WORM_RBOT.AOA

Malware type: Worm

Aliases: Backdoor.Win32.Rbot.c (Kaspersky), W32/Sdbot.worm.gen (McAfee), W32.Spybot.Worm (Symantec), Worm/SdBot.103424.30 (Avira), Mal/IRCBot-B (Sophos), Backdoor:Win32/Rbot (Microsoft)

In the wild: No

Language: English

Platform: Windows 95, 98, ME, NT, 2000, XP

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

This worm arrives as MDN.EXE on target machines. It spreads by dropping a copy of itself in a list of network shares. If the said shares are inaccessible, it uses a hardcoded list of user names and passwords to gain access.

This worm may also propagate by taking advantage of machines vulnerable to the following Windows exploits:

  • The RPC/DCOM vulnerability, which allows an attacker to gain full access and execute any code on a target machine by sending a malformed packet to the DCOM service. It uses the RPC TCP port 135. More information on this vulnerability is found in Microsoft Security Bulletin MS03-026.

  • The RPC Locator vulnerability, allows an attacker to execute codes on a target machine by sending a malformed packet request to the Locator service. The port related to this exploit is TCP port 445. More information on this vulnerability is found in Microsoft Security Bulletin MS03-001.

  • The Windows LSASS vulnerability, which is a buffer overrun that allows remote code execution and enables a malicious user to gain full control of the affected system. This vulnerability is discussed in detail in Microsoft Bulletin MS04-011 and Trend Micro's Vulnerability Description for MS04-011.

This worm connects to a remote IRC server and joins different channels. It may then execute commands locally on affected machines. It is capable of gathering CD keys of installed games. Furthermore, it terminates a list of processes, which belong to other malware programs.

For additional information about this threat, see:

Description created: Feb. 8, 2005 12:50:43 PM GMT -0800


TECHNICAL DETAILS


Memory resident:  Yes

Size of malware: 103,424 Bytes

Initial samples received on: Feb 9, 2005

Details:

Installation

Upon execution, this worm drops a copy of itself as MDN.EXE in the Windows system folder. The said file's attributes are set to hidden and read-only.

Autostart Techniques

This worm creates the following registry entries to enable its automatic execution every time Windows starts up:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
MDN = "MDN.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\RunServices
MDN = "MDN.exe"

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
MDN = "MDN.exe"

Network Propagation and Exploits

This worm spreads by dropping a copy of itself in the following network shares:

  • ADMIN$
  • C$
  • IPC$

If the said shares are inaccessible, it uses the following list of user names and passwords 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
  • loginpass
  • nokia
  • oeminstall
  • oemuser
  • office
  • oracle
  • orainstall
  • outlook
  • owner
  • pass1234
  • passwd
  • password
  • password1
  • peter
  • qwerty
  • server
  • siemens
  • sqlpassoainstall
  • staff
  • student
  • susan
  • teacher
  • technical
  • win2000
  • win2k
  • win98
  • windows
  • winnt
  • winpass
  • winxp
  • Wwwadmin

This worm may also spread by taking advantage of the following Windows vulnerabilities:

  • The RPC/DCOM vulnerability, which allows an attacker to gain full access and execute any code on a target machine by sending a malformed packet to the DCOM service. It uses the RPC TCP port 135. More information on this vulnerability is found in Microsoft Security Bulletin MS03-026.

  • The IIS/WebDAV vulnerability, which enables arbitrary codes to execute on the WebDAV server by also sending a malformed request packet. This exploit is a service related to the HTTP on port 80. More information about this vulnerability is found in Microsoft Security Bulletin MS03-007.

  • The Windows LSASS vulnerability, which is a buffer overrun that allows remote code execution and enables a malicious user to gain full control of the affected system. This vulnerability is discussed in detail in Microsoft Bulletin MS04-011 and Trend Micro's Vulnerability Description for MS04-011.

Backdoor Capabilities

This worm connects to an IRC server and may join different IRC channels. It eventually executes the said commands, such as the following, locally on affected machines:

  • Change IRC channels, servers, and nicks
  • Flush the DNS cache
  • Download, execute, and send files using FTP, DCC, or UDP
  • Visit certain Web sites
  • Perform a denial of service attack on certain Web sites
  • Logs key presses
  • List processes
  • List logs

Information Theft

This worm steals CD keys of the following games installed on affected machines:

  • 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 2
  • Command and Conquer: Tiberian Sun
  • Counter-Strike
  • 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
  • ommand and Conquer: Red Alert
  • 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

Process Termination

This worm terminates the following processes, which are known to belong to other malware processes:

  • Bagle.v
  • Beagle1
  • Beagle2
  • DameWare
  • DameWare
  • Dcom1025
  • Dcom135
  • Dcom2
  • Dcom445
  • IIS5SSL
  • Kuang2
  • MSBLAST.exe
  • MSSQL
  • Microsoft Inet Xp..
  • MyDoom
  • Mydoom.h
  • NetDevil
  • Netsky.r
  • Optix
  • PandaAVEngine
  • PandaAVEngine.exe
  • Penis32.exe
  • Sasser
  • Sobig.c
  • System MScvb
  • W32.Blaster
  • W32.Blaster.B
  • W32.Blaster.C
  • WKSSVC_Eng
  • WKSSVC_Other
  • WksSvc
  • WksSvc2
  • beagle1
  • beagle2
  • dcom1025
  • dcom135
  • dcom2
  • dcom445
  • iis5ssl
  • kuang2
  • lsass
  • lsass
  • lsass_139
  • lsass_139
  • mscvb32.exe
  • mssql
  • mydoom
  • netdevil
  • optix
  • sasser
  • sysinfo.exe
  • taskmon.exe
  • teekids.exe
  • windows auto update
  • wkssvc
  • wkssvc2
  • wkssvcENG
  • wkssvcOth

Platform

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

Analysis By: Melvin Dantis Dadios


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.398.00

Pattern release date: Feb 9, 2005


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:

AUTOMATIC REMOVAL INSTRUCTIONS

To automatically remove this malware from your system, please use Trend Micro Damage Cleanup Template / Engine.

MANUAL REMOVAL INSTRUCTIONS

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:
    MDN.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 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:
    MDN = "MDN.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:
    MDN = "MDN.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:
    MDN = "MDN.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.

Enabling Show All Files

This procedure allows you to access hidden malware files using Windows Explorer.

� On Windows 95, 98, and NT

  1. Open Windows Explorer. Right-click Start then click Explore.
  2. On the View menu, click Options or Folders Options.
  3. Click the View tab.
  4. Select Show all files, then click OK.

� On Windows ME, 2000, and XP

  1. Open Windows Explorer. Right-click Start then click Explore.
  2. On the Tools menu, click Folder Options.
  3. Click the View tab.
  4. Select Show hidden files and folders, then click OK.

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.AOA. 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 the affected software until the appropriate patch has been installed.




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