WORM_RBOT.AAJ

Malware type: Worm

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 propagates across networks by dropping a copy of itself into accessible network shares. It logs on to a system using a long list of user names and passwords.

It also takes advantage of the following vulnerabilities to spread on accessible systems:

  • Buffer Overflow in SQL Server 2000
  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM)
  • Windows LSASS

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

It opens a random port and connects to an Internet Relay Chat (IRC) server. It then joins an IRC channel to receive several malicious commands.

Moreover, it steals CD keys and product codes of certain game applications. It uses Carnivore network sniffer to retrieve passwords and other sensitive information, and checks for certain strings.

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

For additional information about this threat, see:

Description created: Nov. 2, 2004 12:53:42 AM GMT -0800
Description updated: Nov. 2, 2004 1:33:08 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 114,546 Bytes

Initial samples received on: Nov 2, 2004

Payload 1: Compromises system security

Trigger condition 1: Upon execution

Details:

Installation and Autostart Techniques

Upon execution, this memory-resident worm drops a copy of itself with the file name IASSD.EXE in the Windows system folder. It then attempts to delete itself after execution.

To enable its automatic execution at every system startup, it creates the following registry entries:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Start Upping = "MEDIAPLAYER32.EXE"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices
Start Upping = "MEDIAPLAYER32.EXE"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Start Upping = "MEDIAPLAYER32.EXE"

It also modifies the following registry entries:

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

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

This worm also drops the following files in the CONFIG folder located in the Windows system folder:

These Trojans connect to a remote site, where it downloads an adware and installs it in a target system.

Network Propagation

This worm propagates across networks by dropping a copy of itself into accessible network shares. It logs on using the account of a currently logged on user in an infected system. It may also use a long list of user names and passwords to access the machine.

It searches for the following network shares:

  • ADMIN$
  • C$
  • IPC$

This worm scans for systems with weak logon credentials. It checks the systems for any of the following login names and passwords:

  • 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

Exploits

This worm takes advantage of the Dameware application as well as the following vulnerabilities to propagate on accessible systems:

  • Buffer Overflow in SQL Server 2000
  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM)
  • Windows LSASS

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

It uses Carnivore network sniffer to retrieve passwords and other sensitive information. It checks for the following strings:

Backdoor Capabilities

This worm also has backdoor capabilities. It opens a random port and operates as an Internet Relay Chat (IRC) bot that connects to an IRC server. It then joins an IRC channel where it waits for several commands from a malicious user.

It has the following capabilities:

  • Start or stop a keylogger
  • Redirect TCP and SOCKS4 traffic
  • Provide a remote login shell
  • Download, upload, delete, and execute files
  • Set up an HTTP, TFTP, or FTP file server
  • Steal passwords (including PayPal account information)
  • Capture screenshots.
  • Capture pictures and videos using a Webcam
  • List and kill processes
  • Stop, start, pause, and delete services
  • Open and close vulnerabilities
  • Scan ports for vulnerabilities on other remote machines
  • Send predefined email messages
  • Flush the DNS and ARP caches
  • Shut down and restart system
  • Add and delete network shares, groups, and users
  • Sniff network traffic for passwords

Denial of Service Attack

This worm is capable of launching a denial of service (DoS) attack using the following methods:

  • ICMP flood
  • PING flood
  • SYN flood
  • TCP flood
  • UDP flood

Information Theft

This worm steals the CD keys and product codes of the following popular game applications:

  • 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
  • Microsoft Windows Product ID
  • 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



Analysis by: Juan Cesar Cuevas


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.229.04

Pattern release date: Nov 2, 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:

Please refer to the malware reports of TROJ_ISTZONE.B and TROJ_ISTZONE.H for their manual removal 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:
    Start Upping = "MEDIAPLAYER32.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:
    MicrosofStart Upping = "MEDIAPLAYER32.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:
    Start Upping = "MEDIAPLAYER32.EXE"
  8. Close Registry Editor.

Restoring Modified Entries from the Registry

  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>Ole
  3. In the right panel, locate and change the entry or entries into the following value:
    EnableDCOM = "Y"
  4. Close Registry Editor.

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

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

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.AAJ, TROJ_ISTZONE.B and TROJ_ISTZONE.H. 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. Refrain from using this product until the appropriate patch has been installed. Trend Micro advises users to download critical patches upon release by vendors from the following links:




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