WORM_WOOTBOT.GI

Malware type: Worm

Aliases: No Alias Found

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 following Windows vulnerabilities:

  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability
  • Windows LSASS vulnerability

For more information about these Windows vulnerabilities, please refer to the following Microsoft Web pages:

It also attempts to log on to systems using a list of user names and passwords. It drops a copy of itself into accessible machines.

This worm has backdoor capabilities. It executes commands sent in via Internet Relay Chat (IRC) and can be used to launch a Denial of Service (DoS) attack against specified target sites.

It steals the CD keys of popular game applications.

For additional information about this threat, see:

Description created: Feb. 19, 2005 3:43:06 PM GMT -0800
Description updated: Feb. 19, 2005 4:03:09 PM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 88,576 Bytes (compressed)

Initial samples received on: Feb 19, 2005

Vulnerability used:  (MS04-011) Security Update for Microsoft Windows (835732), (MS03-026) Buffer Overrun In RPC Interface Could Allow Code Execution

Payload 1: Compromises system security

Trigger condition 1: Upon execution

Payload 2: Steals CD keys

Trigger condition 1: Upon execution

Details:
Installation and Autostart Technique

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

It then adds the following registry entries, which allow it to run automatically at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows
CurrentVersion\Run
System driver = "Messenger.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows
CurrentVersion\RunOnce
System driver = "Messenger.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows
CurrentVersion\RunServices
System driver = "Messenger.exe"

HKEY_CURRENT_USER\Software\Microsoft\Windows
CurrentVersion\Run
System driver = "Messenger.exe"

HKEY_CURRENT_USER\Software\Microsoft\Windows
CurrentVersion\RunOnce
System driver = "Messenger.exe"

It also installs itself as a service by creating the following registry keys:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Enum\Root\LEGACY_INTERNET_EXPLORAR

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\Internet Explorar

Network Propagation and Exploits

This worm takes advantage of the Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability, which allows an attacker to gain full access and execute any code on a target machine.

Read more on this vulnerability from the following page:

This worm looks for vulnerable Windows XP machines on the network by scanning for random TCP/IP addresses on port 135.

This worm also exploits the Windows LSASS vulnerability, which is a buffer overrun that allows remote code execution and enables an attacker to gain full control of affected systems. This vulnerability is discussed in detail in the following pages:

This worm copies and executes itself on vulnerable systems.

It searches for the following default network shares:

  • ADMIN$
  • C$
  • D$
  • E$
  • IPC$

It uses the default shares to determine access and copies itself to the shared folders if it has full access rights. However, if these shared folders have restricted access rights, it attempts to brute-force its way into the systems by logging on using the following user names and passwords:

Backdoor Capabilities

This worm has backdoor capabilities. It connects to an Internet Relay Chat (IRC) server and automatically joins a specific channel, where it listens for commands coming from a remote user. It executes commands locally on the affected machines, providing remote users virtual control over affected systems.

It acts as a bot that responds to private messages with specific keyword triggers. The following are the corresponding actions it performs:

  • Disable processes
  • Download files
  • Enable/disable services
  • Open and execute a file
  • Perform DDoS attacks
  • Shutdown the computer
  • Upload and download files via FTP

Information Theft

This worm steals the CD keys of the following popular 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-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:

Other Details

This worm affects systems running on Windows 95, 98, ME, NT, 2000, and XP platforms.

Analysis By: Elda Viray Dimakiling


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.425.01

Pattern release date: Feb 20, 2005


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.

Terminating the Malware Program

This procedure terminates the running malware process.

  1. Open Windows Task Manager.

  2. � On Windows 95, 98, and ME, press
    CTRL%20ALT%20DELETE
    � On Windows NT, 2000, and XP, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  3. In the list of running programs*, locate the process:
    MESSENGER.EXE
  4. Select the malware process, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  5. To check if the malware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

*NOTE: On systems running Windows 95, 98, and ME, Windows Task Manager may not show certain processes. You can use a third party process viewer such as Process Explorer to terminate the malware process. Otherwise, continue with the next procedure, noting additional instructions.

Disabling Malware Service

This procedure stops the running malware service on systems running Windows NT, 2000, and XP.

  1. Open a command prompt window. Click Start>Run, type CMD, and then press the Enter.
  2. At the command prompt, type the following:
    NET STOP "Internet Explorar"
  3. Press Enter. A message should indicate that the service has been stopped successfully.
  4. Close the command prompt window

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:
    System driver = "Messenger.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:
    System driver = "Messenger.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:
    System driver = "Messenger.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:
    System driver = "Messenger.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:
    System driver = "Messenger.exe"
  12. In the left panel, locate and delete the following subkeys:
    � HKEY_LOCAL_MACHINE>System>CurrentControlSet>
    Enum\Root\LEGACY_INTERNET_EXPLORAR
    � HKEY_LOCAL_MACHINE>System>CurrentControlSet>
    Services>Internet Explorar
  13. Close Registry Editor.

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

Important Windows ME/XP Cleaning Instructions

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

Running Trend Micro Antivirus

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

Applying Patches

Download the latest patches. Information on the vulnerabilities exploited by this malware and corresponding patches can be found at the following links:

Microsoft Security Bulletin MS03-026
Microsoft Security Bulletin MS04-011


Trend Micro offers best-of-breed antivirus and content-security solutions for your corporate network, small and medium business, mobile device or home PC.