Quick Links
  • Save & Share
  • Choose your country:

Malware type: Worm

Aliases: Backdoor.Win32.DsBot.bu (Kaspersky), W32/Sdbot.worm.gen.h (McAfee), W32.Spybot.Worm (Symantec), Worm/SdBot.121344.14 (Avira), Mal/Packer (Sophos), Backdoor:Win32/Rbot (Microsoft)

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:


Distribution potential:



This worm uses NetBEUI functions to get available lists of user names and passwords, which it uses to access a target system and drop a copy of itself in network shares.

It also generates IP addresses and attempts to drop a copy of itself in the following target address's default shares:

  • ADMIN$\System32
  • C$\Windows\System32
  • C$\WINNT\System32
  • IPC$

It takes advantage of the following Windows vulnerabilities:

  • IIS5/WEBDAV Buffer Overflow vulnerability
  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) vulnerability
  • Windows LSASS Vulnerability

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

This worm also has backdoor capabilities. It connects to a remote IRC (Internet Relay Chat) server and joins a specific IRC channel, where it receives commands coming from a malicious user.

It performs the following distributed denial of service (DDoS) attacks:

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

It is also capable of gathering CD keys, serial numbers, and even application product IDs of certain game applications.

It runs on Windows XP and 2000.

For additional information about this threat, see:

Description created: Sep. 15, 2004 6:13:02 AM GMT -0800
Description updated: Sep. 15, 2004 6:37:22 AM GMT -0800

Minimum scan engine version needed: 7.500

Pattern file needed: 3.628.02

Pattern release date: Jul 31, 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.


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.VM.

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micros 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 2000 and XP, press
    CTRL+SHIFT+ESC, 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:
  3. In the right panel, locate and delete the entry:
    msjava service = "xpcd.exe"
  4. In the left panel, double-click the following:
  5. In the right panel, locate and delete the entry:
    msjava service = "xpcd.exe"
  6. In the left panel, double-click the following:
  7. In the right panel, locate and delete the entry:
    msjava service = "xpcd.exe"
  8. 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 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 sets.

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_SDBOT.VM. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micros free online virus scanner.

Applying Patches

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

Refrain from using this product until the appropriate patch has been installed. 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.