TROJ_DELF.KAQ

Malware type: Trojan

Aliases: Trojan.Win32.Delf.aed (Kaspersky), W32/Sdbot.worm.gen.ax (McAfee), W32.Spybot.Worm (Symantec), TR/Delf.aed (Avira), VirTool:Win32/DelfInject.gen!D (Microsoft)

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, NT, 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

Medium

Distribution potential:

Low

Description: 

This Trojan is downloaded unknowingly by a user when visiting malicious Web sites.

It drops files detected by Trend Micro as WORM_SDBOT.FXZ. As a result, routines of the dropped malware are also exhibted on the affected system.

For additional information about this threat, see:

Description created: Aug. 28, 2007 8:35:02 PM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 85,504 Bytes

Initial samples received on: Aug 27, 2007

Details:

Arrival and Installation

This Trojan is downloaded unknowingly by a user when visiting malicious Web sites.

It drops the following copy of itself:

  • %Windows%\firefoxpgm.exe

It also drops the following files, which are all detected by Trend Micro as WORM_SDBOT.FXZ:

  • %Windows%\img301.zip
  • %Windows%\img4851.zip
  • %Windows%\windrivers.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Autostart Techniques

This Trojan creates the following registry entry to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
Firefox Plugin Manager = "firefoxpgm.exe"

Affected Platforms

This Trojan runs on Windows 98, ME, NT, 2000, XP, and Server 2003.

Analysis By: Arianne Krishna Valle


SOLUTION


Minimum scan engine version needed: 8.000

Pattern file needed: 4.675.00

Pattern release date: Aug 27, 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.

Solution:

Terminating the Malware Process

This procedure terminates the running malware process.

  1. Open Windows Task Manager.
    • On Windows 98 and ME, press
    CTRL%20ALT%20DELETE
    • On Windows NT, 2000, XP, and Server 2003, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the process:
    firefoxpgm.exe
  3. Select the malware process, then press either the End Task or the End Process button, depending on the version of Windows on your computer.
  4. To check if the malware process has been terminated, close Task Manager, and then open it again.
  5. Close Task Manager.

*NOTE: On computers 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.

If the process you are looking for is not in the list displayed by Task Manager or Process Explorer, continue with the next solution procedure. If the malware process is in the list displayed by either Task Manager or Process Explorer, but you are unable to terminate it, restart your computer in safe mode.

Removing Autostart Entry from the Registry

This solution deletes registry entries added by this malware. Before performing the steps below, make sure you know how to back up the registry and how to restore it if a problem occurs. Refer to this Microsoft article for more information about modifying your computer's registry.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    Firefox Plugin Manager = �firefoxpgm.exe"
  4. Close Registry Editor.

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

Scan your computer with Trend Micro antivirus and delete files detected as TROJ_DELF.KAQ and WORM_SDBOT.FXZ. To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.




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