F-Secure Virus Descriptions : Java/Binny.A

Summary

Java/Binny.A is a Java applet trojan that uses vulnerability in SUN Java Runtime to gain full access to system and drops TrojanDownloader.Win32.Small.VQ.

Binny.A infects system through Java web browser plug-in, when a web browser visits a malicious web page that contains reference to trojan file.

Binny.A is otherwise quite similar to any other Java Applet trojans, except that it uses vulnerability in Sun Java Runtime, not Microsoft Runtime like other similar trojans do.

If you have Java Runtime that is older than 1.41_04 please upgrade it.

Sun Advisory about the Java Runtime vulnerability:

http://sunsolve.sun.com/search/document.do?assetkey=1-26-57221-1&searchcl...

As Binny.A uses Sun Java Runtime, it affects all web browsers not just Internet Explorer. At least Mozilla, Mozilla Firefox and Opera are affeted when user browses web with Java enabled and using unpatched Java runtime.

Disinfection

Manual Disinfection

Upgrade your Java Runtime by installing J2SE v 1.4.2_05 JRE from http://java.sun.com/j2se/1.4.2/download.html

1. Open Control panel and click Java Plug-in icon

2. Select 'cache' tab and click 'clear' button

3. Scan your hard-drives for any additional trojans and other malware

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Detailed Description

Installation to system

Java/Binny.A is downloaded to system through malicious web page that has the Java Applet in applet or object tag. When web browser has downloaded the Binny.A it gives it to Sun Java Runtime for execution.

When Sun Java Runtime tries to execute the Binny.A uses tries to use vulnerability to escalate it's privileges so that it can create files and execute them.

If the Java Runtime is vulnerable the Binny.A drops TrojanDownloader.Win32.Small.VQ and executes it.

Spreading in

Malicious web pages that use the Binny.A trojan to attack users web browser and Java runtime.

Payload

When executed Binny.A drops TrojanDownloader.Win32.Small.VQ

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Detection

Detection for this malware was published on September 21, 2004 in the following F-Secure Anti-Virus update:

[FSAV_Database_Version]

Version=2004-09-21_02

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Write-up: Jarno Niemela, September 21, 2004;

F-Secure Corporation