Quick Links
  • Save & Share
  • Choose your country:

Malware type: Worm

Aliases: Backdoor.Win32.PoeBot.c (Kaspersky), W32/Sdbot.worm.gen.q (McAfee), W32.IRCBot (Symantec), TR/Crypt.XPACK.Gen (Avira), W32/Poebot-KT (Sophos),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, 2000, XP

Overall risk rating:

Reported infections:

Damage potential:


Distribution potential:



Worms are malicious programs that are able to replicate independently across a network, through email, Instant Messaging applications, or Peer-to-peer (P2P) applications. They do not infect other files on a computer.

This memory-resident worm propagates through network shares. Upon execution, it drops a copy of itself as WINDLL32.EXE in the Windows system folder. It then attempts to place copies of itself into accessible shared folders across a network. It may attempt to use its own compiled list of user names and passwords in order to access shared folders that are password protected.

This worm has backdoor capabilities. It also gathers information such as CD keys, serial numbers and product IDs from certain software applications.

For additional information about this threat, see:

Description created: Jun. 13, 2005 1:19:46 PM GMT -0800

Minimum scan engine version needed: 6.810

Pattern file needed: 4.165.00

Pattern release date: Jan 7, 2007

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.BHD.

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 98 and ME, press
    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.

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

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing at startup.

If the registry entries below are not found, the malware may not have executed as of detection. If so, proceed to the succeeding solution set.

  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:
    Microsoft Windows DLL Services Configuration = "windll32.exe"
  4. In the left panel, double-click the following:
  5. In the right panel, locate and delete the entry:
    Microsoft Windows DLL Services Configuration = "windll32.exe"
  6. In the left panel, double-click the following:
  7. In the right panel, locate and delete the entry:
    Microsoft Windows DLL Services Configuration = "windll32.exe"
  8. 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

Systems infected with this malware can be cleaned by simply scanning for and deleting files detected as WORM_SDBOT.BHD. 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.