Malware type: Worm

Aliases: Backdoor.Win32.SdBot.gen (Kaspersky), W32/Sdbot.worm.gen (McAfee), W32.Randex (Symantec), Worm/SdBot.38647 (Avira), W32/Sdbot-Gen (Sophos),

In the wild: Yes

Destructive: No

Language: English

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

Encrypted: Yes

Overall risk rating:

Reported infections:

Damage potential:


Distribution potential:



This worm propagates across the network by dropping copies of itself into several shared folders.

It allows a malicious user to launch a distributed denial of service (DDoS) attack against a target site using SYN flooding method.

It may try to steal CD keys of certain online games that are installed on a system.

For additional information about this threat, see:

Description created: May. 9, 2005 11:49:06 AM GMT -0800
Description updated: May. 9, 2005 11:49:08 AM GMT -0800


Memory resident:  Yes

Size of malware: 38, 647 Bytes

Ports used: Random

Initial samples received on: May 6, 2005

Compression type: DWING


Installation and Autostart Techniques

Upon execution, this worm drops a copy of itself named JXX2.EXE in the Windows system folder.

It adds the following registry entries so that it automatically executes at every system startup:

Jufualt = "jxx2.exe"

Jufualt = "jxx2.exe"

Network Propagation

This worm propagates across the network by dropping copies of itself into the following shared folders:

  • ADMIN$
  • C$
  • D$
  • IPC$
  • PRINT$

It enables malicious users to launch a distributed denial of service (DDoS) attack against a target site using SYN flooding method.

Information Theft

This worm may attempt to steal the CD key of the following games, if they are installed on the system:

  • Battlefield 1942
  • Battlefield 1942 Road To Rome
  • Battlefield Vietnam
  • Call Of Duty
  • Command & Conquer Generals
  • Counter-Strike ( Retail )
  • FIFA 2003
  • Half-Life
  • Need For Speed Hot Pursuit 2
  • Need For Speed Underground
  • Neverwinter
  • Project IGI 2
  • Project IGI 2
  • Rainbow Six III RavenShield
  • Soldier of Fortune II - Double Helix
  • UEFA EURO 2004
  • Unreal Tournament 2003
  • Unreal Tournament 2004

Analysis By: Glenn Paul G. Kimpo


Minimum scan engine version needed: 6.810

Pattern file needed: 2.616.02

Pattern release date: May 6, 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.



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


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.BTG.

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.
    � On Windows 95, 98, and ME, press
    � 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:
  3. In the right panel, locate and delete the entry:
    Jufualt = "jxx2.exe"
  4. In the left panel, double-click the following:
  5. In the right panel, locate and delete the entry:
    Jufualt = "jxx2.exe"
  6. Close Registry Editor.

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 set(s).

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete files detected as WORM_SDBOT.BTG. 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.

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