WORM_RBOT.ENU

Malware type: Worm

Aliases: Backdoor.Win32.Rbot.gen (Kaspersky), W32/Sdbot.worm.gen.bz (McAfee), W32.Spybot.Worm (Symantec), Worm/Rbot.89412 (Avira), Mal/IRCBot-B (Sophos), Backdoor:Win32/Rbot (Microsoft)

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, NT, 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Infection Channel 1 : Propagates via network shares


Infection Channel 2 : Propagates via software vulnerabilities


Description: 

This memory-resident worm propagates across networks by dropping a copy of itself into network shares. If the said shares are password-protected, it uses a list of user names and passwords as logon credentials to gain access.

It also exploits the following Windows vulnerabilities to propagate across networks:

  • RPC/DCOM vulnerability
  • LSASS vulnerability

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

Using various ports, it connects to several Internet Relay Chat (IRC) servers and joins the IRC channel #babez8, where it listens for commands from a remote malicious user. The said commands are executed locally on affected machines, thus compromising system security.

This worm has the ability to terminate processes running on the affected system. Most of these processes are related to antivirus and security applications.

Moreover, it has the ability to steal information. It steals CD keys and product codes of certain game applications installed on an affected system.

For additional information about this threat, see:

Description created: May. 31, 2006 12:27:36 PM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 89,412 Bytes (compressed)

Ports used: Varies

Initial samples received on: Apr 26, 2006

Compression type: NSPack

Vulnerability used:  (MS04-011) Security Update for Microsoft Windows (835732), (MS03-026) Buffer Overrun In RPC Interface Could Allow Code Execution

Payload 1: Compromises system security

Payload 2: Terminates processes

Payload 3: Steals information

Details:

Installation and Autostart Technique

Upon execution, this worm drops a copy of itself in the Windows system folder as MICROSOT32.EXE.

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Microsoft Configuration 77 = "microsot32.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
Microsoft Configuration 77 = "microsot32.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Configuration 77 = "microsot32.exe"

It also modifies certain registry entries as part of its installation routine, as follows:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole
EnableDCOM = "N"

(Note: The default value data for this entry is "Y".)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Lsa
restrictanonymous = "dword:00000001"

(Note: The value data for this entry is usually user-defined.)

Propagation via Network Shares

This worm propagates by dropping a copy of itself into the following network shares:

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

If the said shares are password-protected, it uses the following list of user names and passwords as logon credentials to gain access:

  • 12345
  • 123456
  • 1234567
  • 12345678
  • 123456789
  • 1234567890
  • access
  • accounting
  • accounts
  • admin
  • administrador
  • administrat
  • administrateur
  • administrator
  • admins
  • b0n3s
  • b0nes
  • backup
  • bitch
  • blank
  • bones
  • brian
  • changeme
  • chris
  • cisco
  • compaq
  • computer
  • control
  • database
  • databasepass
  • databasepassword
  • db1234
  • dbpass
  • dbpassword
  • default
  • defaultpass
  • domain
  • domainpass
  • domainpassword
  • exchange
  • ferret
  • george
  • guest
  • hello
  • homeuser
  • internet
  • intranet
  • james
  • katie
  • klingon
  • linux
  • login
  • loginpass
  • maryjim
  • ncc1701
  • ncc1701a
  • ncc1701b
  • ncc1701c
  • ncc1701d
  • ncc1701e
  • nokia
  • oeminstall
  • oemuser
  • office
  • oracle
  • orainstall
  • outlook
  • owner
  • pass1234
  • passwd
  • password
  • password1
  • peter
  • picard
  • psycorats
  • psycoratsonacid
  • qwerty
  • scotty
  • server
  • siemens
  • spock
  • sqlpassoainstall
  • staff
  • startrek
  • student
  • susan
  • system
  • teacher
  • technical
  • weiredweasel
  • win2000
  • win2k
  • win98
  • windows
  • winnt
  • winpass
  • winxp
  • wiredwesel
  • wwwadmin

Propagation via Software Vulnerabilities

It also exploits the following Windows vulnerabilities to propagate across networks:

  • RPC/DCOM vulnerability
  • LSASS vulnerability

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

Backdoor Capabilities

This worm acts as a server program controlled by an Internet Relay Chat (IRC) bot. It opens various ports and connects to the following IRC servers:

  • codeshit.clicky.info
  • sexy.infernoslair.com

It then joins the IRC channel #babez8. Once connected, this server program receives commands from the IRC bot. These commands are used to control the target system and the behavior of the server program. The commands it performs are as follows:

  • Add and delete network shares
  • Download and execute files
  • Delete files
  • Flush the DNS cache
  • Perform denial of service (DoS) attacks using various flooding methods
  • List and terminate processes
  • Perform basic FTP and HTTP operations
  • Perform port scanning and redirection

Process Termination

This worm terminates the following processes running on the affected system, most of which are related to security applications:

  • BBEAGLE.EXE
  • D3DUPDATE.EXE
  • I11R54N4.EXE
  • IRUN4.EXE
  • MSBLAST.EXE
  • MSBLAST.EXE
  • MSCONFIG.EXE
  • MSCVB32.EXE
  • NAVAPW32.EXE
  • NAVW32.EXE
  • NETSTAT.EXE
  • PANDAAVENGINE.EXE
  • PENIS32.EXE
  • RATE.EXE
  • REGEDIT.EXE
  • SSATE.EXE
  • SYSINFO.EXE
  • SYSMONXP.EXE
  • TEEKIDS.EXE
  • WINCFG32.EXETASKMON.EXE
  • WINSYS.EXE
  • WINUPD.EXE
  • ZAPRO.EXE
  • ZONEALARM.EXE

Information Theft

This worm steals the Windows product ID, as well as the CD keys of the following popular game applications installed on 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
  • 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

Platforms Affected

This worm runs on Windows 98, ME, NT, 2000, XP, and Server 2003.

Analysis By: Zarestel Villanueva Ferrer

Revision History:

First pattern file version: 3.390.04
First pattern file release date: Apr 26, 2006

SOLUTION


Minimum scan engine version needed: 7.500

Pattern file needed: 3.390.04

Pattern release date: Apr 26, 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 98 and ME, press
    CTRL%20ALT%20DELETE
    • On Windows NT, 2000, XP, and Server 2003, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the process:
    MICROSOT32.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 computer.
  4. To check if the malware process has been terminated, close Task Manager, and then open it again.
  5. Close Task Manager.

*NOTE: On computers 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.

On computers running all Windows platforms, if the process you are looking for is not in the list displayed by Task Manager or Process Explorer, continue with the next solution procedure, noting additional instructions. If the malware process is in the list displayed by either Task Manager or Process Explorer, but you are unable to terminate it, restart your computer in safe mode.

Editing the Registry

This malware modifies the computer's registry. Users affected by this malware may need to modify or delete specific registry keys or entries. For detailed information regarding registry editing, please refer to the following articles from Microsoft:

  1. HOW TO: Backup, Edit, and Restore the Registry in Windows 95, Windows 98, and Windows ME
  2. HOW TO: Backup, Edit, and Restore the Registry in Windows NT 4.0
  3. HOW TO: Backup, Edit, and Restore the Registry in Windows 2000
  4. HOW TO: Back Up, Edit, and Restore the Registry in Windows XP and Server 2003

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing at startup.

If the registry entries below are not found, the malware may not have executed as of detection. If so, proceed to the succeeding solution set.

  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 Configuration 77 = "microsot32.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 Configuration 77 = "microsot32.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 Configuration 77 = "microsot32.exe"

Restoring EnableDCOM and RestrictAnonymous Registry Entries

This malware modifies EnableDCOM and RestrictAnonymous registry entries to a certain value. To know more about restoring these registries to their original values, please refer to these articles:

  1. COM security frequently asked questions
  2. How to disable DCOM support in Windows
  3. How to Use the RestrictAnonymous Registry Value in Windows 2000
  4. The "RestrictAnonymous" Registry Value May Break the Trust to a Windows 2000 Domain

To restore this entry to its default value, please perform the following instructions:

  1. Still in the Registry Editor, in the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Ole
  2. In the right panel, locate the entry:
    EnableDCOM = "N"
  3. Right-click on this registry entry and choose Modify. Change the value of this entry to:
    EnableDCOM = "Y"
  4. Close Registry Editor.

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

Scan your computer with Trend Micro antivirus and delete files detected as WORM_RBOT.ENU. To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.

Applying Patches

This worm exploits known vulnerabilities. Download and install the fix patches supplied from the following links:

(Note: The patch link indicated above points to MS03-039, which contains the updated patch for MS03-026.)

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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