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Malware type: Trojan

Aliases: Proxy-FBSR (McAfee), Backdoor.Ranky (Symantec), TR/Proxy.Ranky.AP (Avira), Troj/Ranck-BL (Sophos),

In the wild: Yes

Destructive: No

Language: English

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

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:


Distribution potential:



This memory-resident Trojan runs an HTTP proxy server on a randomly chosen port. The port number is reported to the following Web sites:

  • http://vemens.info/a.php?
  • http://fudgerightnowd.dynalias.net/a.php?
  • http://dnsme.mine.nu/a.php?
  • http://www.nexdecade.com/public_html/a.php?

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

For additional information about this threat, see:

Description created: Dec. 23, 2004 10:07:30 AM GMT -0800
Description updated: Dec. 23, 2004 10:17:48 AM GMT -0800

Minimum scan engine version needed: 6.810

Pattern file needed: 5.419.00

Pattern release date: Jul 20, 2008

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 TROJ_RANKY.BD.

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 95, 98, and ME, press
    On Windows NT, 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 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:
    Bwddwss = "%current folder%\<malware name>"
    (Note: %current folder% is the location where the Trojan is executed.)
  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 TROJ_RANKY.BD. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other users can use HouseCall, Trend Micros 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.