield 1942: Vietnam
  • Black and White
  • Command and Conquer: Generals
  • Command and Conquer: Generals: Zero Hour
  • Command and Conquer: Red Alert2
  • Command and Conquer: Tiberian Sun
  • Counter-Strikes
  • FIFA 2002
  • FIFA 2003
  • Freedom Force
  • Global Operations
  • Gunman Chronicles
  • Half-Life
  • Hidden and Dangerous 2
  • IGI2: Covert Strike
  • Industry Giant 2
  • James Bond 007: Nightfire
  • Medal of Honor: Allied Assault
  • Medal of Honor: Allied Assault: Breakthrough
  • Medal of Honor: Allied Assault: Spearhead
  • Nascar Racing 2002
  • Nascar Racing 2003
  • Need For Speed: Hot Pursuit 2
  • Need For Speed: Underground
  • Neverwinter Nights
  • NHL 2002
  • NHL 2003
  • Ravenshield
  • Shogun: Total WarWarlord Edition
  • Soldier Of Fortune 2
  • Soldiers Of Anarchy
  • The Gladiators
  • Unreal Tournament 2003
  • Unreal Tournament 2004

Other Details

This worm is written in Visual C%20%20 and arrives compressed using FSG.




Analysis by: Rodelito Mendrez


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.270.01

Pattern release date: Nov 29, 2004


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Restarting in Safe Mode

On Windows 95

  1. Restart your computer.
  2. Press F8 at the Starting Windows 95 message.
  3. Choose Safe Mode from the Windows 95 Startup Menu then press Enter.

On Windows 98 and ME

  1. Restart your computer.
  2. Press the CTRL key until the startup menu appears.
  3. Choose the Safe Mode option then press Enter.

On Windows NT (VGA mode)

  1. Click Start>Settings>Control Panel.
  2. Double-click the System icon.
  3. Click the Startup/Shutdown tab.
  4. Set the Show List field to 10 seconds and click OK to save this change.
  5. Shut down and restart your computer.
  6. Select VGA mode from the startup menu.

On Windows 2000

  1. Restart your computer.
  2. Press the F8 key, when you see the Starting Windows bar at the bottom of the screen.
  3. Choose the Safe Mode option from the Windows Advanced Options Menu then press Enter.

On Windows XP

  1. Restart your computer.
  2. Press F8 after the Power-On Self Test (POST) is done. If the Windows Advanced Options Menu does not appear, try restarting and then pressing F8 several times after the POST screen.
  3. Choose the Safe Mode option from the Windows Advanced Options Menu then press Enter.

Note: After performing all the solutions for the removal of this malware, please restart your system normally, and run your Trend Micro antivirus product.

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing at startup.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    MS Configuration Utility = "msconfig32.exe"
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>RunOnce
  5. In the right panel, locate and delete the entry:
    MS Configuration Utility = "msconfig32.exe"
  6. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>RunServices
  7. In the right panel, locate and delete the entry:
    MS Configuration Utility = "msconfig32.exe"
  8. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>Run
  9. In the right panel, locate and delete the entry:
    MS Configuration Utility = "msconfig32.exe"
  10. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>RunOnce
  11. In the right panel, locate and delete the entry:
    MS Configuration Utility = "msconfig32.exe"
  12. In the left panel, double-click the following:
    HKEY_USERS>.Default>Microsoft>
    Windows>CurrentVersion>Run
  13. In the right panel, locate and delete the entry:
    MS Configuration Utility = "msconfig32.exe"
  14. In the left panel, double-click the following:
    HKEY_USERS>.Default>Microsoft>
    Windows>CurrentVersion>Run
  15. In the right panel, locate and delete the entry:
    MS Configuration Utility = "msconfig32.exe"

Removing Other Malware Entries from the Registry

  1. Still in the Registry Editor, in the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>System>CurrentControlSet>Services
  2. Locate and delete the subkey:
    MS Configuration Utility
  3. Close Registry Editor.

NOTE: If you were not able to terminate the malware process as described in the previous procedure, restart your system.

Additional Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected systems.

Users running other Windows versions can proceed with the succeeding procedure sets.

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_WOOTBOT.DY. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro�s free online virus scanner.

Applying Patches

This malware exploits known vulnerabilities in Windows. Download and install the fix patch supplied by Microsoft. Refrain from using this product until the appropriate patch has been installed. Trend Micro advises users to download critical patches upon release by vendors.


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