WORM_WOOTBOT.DN

Malware type: Worm

Aliases: Backdoor.Win32.Wootbot.gen (Kaspersky), W32/Sdbot.worm.gen.h (McAfee), W32.Spybot.Worm (Symantec), Worm/WootBot.151552 (Avira), W32/Forbot-CO (Sophos),

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 memory-resident worm is another variant of the WOOTBOT family. It takes advantage of the following vulnerability present in some Windows systems:

It propagates through network shares, and drops a copy of itself as DLLMANAGER.EXE in the Windows system folder. It steals the CD keys of certain applications and has backdoor capabilities, allowing it to accept commands from a remote user.

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

For additional information about this threat, see:

Description created: Nov. 19, 2004 3:27:21 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 151,552 Bytes

Initial samples received on: Nov 19, 2004

Payload 1: Steals CD keys

Payload 2: Compromises system security

Details:
Arrival and Installation

This worm arrives from network shares. Upon execution, this memory-resident worm drops a copy of itself as DLLMANAGER.EXE in the Windows system folder.

It creates the following registry entries to ensure its automatic execution at every Windows startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Dlite = "dllmanager.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
Dlite = "dllmanager.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Dlite = "dllmanager.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunOnce
Dlite = "dllmanager.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices
Dlite = "dllmanager.exe"

HKEY_USERS\.DEFAULT\Software\Microsoft\
Windows\CurrentVersion\Run
Dlite = "dllmanager.exe"

HKEY_USERS\.DEFAULT\Software\Microsoft\
Windows\CurrentVersion\RunOnce
Dlite = "dllmanager.exe"

Network Propagation and Exploits

This worm propagates by dropping a copy of itself into accessible network shares.

It exploits the following vulnerability in Windows in order to propagate:

The Windows LSASS vulnerability, which is a buffer overrun that allows remote code execution and enables a malicious user to gain full control of the affected system. This vulnerability is discussed in detail in Microsoft Security Bulletin MS04-011 and Trend Micro's Vulnerability Description for MS04-011.

Backdoor Capabilities

This worm acts as an IRC bot that connects to a specific channel, where it listens for commands from a remote user. It executes the following commands locally on the infected system, providing the remote user virtual control over the infected system:

  • Delete network shares
  • Perform basic IRC commands
  • Gather system information
  • Perform FTP commands
  • Perform port scanning
  • Perform process scanning
  • List services
  • Download files
  • Perform UDP or ICMP flooding
  • Create proxy server
  • Execute commands and programs
  • Install a keylogger

Information Theft

This worm is capable of stealing the Windows product ID and the CD keys of the following games:

  • Battlefield 1942
  • Battlefield 1942 (Road To Rome)
  • Battlefield 1942 (Secret Weapons of WWII)
  • Battlefield Vietnam
  • Black and White
  • Chrome
  • Command and Conquer: Generals
  • Command and Conquer: Generals (Zero Hour)
  • Command and Conquer: Red Alert
  • Command and Conquer: Red Alert 2
  • Command and Conquer: Tiberian Sun
  • Counter-Strike (Retail)
  • FIFA 2002
  • FIFA 2003
  • Freedom Force
  • Global Operations
  • Gunman Chronicles
  • Half-Life
  • Hidden & Dangerous 2
  • IGI 2: Covert Strike
  • Industry Giant 2
  • James Bond 007: Nightfire
  • Legends of Might and Magic
  • 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
  • Neverwinter Nights (Hordes of the Underdark)
  • Neverwinter Nights (Shadows of Undrentide)
  • NHL 2002
  • NHL 2003
  • NOX
  • Rainbow Six III RavenShield
  • Shogun: Total War: Warlord Edition
  • Soldier of Fortune II - Double Helix
  • Soldiers Of Anarchy
  • The Gladiators
  • Unreal Tournament 2003
  • Unreal Tournament 2004

It also steals login information for the following Instant Messaging (IM) applications:

  • AOL Instant Messenger
  • MSN Instant Messenger
  • Yahoo Instant Messenger




Analysis by: Marc Sison


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.258.01

Pattern release date: Nov 19, 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:

Terminating the Malware Program

This procedure terminates the running malware process.

  1. Open Windows Task Manager.
    � 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.
  2. In the list of running programs*, locate the process:
    DLLMANAGER.EXE
  3. Select the malware process, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. To check if the malware process has been terminated, close Task Manager, and then open it again.
  5. 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.

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 or entries:
    Dlite = "dllmanager.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 or entries:
    Dlite = "dllmanager.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 or entries:
    Dlite = "dllmanager.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 or entries:
    Dlite = "dllmanager.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 or entries:
    Dlite = "dllmanager.exe"
  12. In the left panel, double-click the following:
    HKEY _USERS>.DEFAULT>Software>Microsoft>
    Windows>CurrentVersion>Run
  13. In the right panel, locate and delete the entry or entries:
    Dlite = "dllmanager.exe"
  14. In the left panel, double-click the following:
    HKEY _USERS>.DEFAULT>Software>Microsoft>
    Windows>CurrentVersion>RunOnce
  15. In the right panel, locate and delete the entry or entries:
    Dlite = "dllmanager.exe"
  16. 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.DN. 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.

RECOMMENDATIONS

Applying Patches

This malware exploits a known vulnerabily. Download and install the following patch to secure your system:

Refrain from using your Microsoft product until the appropriate patch has been installed. Trend Micro advises users to download critical patches upon release by vendors.critical patches upon release by vendors.


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