WORM_RBOT.S

Malware type: Worm

Aliases: Backdoor.Win32.RBot.178688.B, Worm/Rbot.JK

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 certain vulnerabilities to propagate across networks. It takes advantage of the following Windows vulnerabilities:

  • IIS5/WEBDAV Buffer Overflow vulnerability
  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability
  • Buffer Overflow in SQL Server 2000
  • 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, then drops a copy of itself in network shares. It also uses a list of passwords in order to gain access.

It has backdoor capabilities, and attempts to connect to port 6667 (a normal mIRC port) that 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 software applications. It also uses carnivore network sniffer to gather sensitive information from a target system.

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

For additional information about this threat, see:

Description created: May. 17, 2004 2:01:01 PM GMT -0800
Description updated: Sep. 22, 2004 9:47:55 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 108,544 Bytes and 178,688 Bytes

Initial samples received on: May 17, 2004

Payload 1: Compromises system security

Trigger condition 1: Upon execution

Payload 2: Steals CD game keys

Trigger condition 1: Upon execution

Details:

Installation and Autostart Techniques

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

  • MSGFIX.EXE
  • XAGWXZY.EXE

It adds the following registry entries so that it executes at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices
RPC DCOM Vulnerability Patch = �msgfix.exe�
or
Microsoft Update Machine="xagwxzy.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
RPC DCOM Vulnerability Patch = �msgfix.exe�
or
Microsoft Update Machine="xagwxzy.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
RPC DCOM Vulnerability Patch = �msgfix.exe�
or
Microsoft Update Machine="xagwxzy.exe"

Propagation via Network Shares

This worm spreads through network shares. It uses NetBEUI functions to get available lists of user names and passwords. It then lists down the available network shares. It uses the gathered user names and passwords to drop a copy of the worm to the shares. The dropped copy of the worm has the file name same as the executed copy.

It also generates IP addresses and attempts to drop a copy of the malware to the target address� default shares:

  • admin$
  • c$
  • ipc$

Besides the user names and passwords gathered, it also uses the following list:

User names:

  • access
  • accounting
  • accounts
  • backup
  • bitch
  • blank
  • brian
  • changeme
  • chris
  • cisco
  • compaq
  • control
  • databasepass
  • databasepassword
  • db1234
  • dbpass
  • dbpassword
  • domain
  • domainpass
  • domainpassword
  • exchange
  • george
  • hello
  • homeuser
  • internet
  • intranet
  • katie
  • linux
  • login
  • loginpass
  • nokia
  • oeminstall
  • oemuser
  • office
  • orainstall
  • outlook
  • peter
  • qwerty
  • server
  • siemens
  • sqlpassoainstall
  • susan
  • system
  • technical
  • win2000
  • win2k
  • win98
  • windows
  • winnt
  • winpass
  • winxp

Passwords:

  • 12345
  • 123456
  • 1234567
  • 12345678
  • 123456789
  • 1234567890
  • administrador
  • administrat
  • administrateur
  • administrator
  • admins
  • computer
  • database
  • default
  • guest
  • oracle
  • owner
  • pass1234
  • passwd
  • password
  • password1
  • staff
  • student
  • teacher
  • wwwadmin

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:

This worm scans the network for vulnerable systems and notifies the bot with the vulnerable system�s IP address. Using Class B subnet and the infected system�s IP address, it generates random IP addresses and tests it for vulnerability.

It also takes advantage of the backdoor capabilities of the following malware family variants to download a copy of itself into infected machines:

  • BKDR_KUANG
  • BKDR_NETDEVIL
  • BKDR_OPTIX
  • BKDR_SUB7
  • WORM_BAGLE
  • WORM_MYDOOM

Furthermore, it uses Dameware application to propagate.

Backdoor Capabilities

This worm also has backdoor capabilities.

It connects to the Internet Relay Chat (IRC) server scan0r.warez-net.net through port 6667. It then joins the IRC channel #rbot666, where it waits for malicious commands coming from a remote user. It executes the commands locally on the affected machine, providing the malicious user virtual control over the system.

It acts as a bot that responds to private messages with specific keyword triggers. It has the following capabilities:

  • Display system information
  • Enable/delete shares
  • Enable/disable DCOM
  • Open and/or execute a file
  • Exploit machines infected with Mydoom variants
  • Kill a process
  • List processes
  • Perform a Distributed Denial of Service (DDoS) attack
  • Perform IRC operations and port redirection
  • Quit the bot
  • Scan for systems with weak NetBIOS password
  • Visit a URL

Information Theft

This worm uses carnivore network sniffer 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
  • login
  • login

It then attempts to gather CD keys, serial numbers, and even application product IDs. It steals this information from the following software products installed in the system:

  • 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
  • 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 creates the mutex [127.0.0.1. If it finds any instance of this mutex on a target system, this worm terminates its execution.



Analysis by: Ivan Macalintal


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.178.00

Pattern release date: May 17, 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 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 process:
    MSGFIX.EXE or XAGWXZY.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.

*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 during startup.

  1. Open Registry Editor. To do this, 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:
    RPC DCOM Vulnerability Patch = �msgfix.exe�, or
    "Microsoft Update Machine"="xagwxzy.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:
    RPC DCOM Vulnerability Patch = �msgfix.exe�, or
    "Microsoft Update Machine"="xagwxzy.exe"
  6. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>RunService
  7. In the right panel, locate and delete the entry:
    RPC DCOM Vulnerability Patch = �msgfix.exe�, or
    "Microsoft Update Machine"="xagwxzy.exe"
  8. Close Registry Editor.


NOTE: If you were not able to terminate the malware process from memory 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.S. 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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