WORM_RBOT.XT

Malware type: Worm

Aliases: Backdoor.Win32.SdBot.awk (Kaspersky), W32/Sdbot.worm.gen.h (McAfee), W32.Spybot.Worm (Symantec), TR/Downloader.Gen (Avira), Mal/Packer (Sophos), Backdoor:Win32/Rbot (Microsoft)

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 spreads via network shares. It exploits the following vulnerabilities to propagate across networks:

  • IIS5/WEBDAV Buffer Overflow vulnerability
  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability
  • Buffer Overflow in SQL Server 2000 vulnerability
  • Windows LSASS vulnerability

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

It uses NetBEUI functions to get available lists of user names and passwords, which it uses to gain access to target systems. It may also use a list of passwords, aside from the gathered data. It then drops a copy of itself in accessed network shares.

It has backdoor capabilities, and attempts to connect to an Internet Relay Chat (IRC) server, using random TCP ports. This allows a remote user to access the infected system and perform malicious commands. It can also steal the Windows Product ID and CD keys of popular game applications.

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

For additional information about this threat, see:

Description created: Nov. 11, 2004 3:14:06 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 93,210 Bytes

Initial samples received on: Nov 11, 2004

Payload 1: Compromises system security

Payload 2: Steals system information

Details:

Installation and Autostart Technique

Upon execution, this memory-resident worm drops a copy of itself in the Windows system folder as the following file:

    MCUPDATE.EXE

It creates several threads, which it uses for its keylogging and backdoor capabilities.

It adds the following registry entries to enable its dropped copy to run at every Windows startup:

HKEY_LOCAL_MACHINE\Software\Microsoft
Windows\CurrentVersion\Run
Microsoft Update = "Mcupdate.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft
Windows\CurrentVersion\RunServices
Microsoft Update = "Mcupdate.exe"

HKEY_CURRENT_USER\Software\Microsoft
Windows\CurrentVersion\Run
Microsoft Update = "Mcupdate.exe"

Network Propagation

This worm spreads via network shares. It uses NetBEUI functions to get available lists of user names and passwords. It then locates and lists down the following shared folders, where it drops a copy of itself using the gathered information:

  • ADMIN$\system32
  • C$\Windows\system32
  • C$\WINNT\system32
  • IPC$

It looks for the following weak user names and passwords:

User names:

  • <blank>
  • accounting
  • accounts
  • administrador
  • administrat
  • administrateur
  • administrator
  • admins
  • blank
  • brian
  • chris
  • cisco
  • compaq
  • computer
  • control
  • database
  • default
  • george
  • guest
  • homeuser
  • internet
  • intranet
  • katie
  • linux
  • login
  • nokia
  • oeminstall
  • oemuser
  • office
  • oracle
  • orainstall
  • outlook
  • owner
  • peter
  • server
  • siemens
  • staff
  • student
  • susan
  • system
  • teacher
  • win2000
  • win2k
  • win98
  • windows
  • winnt
  • winxp
  • wwwadmin

Passwords:

  • 12345
  • 123456
  • 1234567
  • 12345678
  • 123456789
  • 1234567890
  • <blank>
  • access
  • administrador
  • administrat
  • administrateur
  • administrator
  • admins
  • backup
  • bitch
  • changeme
  • databasepass
  • databasepassword
  • db1234
  • dbpass
  • dbpassword
  • domain
  • domainpass
  • domainpassword
  • exchange
  • hello
  • loginpass
  • pass1234
  • passwd
  • password
  • password1
  • qwerty
  • sqlpassoainstall
  • technical
  • winpass

Exploits

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

Read more on this vulnerability from the following link:

It also takes advantage of the Buffer Overflow in SQL Server 2000 vulnerability. More information about this vulnerability from the following link:

This worm also exploits the IIS5/WEBDAV buffer overrun exploit affecting Windows NT platforms, which enables arbitrary codes to execute on the server.

The following link offers more information from Microsoft about this vulnerability:

It also takes advantage of the Windows LSASS vulnerability, which is a buffer overrun vulnerability that allows remote code execution. Once successfully exploited, a remote attacker is able to gain full control of the affected system.

For more information about this vulnerability, refer to the following Microsoft pages:

Denial of Service

This worm launches a denial of service (DoS) attack against a target location by performing any of the following flood attacks on random IP addresses:

  • ICMP
  • HTTP
  • SYN
  • UDP

Backdoor Capabilities

This worm connects to the Internet Relay Chat (IRC) server irc.t3musso.net using random TCP ports. It then listens for commands from a remote malicious user, which it then issues locally on the affected machine, thus compromising network security.

Some of these commands are as follows:

  • Update malware from HTTP and FTP URL
  • Steal CD keys of games
  • Execute a file
  • Download from HTTP and FTP URL
  • Open a command shell
  • Open files
  • Display the driver list
  • Get screen capture
  • Capture pictures and video clips
  • Display network information
  • Make a bot join a channel
  • Stop and start a thread
  • List all running process
  • Rename a file
  • Generate a random nickname
  • Perform DDoS attacks
  • Retrieve and clear log files
  • Terminate the bot
  • Disconnect the bot from IRC
  • Send a message to the IRC server
  • Let the bot perform mode change
  • Change bot ID
  • Display connection type, local IP address, and other net information
  • Log on and log off the user
  • Issue ping attack to a target system
  • Log user keystrokes
  • Display system information such as the following:
    • CPU speed
    • Amount of Memory
    • Windows platform, build version, and product ID
    • Malware uptime
    • User name

Information Theft

This worm uses a network sniffer called Carnivore, and checks for the following strings:

  • : auth
  • : login
  • :!auth
  • :!hashin
  • :!login
  • :!secure
  • :!syn
  • :$auth
  • :$hashin
  • :$login
  • :$syn
  • :%auth
  • :%hashin
  • :%login
  • :%syn
  • :&auth
  • :&login
  • :'auth
  • :'login
  • :*auth
  • :*login
  • :%20auth
  • :%20login
  • :,auth
  • :,login
  • :-auth
  • :-login
  • :.auth
  • :.hashin
  • :.login
  • :.secure
  • :.syn
  • :/auth
  • :/login
  • :=auth
  • :=login
  • :?auth
  • :?login
  • :@auth
  • :@login
  • :\auth
  • :\login
  • :~auth
  • :~login
  • PAYPAL
  • PAYPAL.COM
  • login
  • login
  • paypal
  • paypal.com

This worm also steals the Windows Product ID, as well as the CD keys of the following game applications:

  • 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

Other Details

This worm is compressed using PE Diminisher.




Analysis by: Dexter To


SOLUTION


Minimum scan engine version needed: 7.500

Pattern file needed: 3.598.02

Pattern release date: Jul 24, 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:

Identifying the Malware Program

To remove this malware, first identify the malware program.

  1. Scan your system with your Trend Micro antivirus product.
  2. NOTE all files detected as WORM_RBOT.XT.

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micro�s free online virus scanner.

Terminating the Malware Program

This procedure terminates the running malware process. You will need the name(s) of the file(s) detected earlier.

  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 malware file(s) detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. Do the same for all detected malware files in the list of running processes.
  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.

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:
    Microsoft Update = "Mcupdate.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:
    Microsoft Update = "Mcupdate.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:
    Microsoft Update = "Mcupdate.exe"
  8. 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_RBOT.XT. 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:

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


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