WORM_WOOTBOT.CR

Malware type: Worm

In the wild: Yes

Destructive: No

Language: English

Platform: Windows NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

This worm exploits Windows LSASS (Local Security Authority Subsystem Service) vulnerability to propagate. The vulnerability is a buffer overrun that allows remote code execution and enables an attacker to gain full control of an affected system. Read more on this vulnerability from Microsoft Security Bulletin MS04-011.

This worm also has backdoor functionalities and operates as an IRC bot. It comes with a built-in Internet Relay Chat (IRC) client engine, which enables it to connect to an IRC channel and wait for commands from a malicious user. It processes the commands on the local machine giving remote users virtual control over the infected system.

This worm also steals the Windows Product ID and the CD keys of certain game applications.

It runs on Windows NT, 2000, and XP.

For additional information about this threat, see:

Description created: Nov. 30, 2004 10:19:02 AM GMT -0800
Description updated: Nov. 30, 2004 10:19:34 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 99,360 Bytes

Initial samples received on: Nov 8, 2004

Details:

Installation and Autostart Technique

Upon execution, this worm drops a copy of itself as FOWILCO.EXE in the Windows system folder.

(Note: The Windows system folder, which is usually C:\Windows\System on Windows 95, 98 and ME, C:\WINNT\System32 on Windows NT and 2000, and C:\Windows\System32 on Windows XP.)

It then creates the following registry entries so that it executes every time Windows starts:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
FoWilCo="fowilco.exe"

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\
CurrentVersion\Runonce
FoWilCo="fowilco.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
FoWilCo="fowilco.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Runonce
FoWilCo="fowilco.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\RunServices
FoWilCo="fowilco.exe"

HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
FoWilCo="fowilco.exe"

HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Windows\
CurrentVersion\Runservices
FoWilCo="fowilco.exe"

This worm also registers itself as a service and creates the following registry key, where it stores information:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Cronation

It has the service display name FoWilCo.

Network Propagation

This worm exploits Windows LSASS (Local Security Authority Subsystem Service) vulnerability to propagate. The vulnerability is a buffer overrun that allows remote code execution and enables an attacker to gain full control of an affected system. Read more on this vulnerability from Microsoft Security Bulletin MS04-011.

Backdoor Capabilities

This worm also has backdoor capabilities and operates as an IRC bot. It connects to a remote IRC server and joins a specific IRC channel, where it receives commands from a remote malicious user.

Some of these commands are as follows:

  • Scan for ports
  • Remove the following network shares:
    • Admin$
    • IPC$
    • D$
    • C$
  • Retrieve system data such as available memory and CPU speed
  • Parse the registry for the Windows Product ID and the CD keys of popular games

Information Theft

This worm steals the AOL screen name, the Yahoo user ID and the Windows Product ID.

It also steals the CD keys of the following game applications:

  • Battlefield 1942
  • Battlefield 1942: Secret Weapons Of WWII
  • Battlefield 1942: The Road To Rome
  • Battlefield 1942: Vietnam
  • Black and White
  • Command and Conquer: Generals: Zero Hour
  • Command and Conquer: Red Alert2
  • Command and Conquer: Tiberian Sun
  • Counter-Strike
  • 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
  • NHL 2002
  • NHL 2003
  • Nascar Racing 2002
  • Nascar Racing 2003
  • Need For Speed: Hot Pursuit 2
  • Need For Speed: Underground
  • Neverwinter Nights
  • Ravenshield
  • Shogun: Total War: Warlord Edition
  • Soldier Of Fortune 2
  • Soldiers Of Anarchy
  • The Gladiators
  • Unreal Tournament 2003
  • Unreal Tournament 2004



Analysis by: Elmer Ubalde


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.239.20

Pattern release date: Nov 8, 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:
    FoWilCo = �Fowilco.exe �
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Runservices
  5. In the right panel, locate and delete the entry:
    FoWilCo = �Fowilco.exe �
  6. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Runonce
  7. In the right panel, locate and delete the entry:
    FoWilCo = �Fowilco.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:
    FoWilCo = �Fowilco.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:
    FoWilCo = �Fowilco.exe�
  12. In the left panel, double-click the following:
    HKEY_USERS>.DEFAULT>Software>Microsoft>
    Windows>CurrentVersion>Runonce
  13. In the right panel, locate and delete the entry:
    FoWilCo = �Fowilco.exe�
  14. In the left panel, double-click the following:
    HKEY_USERS>.DEFAULT>Software>Microsoft>
    Windows>CurrentVersion>Run
  15. In the right panel, locate and delete the entry:
    FoWilCo = �Fowilco.exe�
  16. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services
  17. Still in the left panel, locate and delete the key:
    NDIS TCP Layer Transport Device
  18. Close Registry Editor.

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

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.CR. 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 online virus scanner.

Applying Patches

This malware exploits known vulnerabilities on NT-based platforms. Download and install the critical patch from the following links:




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