WORM_SPYBOT.OY

Description: 

This worm drops a copy of itself as XDCC.EXE on target shares. If the said shares are inaccessible, it either uses cached or hardcoded list of user names and passwords as its login credential to gain access.

It may also spread by taking advantage of the following Windows exploits:

• Buffer Overflow in SQL Server 2000, which is a vulnerability that allows a low-level user to run, delete, insert or update Web tasks. In turn, an attacker who is able to authenticate to a SQL server may do the same actions, and run already created Web tasks in the context of the creator of that task. More information on this vulnerability is found in Microsoft Security Bulletin MS02-061.

• The RPC/DCOM vulnerability, which allows an attacker to gain full access and execute any code on a target machine by sending a malformed packet to the DCOM service. It uses the RPC TCP port 135. More information on this vulnerability is found in Microsoft Security Bulletin MS03-026.

• 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 Bulletin MS04-011 and Trend Micro's Vulnerability Description for MS04-011.

This worm comes with a built-in IRC client, which allows it to connect to an IRC channel. It opens a random port and enables a remote malicious user to perform commands locally on affected machines. It also steals CD keys of popular games installed on the said machines.

Details:

Installation and Autostart

Upon execution, this worm drops a copy of itself as a read-only and hidden system file, XDCC.EXE, in the Windows system folder. It then executes the said file and deletes itself.

It then creates the following autostart entries to ensure its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Start Upping = "xdcc.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices
Start Upping = "xdcc.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Start Upping = "xdcc.exe"

Network Propagation

This worm spreads by dropping a copy of itself in available network shares. If the said shares are inaccessible, it either uses cached or hardcoded list, such as the following, of user names and passwords as its login credential to gain access:

• 12345
• 123456
• 1234567
• 12345678
• 123456789
• 1234567890
• access
• accounting
• accounts
• administrador
• administrat
• administrateur
• administrator
• admins
• backup
• bitch
• blank
• brian
• changeme
• chris
• cisco
• compaq
• computer
• control
• database
• databasepass
• databasepassword
• db1234
• dbpass
• dbpassword
• default
• domain
• domainpass
• domainpassword
• exchange
• george
• guest
• hello
• homeuser
• internet
• intranet
• katie
• linux
• login
• loginpass
• nokia
• oeminstall
• oemuser
• office
• oracle
• orainstall
• outlook
• owner
• pass1234
• passwd
• password
• password1
• peter
• qwerty
• server
• siemens
• sqlpassoainstall
• staff
• student
• susan
• system
• teacher
• technical
• win2000
• win2k
• win98
• windows
• winnt
• winpass
• winxp
• wwwadmin

Exploits

This worm may also propagate by taking advantage of systems vulnerable to the following Windows exploits:

• Buffer Overflow in SQL Server 2000, which is a vulnerability that allows a low-level user to run, delete, insert or update Web tasks. In turn, an attacker who is able to authenticate to a SQL server may do the same actions, and run already created Web tasks in the context of the creator of that task. More information on this vulnerability is found in Microsoft Security Bulletin MS02-061.

• The RPC/DCOM vulnerability, which allows an attacker to gain full access and execute any code on a target machine by sending a malformed packet to the DCOM service. It uses the RPC TCP port 135. More information on this vulnerability is found in Microsoft Security Bulletin MS03-026.

• 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 Bulletin MS04-011 and Trend Micro's Vulnerability Description for MS04-011.

Backdoor Capabilities

This worm comes with a built-in IRC client, which allows it to connect to an IRC channel. It opens a random port and enables a remote malicious user to perform commands, such as the following, locally on affected machines:

• Add, continue, delete, list, pause, start, and stop services
• Add, delete, and list network shares
• Check the presence of certain .DLL files
• Delete, download, execute, list, open, rename, and upload files
• Download files
• Enumerate user accounts
• Flush ARP and DNS cache
• List and terminate processes and threads
• Log keystrokes
• Perform basic IRC commands
• Perform denial of service (DoS) attacks through ICMP, PING, and SYN flooding
• Obtain cached passwords
• Obtain clipboard data
• Obtain pertinent system information
• Open a command shell
• Restart the system
• Remove and update itself
• Resolve hostnames
• Restrict and allow access to the shared folder, IPC$
• Scan ports
• Send email messages
• Send UDP packets and pings to a remote computer
• Sniff packets

Information Theft

This worm steals CD keys of the following games:

• Battlefield 1942
• Battlefield 1942 (Road To Rome)
• Battlefield 1942 (Secret Weapons of WWII)
• Battlefield Vietnam
• Black and White
• Call of Duty
• 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
• FarCry
• Freedom Force
• Global Operations
• Ground Control II
• Gunman Chronicles
• Half-Life
• Hidden & Dangerous 2
• IGI 2: Covert Strike
• Industry Giant 2
• James Bond 007: Nightfire
• Joint Operations
• Legends of Might and Magic
• 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
• 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

Other Details

This worm is compiled in Visual C%20%20. It runs on Windows NT, 2000, and XP.

Analysis By: Michael Stephen Tonido

Revision History:

First pattern file version: 4.126.03

First pattern file release date: Dec 20, 2006

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:
   xdcc.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.

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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:
   Start Upping = "xdcc.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:
   Start Upping = "xdcc.exe"
6. In the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>
   Windows>CurrentVersion>Run
7. In the right panel, locate and delete the entry:
   Start Upping = "xdcc.exe"
8. Close Registry Editor.

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

Enabling Show All Files

This procedure allows you to access hidden malware files using Windows Explorer.

� On Windows NT

1. Open Windows Explorer. Right-click Start then click Explore.
2. On the View menu, click Options or Folders Options.
3. Click the View tab.
4. Select Show all files, then click OK.

� On Windows 2000 and XP

1. Open Windows Explorer. Right-click Start then click Explore.
2. On the Tools menu, click Folder Options.
3. Click the View tab.
4. Select Show hidden files and folders, then click OK.

Additional Windows XP Cleaning Instructions

Users running Windows 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_SPYBOT.OY. 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 in the following pages:

• Microsoft Security Bulletin MS02-061
• Microsoft Security Bulletin MS03-026
• Microsoft Security Bulletin MS04-011

Refrain from using the affected software until the appropriate patch has been installed.

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