WORM_RBOT.AHI

Malware type: Worm

Aliases: W32/Sdbot.worm!MS06-040 (McAfee), W32.IRCBot (Symantec), Worm/SdBot.187392.5 (Avira), W32/Rbot-FKR (Sophos),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

This worm spreads via network shares. It uses NetBEUI functions to get available lists of user names and passwords from an affected system. It uses these user names and passwords to access remote systems in the network.

It also uses a list of user names and passwords apart from those that it gathers. It then drops copies of itself into certain network shares of successfully accessed systems.

This worm also exploits the following Windows vulnerabilities to propagate across networks:

  • IIS/WebDAV vulnerability
  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability
  • LSASS vulnerability

More information on these vulnerabilities can be found on the following Web pages:

This worm has backdoor capabilities. It connects to a remote IRC server and joins a specific IRC channel, where it receives commands coming from a remote malicious user. It executes these commands locally on an affected system, providing the remote user virtual control over the system.

It is capable of launching denial of service attack against a target site. It is also capable of stealing the Microsoft Windows product ID, as well as the CD keys of certain game applications.

This worm runs on Windows 2000 and XP.

For additional information about this threat, see:

Description created: Jan. 11, 2005 9:43:17 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 131,072 Bytes

Initial samples received on: Jan 11, 2005

Variant ofWORM_RBOT.GEN

Payload 1: Compromises system security

Payload 2: Launches DoS attacks

Payload 3: Steals Windows product ID and CD keys

Details:

Arrival and Installation

This memory-resident worm may arrive via network shares. Upon execution, it drops a copy of itself in the Windows system folder as MSCL32.EXE.

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

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\Run
MSWindows SysCl = "mscl32.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\RunServices
MSWindows SysCl = "mscl32.exe"

It also creates this registry entry as an infection marker:

HKEY_LOCAL_MACHINE\Software\Microsoft\Ole
MSWindows SysCl = "mscl32.exe"

Network Propagation and Exploits

This worm spreads via network shares. It uses NetBEUI functions to get available lists of user names and passwords from an affected system. It uses these user names and passwords to access remote systems in the network.

It also uses the following list of user names and passwords apart from those that it gathers:

  • 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

It then drops copies of itself into the following network shares of successfully accessed systems:

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

It remotely executes every successfully dropped copy of itself as a service.

This worm also exploits the following Windows vulnerabilities to propagate across networks:

  • IIS/WebDAV vulnerability
  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability
  • LSASS vulnerability

More information on these vulnerabilities can be found on the following Web pages:

Backdoor Capabilities

This worm has backdoor capabilities. It connects to a remote IRC server and joins a specific IRC channel, where it receives commands coming from a remote malicious user, such as the following:

  • Change IRC server and channel where it connects to
  • Download and execute files
  • Flush DNS cache
  • Add or remove default network shares
  • Enable DCOM protocol
  • Get system information, such as CPU speed, free memory, uptime, and free disk space
  • Delete files
  • Emulate an FTP server
  • List and terminate services and processes
  • Scan local area network for listening ports
  • Emulate a proxy server
  • Redirect connections
  • Log keystrokes

Denial of Service attack

This worm is capable of launching denial of service attack against a target site using the following methods:

  • HTTP flood
  • Ping flood
  • SYN flood
  • UPD flood

Information Theft

This worm is capable of stealing the Microsoft Windows product ID, as well as the CD keys of the following games:

  • 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



Analysis by: Raymond Richard Gamboa

Revision History:

First pattern file version: 2.342.04
First pattern file release date: Jan 11, 2005

SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 3.737.00

Pattern release date: Sep 10, 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:

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.AHI.

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micro�s 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:
    MSWindows SysCl = "mscl32.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:
    MSWindows SysCl = "mscl32.exe"

NOTE: If you were not able to terminate the malware process as described in the previous procedure, restart your system.

Removing Other Entries from the Registry

  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 and delete the entry:
    MSWindows SysCl = "mscl32.exe"
  3. Close Registry Editor.

Additional Windows XP Cleaning Instructions

Users running Windows XP must disable System Restore to allow full scanning of infected systems.

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

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_RBOT.AHI. 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 online virus scanner.

Applying Patches

This malware exploits known vulnerabilities in Windows. Download and install the fix patches from the following Microsoft Web pages:

Trend Micro advises users to download critical patches upon release by vendors.


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