WORM_RBOT.BO

Malware type: Worm

Aliases: Backdoor.Win32.Rbot.gen (Kaspersky), W32/Sdbot.worm.gen (McAfee), W32.Spybot.Worm (Symantec), Worm/Rbot.CE (Avira), W32/Rbot-FB (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 spreads via network shares, and takes advantage of the following Windows vulnerability to propagate across networks:

    Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability

For more information about this Windows vulnerability, please refer to the following Microsoft Web page:

This worm attempts to log on to systems using a list of user names and passwords hardcoded in its body. It then drops a copy of itself in the accessed machines.

This worm also steals the CD keys of certain game applications. It also has backdoor capabilities and may execute commands issued by a remote user.

This worm runs on Windows NT, 2000 and XP.

For additional information about this threat, see:

Description created: Jul. 3, 2004 4:25:05 PM GMT -0800
Description updated: Jul. 3, 2004 4:41:51 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 95,128 Bytes

Initial samples received on: Jul 3, 2004

Details:

Installation and Autostart

Upon execution, this memory-resident worm drops a copy of itself as VSMON.EXE in the Windows system folder.

This worm then creates the following registry entries, to ensure its automatic execution whenever Windows starts up:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Zone Alarm = �vsmon.exe�

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Zone Alarm = �vsmon.exe�

It also creates the following registry entry to ensure that it runs as a service process:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices
Zone Alarm = �vsmon.exe�

Exploit

To facilitate its propagation, this worm takes advantage of the following vulnerability, which allows an attacker to gain full access and execute any code on a target machine, leaving it compromised:

    Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability

For more information about this Windows vulnerability, please refer to the following Microsoft Web page:

Network Propagation

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

  • Admin$\system32
  • c$\windows\system32
  • c$\winnt\system32
  • ipc$

In addition to the gathered user names and password information, this worm also uses the following usernames and passwords which are hardcoded in its body:

  • 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

Every successfully dropped malware copy is remotely executed as a service.

Backdoor Capabilities

This worm connects to port 6667 (a normal mIRC port) and joins a specific channel where it listens for commands issued by the remote malicious user. These commands include the following:

  • Disable network shares
  • Download an update version of itself
  • Download and execute a file
  • Launch a SYN and ICMP flood attack
  • List and terminate services and processes
  • Open and execute a file
  • Perform several IRC-related functions
  • Redirect connections
  • Steal system information, as follows:
    • CPU speed
    • Currently logged-in user
    • Free/Total RAM
    • Malware uptime
    • Windows version and build
  • Visit a particular Web site

Information Theft

This worm also 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
  • Command and Conquer: Generals
  • Command and Conquer: Generals (Zero Hour)
  • Command and Conquer: Red Alert
  • Command and Conquer: Red Alert 2
  • Counter-Strike (Retail)
  • FIFA 2002
  • FIFA 2003
  • Freedom Force
  • Global Operations
  • Gunman Chronicles
  • Half-Life
  • 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
  • NHL 2002
  • NHL 2003
  • Rainbow Six III RavenShield
  • Shogun: Total War: Warlord Edition
  • Soldiers Of Anarchy
  • The Gladiators
  • Unreal Tournament 2003
  • Unreal Tournament 2004

Other Details

This worm is written and compiled using Visual C%20%20.




Analysis by: Mylene Enriquez


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 1.926.25

Pattern release date: Jul 3, 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:

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.BO.

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. 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.

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:
    Zone Alarm = �vsmon.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:
    Zone Alarm = �vsmon.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:
    Zone Alarm = �vsmon.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 XP Cleaning Instructions

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_RBOT.BO. 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 the following known vulnerability in Windows:

    Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability

Download and install the following fix patch supplied by Microsoft:

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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