Malware type: Worm

Aliases: Backdoor.Win32.IRCBot.az (Kaspersky), W32/Sdbot.worm.gen (McAfee), W32.Spybot.Worm (Symantec), Worm/Rbot.XK (Avira), W32/Rbot-Fam (Sophos), Backdoor:Win32/Rbot (Microsoft)

In the wild: No

Destructive: No

Language: English

Platform: Windows 98, ME, NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:


Distribution potential:



This memory-resident worm spreads via network shares. It uses a list of weak user names and passwords to log on to systems, where it drops a copy of itself.

It also uses another list of user names and passwords, which are hardcoded in its body. Once logged on, it drops a copy of itself on certain network shares and eventually executes itself.

It has backdoor capabilities and may execute remote commands coming from a malicious user. It also steals CD keys of certain game applications.

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

For additional information about this threat, see:

Description created: Aug. 5, 2004 6:47:58 PM GMT -0800
Description updated: Aug. 20, 2004 1:42:20 PM GMT -0800


Size of malware: 129,652 Bytes

Initial samples received on: Aug 5, 2004


Installation and Autostart

This memory-resident worm drops a copy of itself as MSBB.EXE in the Windows system folder. It then sets its dropped file's attributes hidden and system.

It creates the following registry entries to enable its automatic execution every system startup:

Msbb.exe = �Msbb.exe�

Msbb.exe = �Msbb.exe�

Msbb.exe = �Msbb.exe�

It eventually deletes itself.

(Note: The Windows system folder is usually C:\Windows\System on Windows 95, 98 and ME, C:\WINNT\System32 on Windows NT and 2000, and C:\Windows\System32 on Windows XP.)

Network Propagation

It spreads via network shares. It gathers a list of weak user names and passwords. It then searches for and lists down shared folders, where it drops a copy of itself using the gathered information.

Aside from the obtained information, it also uses the following list of user names and passwords hardcoded in its body to access shared folders.

  • 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

(Note: Since this worm exploits weak passwords on Server Message Block (SMB), the propagation routine only works on Windows NT, 2000, XP, and 2003. Other routines or payloads works on Windows 95, 98, and ME.)

Once logged on, it drops a copy of itself on the following default shares and eventually executes itself.

  • %s\ADMIN$\System32
  • %s\C$\WINNT\System32
  • %s\C\Wndows\Sstem32

(Note: %s is the name name of the target share.)

Backdoor Capabilities

This worm opens SMB port 445. It acts as an Internet Relay Chat (IRC) bot to connect to remote IRC server, bleh.hydroice.net, where it listens for the following commands issued by a malicious user:

  • CPU
  • DCC send a copy of the malware
  • Delete network shares
  • Download an updated malware copy
  • Download files from an Internet site
  • Enable debug privilege
  • Execute mIRC related commands
  • Execute, delete, list, and rename files
  • Flush ARP/DNS cache
  • Identify if the malware is executing and the details of the client
  • Internet connection type
  • IP address
  • Join/log out of an mIRC channel
  • Kill processes
  • List all services, users, and shares
  • Log Keystrokes
  • Make the system a TFTP proxy server
  • Make the system an FTP proxy server
  • Make the system an HTTP/HTTPD server
  • Monitor system infection
  • Obtain system specifications such as the following:
  • Perform a Distributed Denial of Service (DDoS) attack
  • Perform a port scan
  • Perform a screen capture
  • Perform Denial of Service attack by launching SYN flood
  • Perform NetBIOS network share attack through SMB (NTSCAN)
  • Perform remote shell operations
  • Reboot system
  • Redirect the user to another mIRC channel
  • Send messages to an mIRC server
  • Send spam emails
  • Start, remove, and crash an IRC bot
  • Steal webcam video
  • Stop NTSCAN attack (NTSTOP)

Information Theft

This worm steals 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
  • 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
  • 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

The stolen information are then sent to a remote email address using the doman no.warez.net.

Other Details

This worm may delete the following shares on NT-based Windows:

  • ADMIN$
  • C$
  • D$
  • IPC$

It is Written in Microsoft Visual C%20%20 and arrives Ezip-compressed.

Analysis by: Paul Arana


Minimum scan engine version needed: 6.810

Pattern file needed: 2.160.00

Pattern release date: Aug 5, 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.


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_SDBOT.QJ.

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.

  1. Open Windows Task Manager.
    � On Windows 98 and ME, press
    � 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:
  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 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:
  3. In the right panel, locate and delete the entry:
    Msbb.exe = �Msbb.exe�
  4. In the left panel, double-click the following:
  5. In the right panel, locate and delete the entry:
    Msbb.exe = �Msbb.exe�
  6. In the left panel, double-click the following:
  7. In the right panel, locate and delete the entry:
    Msbb.exe = �Msbb.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

Running Trend Micro Antivirus

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

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