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Threat Encyclopedia

JS_DLOADER.UOW

Malware type: JavaScript

Aliases: HEUR/Exploit.HTML (Avira),

In the wild: Yes

Destructive: No

Language: English

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

Encrypted: Yes

Overall risk rating:

Reported infections:

Damage potential:

Medium

Distribution potential:

Low

Description: 

This JavaScript may be hosted on a Web site and run when a user accesses the said Web site.

It is a specially crafted HTML scripts that takes advantage of a vulnerability in Microsoft Data Access components to allow code execution. More information on the said vulnerability can be found in the following Web page:

It then downloads and executes a file from a certain URL. As a result, malicious routines of the downloaded file may be exhibited on the affected system.

For additional information about this threat, see:

Description created: May. 18, 2008 12:54:30 AM GMT -0800


TECHNICAL DETAILS


File type: Script

Memory resident:  No

Size of malware: 2,553 Bytes

Initial samples received on: May 15, 2008

Details:

This JavaScript may be hosted on a Web site and run when a user accesses the said Web site.

It is a specially crafted HTML scripts that takes advantage of a vulnerability in Microsoft Data Access components to allow code execution. More information on the said vulnerability can be found in the following Web page:

It then downloads and executes a file detected by Trend Micro as BKDR_HUPIGON.CYH from http://{BLOCKED}8.com/ms.exe once it has exploited the said vulnerability. As a result, malicious routines of the downloaded file may be exhibited on the affected system.

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

Analysis By: Joselito Dela Cruz

Revision History:

First pattern file version: 5.280.30
First pattern file release date: May 18, 2008

SOLUTION


Minimum scan engine version needed: 8.300

Pattern file needed: 5.281.00

Pattern release date: May 18, 2008


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:

Note: Close all instances of Internet Explorer before proceeding with the following solution.

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 JS_DLOADER.UOW and BKDR_HUPIGON.CYH. 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.

Applying Patch

This malware exploits a known vulnerability. Download and install the fix patch supplied by Microsoft. Refrain from using this product until the appropriate patch has been installed. Trend Micro advises users to download critical patches upon release by vendors.




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