WORM_SDBOT.UL

Malware type: Worm

Aliases: W32/Sdbot.worm.gen.p (McAfee), W32.Spybot.Worm (Symantec), TR/Crypt.XPACK.Gen (Avira), W32/Forbot-Gen (Sophos),

In the wild: No

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 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).

It steals the CD keys of popular game applications.

This worm runs on Windows NT, 2000, and XP.

For additional information about this threat, see:

Description created: Sep. 9, 2004 4:03:52 PM GMT -0800
Description updated: Sep. 9, 2004 4:26:44 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 98,199 Bytes

Initial samples received on: Sep 9, 2004

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 DLLHELP.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
Win32 Configuration = "dllhelp.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows
CurrentVersion\RunOnce
Win32 Configuration = "dllhelp.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows
CurrentVersion\RunServices
Win32 Configuration = "dllhelp.exe"

HKEY_CURRENT_USER\Software\Microsoft\Windows
CurrentVersion\Run
Win32 Configuration = "dllhelp.exe"

HKEY_CURRENT_USER\Software\Microsoft\Windows
CurrentVersion\RunOnce
Win32 Configuration = "dllhelp.exe"

It also creates the following registry entries:

HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\
CurrentVersion\Run
Win32Configuration = "dllhelp.exe"

HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\
CurrentVersion\RunOnce
Win32 Configuration = "dllhelp.exe"

Registry entries placed under the key HKEY_USERS\.DEFAULT\ are added as default registry entries whenever a new user account is created.

The worm also registers itself as a service using the name Win32 Configuration. This adds several entries under the following registry keys:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Windows Manage

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\Root\LEGACY_WINDOWS_MANAGE

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 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 is also capable of scanning network shares on random IP addresses. If it gains 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 to propagate.

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:

Information Theft

This worm steals the CD keys of the following popular 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
  • Microsoft Windows Product ID
  • NHL 2002
  • NHL 2003
  • NOX
  • 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)
  • 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



Analysis by: Dennis Biel


SOLUTION


Minimum scan engine version needed: 6.860

Pattern file needed: 2.171.09

Pattern release date: Sep 9, 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 NT, 2000, and XP, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the process:
    DLLHELP.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.

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:
    Win32 Configuration = "dllhelp.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:
    Win32 Configuration = "dllhelp.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:
    Win32 Configuration = "dllhelp.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:
    Win32 Configuration = "dllhelp.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:
    Win32 Configuration = "dllhelp.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:
    Win32 Configuration = "dllhelp.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:
    Win32 Configuration = "dllhelp.exe"
  16. In the left panel, locate and delete the following key:
    HKEY_LOCAL_MACHINE>System>CurrentControlSet>Services>Windows Manage
    (Note: The last registry key is often automatically deleted once the malware process is terminated.)
  17. 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

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_SDBOT.UL. 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


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