WORM_SDBOT.AOE

Malware type: Worm

Aliases: Backdoor.Win32.SdBot.gen (Kaspersky), W32/Sdbot.worm.gen (McAfee), W32.Randex.gen (Symantec), Worm/SdBot.91648 (Avira), W32/Sdbot-TU (Sophos), Backdoor:Win32/Sdbot (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 JAVA2.EXE on target machines. It generates IP addresses and spreads by attempting to drop a copy of itself in target addresses' default shares. If the said shares are inaccessible, it gathers and uses available lists of user names and passwords, which it uses as its login credential to gain access.

It connects to a remote IRC server and joins a specific channel, where it listens for commands from a remote malicious user. The said commands are executed locally on affected machines.

It performs a denial of service attack against target sites using different flood methods. It also steals CD keys, serial numbers, and even application product IDs from a list of software products installed on affected machines.

For additional information about this threat, see:

Description created: Jan. 31, 2005 12:47:45 AM GMT -0800


TECHNICAL DETAILS


Memory resident:  Yes

Size of malware: 91,648 Bytes

Initial samples received on: Jan 29, 2005

Details:

Installation and Autostart

Upon execution, this memory-resident worm drops a copy of itself as JAVA2.EXE in the Windows system folder. It then creates the following autostart entries to ensure its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Jufualt= "java2.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Jufualt = "java2.exe"

Network Propagation

This worm generates IP addresses and spreads by attempting to drop a copy of itself in target addresses' default shares. The said shares are as follows:

  • ADMIN$
  • C$
  • PRINT$
  • IPC$

If the said shares are inaccessible, it uses NetBEUI functions to get available lists of user names and passwords. Successfully dropped copy of this worm is remotely executed as a service.

Backdoor Capabilities

This worm acts as a server program controlled by an IRC bot. It connects to a specific IRC server and joins a specific channel. Once connected, it listens for a list of commands, which it executes locally on affected machines, from a remote malicious user.

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

Exploit

This worm is capable of automatically notifying the bot of systems affected by RPC/DCOM exploit, 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.

This worm scans the network for vulnerable systems and notifies the bot with the vulnerable system's IP address. Using Class B subnet and the infected system's IP address, it generates random IP addresses and tests the system for vulnerability.

Denial of Service

This worm performs a denial of service attack against target sites using any of the following flood methods:

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

Information Theft

This worm steals CD keys, serial numbers, and application product IDs from the following software products installed on affected machines:

  • Battlefield 1942
  • Battlefield 1942 The Road to Rome
  • Battlefield Vietnam
  • Call of Duty
  • CounterStrike
  • FIFA 2003
  • Generals
  • Half-Life
  • IGI 2 Retail
  • IGI 2 Retail
  • Need For Speed Hot Pursuit 2
  • Need For Speed Underground
  • Neverwinter
  • RAVENSHIELD
  • Soldier of Fortune II - Double Helix
  • UEFA EURO 2004
  • UT2003
  • UT2004

Platform

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

Analysis By: Michael Rosario Cortes


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.382.06

Pattern release date: Jan 29, 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:

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_SDBOT.AOE.

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, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    Jufualt= "java2.exe"
  4. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>Run
  5. In the right panel, locate and delete the entry:
    Jufualt= "java2.exe"
  6. 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_SDBOT.AOE. 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 Patch

This malware exploits known vulnerability in Windows. Download and install the fix patch supplied by Microsoft in the following page:

Refrain from using the affected software until the appropriate patch has been installed.




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