Threat Encyclopedia

JS_DLOADER.AP

Malware type: JavaScript

Aliases: Exploit.HTML.IESlice.gx (Kaspersky), Downloader (Symantec), HTML/Shellcode.Gen (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 script that takes advantage of a vulnerability in the Lianzong Game Platform. More information on the said vulnerability can be found in the following Web site:

Once successfully exploited, it downloads a file from a certain URL. The said file is then executed on the affected system. 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. 17, 2008 11:04:23 PM GMT -0800


TECHNICAL DETAILS


File type: Script

Size of malware: 3,516 Bytes

Initial samples received on: May 15, 2008

Payload 1: Downloads files

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 script that takes advantage of a vulnerability in the Lianzong Game Platform. More information on the said vulnerability can be found in the following Web site:

It exploits the vulnerability that exists in the file HanGamePluginCn18.Dll, causing a buffer overflow. Once successfully exploited, it downloads a file detected by Trend Micro as BKDR_HUPIGON.CYH from the URL http://{BLOCKED}8.com/ms.exe. The said file is then executed on the affected system. 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: 5.280.29
First pattern file release date: May 17, 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.AP 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 the vendor. Refrain from using this product until the appropriate patch has been installed. Trend Micro advises users to download critical patches upon release by vendors.




Trend Micro offers best-of-breed antivirus and content-security solutions for your corporate network, small and medium business, mobile device or home PC.

Featured Stories

Connect with us on