Exterminate It! Antimalware


Known threats:700,086 Last Update:March 16, 12:51


Hey Matt,

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Erik R.


Aliases of Downloader.ARR (AKA):

[Other]Win32/Alureon.U, Downloader.Trojan

How to Remove Downloader.ARR from Your Computer^

You can effectively remove Downloader.ARR from your computer with Exterminate It!.

After installing the program, run a scan to display a list of the files associated with Downloader.ARR in the Scan Result screen and remove these files. For information about running scans and removing malware files, see the Exterminate It! Help.


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:

LordZero, ExeHeader, ELF.Siilov, TrojanDownloader.Win32.IstBar.ag, Dyfuca.dm.

How Did My PC Get Infected with Downloader.ARR?^

The following are the most likely reasons why your computer got infected with Downloader.ARR:

  • 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 Downloader.ARR. 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 Downloader.ARR.

Visiting Questionable Web Sites

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

Detecting Downloader.ARR^

The following symptoms signal that your computer is very likely to be infected with Downloader.ARR:

PC is working very slowly

Downloader.ARR 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 Downloader.ARR.

New desktop shortcuts have appeared or the home page has changed

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

Annoying popups keep appearing on your PC

Downloader.ARR 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

Downloader.ARR 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.