WORM_RBOT.OZ

Malware type: Worm

Aliases: Backdoor.Win32.Rbot.aie (Kaspersky), W32/Sdbot.worm.gen.g (McAfee), W32.Spybot.Worm (Symantec), TR/Downloader.Gen (Avira), Mal/Packer (Sophos), Backdoor:Win32/Rbot (Microsoft)

In the wild: No

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 via network shares. It attempts to drop copies of itself in the Admin$ shared folder using a very long list of user names and passwords.

It also has backdoor functionalities. It opens a random port and connects to a specific Web site. It then allows a remote user to perform several malicious commands on a system.

It also steals the CD keys of certain game applications.

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

For additional information about this threat, see:

Description created: Sep. 22, 2004 9:26:52 PM GMT -0800
Description updated: Sep. 22, 2004 9:26:53 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 29,604 Bytes

Initial samples received on: Sep 22, 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 worm drops the following copies of itself in the Windows system folder:

  • DLLSET32.EXE
  • SETDLL32.EXE
  • SSADM32.EXE

It then adds certain entries to the following registry subkeys so that it executes every time Windows starts:

HKEY_CURRENT_USER\Software\Microsoft\
WindowsCurrentVersion\Run

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices

The added registry entries can be any of the following:

  • Microsoft DLLSet32 = �dllset32.exe�
  • Microsoft SetDLL32 = �setdll32.exe�
  • Microsoft DLLSet32 = �dllset32.exe�
  • SS Admin 32 = "ssadm32.exe"

Network Propagation

This worm spreads via network shares. It attempts to drop copies of itself in the Admin$ shared folder using a very long list of common user names and weak passwords.

Backdoor Capabilities

This worm opens a random port and connects to the Web site c.greekpimp.net. It then allows a malicious user to access a system and perform the following tasks:

Denial of Service Attack

This worm performs a denial of service (DoS) attack using the following methods:

  • ICMP
  • SYN
  • UDP

Information Theft

This worm also steals the CD keys of the following game applications:




Analysis by: Dexter See To

Revision History:

First pattern file version: 2.180.00
First pattern file release date: Sep 26, 2004

SOLUTION


Minimum scan engine version needed: 7.500

Pattern file needed: 3.496.01

Pattern release date: Jun 12, 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.OZ.

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micro�s free 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.
    � 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 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.

*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, locate the following registry subkeys:
    • HKEY_LOCAL_MACHINE>Software>Microsoft>
      Windows>CurrentVersion>Run
    • In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>Software>Microsoft>
      Windows>CurrentVersion>Runservices
    • In the left panel, double-click the following:
      HKEY_CURRENT_USER>Software>Microsoft>
      Windows>CurrentVersion>Run
  3. In the right panel, delete the following registry entries if found:
    • Microsoft DLLSet32 = �dllset32.exe�
    • Microsoft SetDLL32 = �setdll32.exe�
    • Microsoft DLLSet32 = �dllset32.exe�
    • SS Admin 32 = "ssadm32.exe"
  4. Close Registry Editor.

NOTE: If you were not able to terminate the malware process 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.OZ. 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.


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