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Malware type: Trojan

Aliases: W32/Sdbot.worm.gen (McAfee), Trojan.Dropper (Symantec), Troj/Multidr-AW (Sophos),

In the wild: Yes

Destructive: No

Language: English

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

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:


Distribution potential:



When installed, this Trojan drops and executes files in the Windows and Windows system folders.

It connects to an Internet Relay Chat (IRC) server and joins a specific channel, where it listens for certain commands from a remote malicious user, thus gaining virtual control over the affected system.

For additional information about this threat, see:

Description created: May. 11, 2005 3:08:04 AM GMT -0800
Description updated: May. 11, 2005 3:22:52 AM GMT -0800

Minimum scan engine version needed: 6.810

Pattern file needed: 2.677.00

Pattern release date: Jun 8, 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.


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.AB.

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.

  1. Open Windows Task Manager.
    On Windows 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 process:
  3. Select the malware process, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. Repeat the procedure for the following process:
  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.

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 entries:
    • wzxzxds = "fdfddad.exe"
    • ffeqOME = "c:\winnt\system32\vcvsav.exe"
  4. In the left panel, double-click the following:
  5. In the right panel, locate and delete the entries:
    wzxzxds = "fdfddad.exe"
  6. In the left panel, double-click the following:
  7. In the right panel, locate and delete the entries:
    wzxzxds = "fdfddad.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

Scan your system with Trend Micro antivirus and delete files detected as TROJ_RANKY.AB. 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.