Exterminate It! Antimalware

malpedia

Known threats:700,085 Last Update:March 01, 12:55

Testimonials

Matt,

Thanks so much for your help. For now, this seemed to have solved the problem and found all the infected files. I'll keep you updated, as I know this virus can be very hard to kill.

Thanks a million.

Jason

Dyfuca

Aliases of Dyfuca (AKA):

[Kaspersky]TrojanDownloader.Win32.Dyfuca.bw, TrojanDownloader.Win32.Dyfuca.cn, TrojanDownloader.Win32.Dyfuca.dc, Trojan-Downloader.Win32.Dyfuca.dp, TrojanDownloader.Win32.Dyfuca.gen
[Eset]Win32/TrojanDownloader.Dyfica.NAB trojan, Win32/TrojanDownloader.Dyfica.NAC trojan
[Panda]Spyware/Dyfuca, Spyware/SafeSurf
[CA]Win32/Dyfuca.r!Downloader
[Other]Trojan-Downloader.Win32.Dyfuca.ei

How to Remove Dyfuca from Your Computer^

To completely purge Dyfuca from your computer, you need to delete the files and folders associated with Dyfuca. These files and folders are respectively listed in the Files and Folders sections on this page.

For instructions on deleting the Dyfuca files and folders, see the following section How to Delete Dyfuca Files (.exe, .dll, etc.).

How to Delete Dyfuca Files (.exe, .dll, etc.)^

The files and folders associated with Dyfuca are listed in the Files and Folders sections on this page.

To delete the Dyfuca files and folders:

  1. Using your file explorer, browse to each file and folder listed in the Folders and Files sections.
  2. Note: The paths use certain special folders (conventions) such as [%PROGRAM_FILES%]. Please note that these conventions are depending on Windows Version / Language. These conventions are explained here.
  3. Select the file or folder and press SHIFT+Delete on the keyboard.
  4. Click Yes in the confirm deletion dialog box.
  5. IMPORTANT: If a file is locked (in use by some application), its deletion will fail (the Windows will display a corresponding message).You can delete such locked files with the RemoveOnReboot utility. To delete a locked file, right-click on the file, select Send To->Remove on Next Reboot on the menu and restart your computer. You can install the RemoveOnReboot utility from here.

Trojan

A trojan is a program that is disguised as legitimate software but is designed to carry out some harmful actions on the infected computer.

Unlike viruses and worms, trojans don’t replicate but they can be just as destructive.

These days trojans are very common. Trojans are divided into a number different categories based on their function or type of damage.

Be Aware of the Following Trojan Threats:

InfoSiko, Gadhut, Pigeon.AHR, Bancos.HZT, Pigeon.AVDE.

BHO

Browser Helper Object, or BHO, is a dynamic link library (DLL) that runs whenever Internet Explorer is started. Generally, BHOs are included in installation of third-party programs where they are offered as enhancements of the browser functionality. For example, many Internet Explorer plug-ins are in essence BHOs.

BHOs can be installed silently or “legitimately” when a user fails to read the fine print included in the freeware program’s EULA (End User License Agreement).

Because BHOs are small programs, they can do anything that other programs can do. It’s not easy to detect the BHOs installed on the computer. This enables hackers and other malevolent users to employ the BHO functionality in their interests, for example, secretly install adware programs or gather various statistics on the user’s browsing trends.

Be Aware of the Following BHO Threats:

Qcbar.AdultLinks, Httper, ClientMan.Helper, NPBH.dll, Trojan.

Downloader

A type of trojan. The primary purpose of downloaders is to install malicious code on a user’s computer. However, they can enable other malicious uses. For example, they can be used to continually download new versions of malicious code, adware, or “pornware.” They are also used frequently used to exploit the vulnerabilities of Internet Explorer.

Downloaders are typically written in script languages such as VBS or JavaScript.

Be Aware of the Following Downloader Threats:

Twin, Small.fr, James, Small.xp, Brainy.

How Did My PC Get Infected with Dyfuca?^

The following are the most likely reasons why your computer got infected with Dyfuca:

  • Your operating system and Web browser's security settings are too lax.
  • You are not following safe Internet surfing and PC practices.

Downloading and Installing Freeware or Shareware

Small-charge or free software applications may come bundled with spyware, adware, or programs like Dyfuca. Sometimes adware is attached to free software to enable the developers to cover the overhead involved in created the software. Spyware frequently piggybacks on free software into your computer to damage it and steal valuable private information.

Using Peer-to-Peer Software

The use of peer-to-peer (P2P) programs or other applications using a shared network exposes your system to the risk of unwittingly downloading infected files, including malicious programs like Dyfuca.

Visiting Questionable Web Sites

When you visit sites with dubious or objectionable content, trojans-including Dyfuca, spyware and adware, may well be automatically downloaded and installed onto your computer.

Detecting Dyfuca^

The following symptoms signal that your computer is very likely to be infected with Dyfuca:

PC is working very slowly

Dyfuca can seriously slow down your computer. If your PC takes a lot longer than normal to restart or your Internet connection is extremely slow, your computer may well be infected with Dyfuca.

New desktop shortcuts have appeared or the home page has changed

Dyfuca can tamper with your Internet settings or redirect your default home page to unwanted web sites. Dyfuca may even add new shortcuts to your PC desktop.

Annoying popups keep appearing on your PC

Dyfuca may swamp your computer with pestering popup ads, even when you're not connected to the Internet, while secretly tracking your browsing habits and gathering your personal information.

E-mails that you didn't write are being sent from your mailbox

Dyfuca may gain complete control of your mailbox to generate and send e-mail with virus attachments, e-mail hoaxes, spam and other types of unsolicited e-mail to other people.