Exterminate It! Antimalware


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


Having wasted better part of a day on a Vundo infection, which none of the antivirus/antispyware solutions I normally use came even close to handling (one of them actually compounded the problem due to a partial fix, causing all browsers to seemingly lose connectivity after a few seconds), Exterminate It! fixed it in a single pass and one restart.

Nothing short of perfect. A few dollars very well spent. Thanks again!

Laura G.


Aliases of JS.Istbar (AKA):

[Other]Adware.Istbar, TrojanDownloader.JS/Istbar.AI

How to Remove JS.Istbar from Your Computer^

You can effectively remove JS.Istbar from your computer with Exterminate It!.

After installing the program, run a scan to display a list of the files associated with JS.Istbar 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:

TrojanDownloader.Win32.IstBar.ag, AdMoke, Dadobra.af, Win32.TrojanDownloader.Agent, You.

How Did My PC Get Infected with JS.Istbar?^

The following are the most likely reasons why your computer got infected with JS.Istbar:

  • 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 JS.Istbar. 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 JS.Istbar.

Visiting Questionable Web Sites

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

Detecting JS.Istbar^

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

PC is working very slowly

JS.Istbar 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 JS.Istbar.

New desktop shortcuts have appeared or the home page has changed

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

Annoying popups keep appearing on your PC

JS.Istbar 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

JS.Istbar 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.