Threat Encyclopedia

HTML_DLOADER.AS

Malware type: Html

Aliases: No Alias Found

In the wild: Yes

Destructive: No

Language: English

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

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

Medium

Description: 

To get a one-glance comprehensive view of the behavior of this malware, refer to the Behavior Diagram shown below.

HTML_DLOADER.AS Behavior Diagram

Malware Overview

This malicious HTML file may be downloaded from remote site(s) by the following malware:

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

It accesses Web sites to download a certain file which is detected by Trend Micro as BKDR_AGENT.XZMS.

It takes advantage of the following software vulnerability(ies), which allows a remote malicious user or malware to download files on the affected system:

For additional information about this threat, see:

Description created: Feb. 16, 2009 9:43:38 PM GMT -0800


TECHNICAL DETAILS


File type: Script

Size of malware: 9,892 Bytes

Initial samples received on: Feb 11, 2009

Related toBKDR_AGENT.XZMS

Payload 1: Downloads files

Details:

Arrival Details

This malicious HTML file may be downloaded from remote site(s) by the following malware:

It may be downloaded from the following remote site(s):

  • http://www.{BLOCKED}itj.com/bbs/images/alipay/mm/jc/jc.html

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

Download Routine

This malicious HTML file accesses Web sites to download the following file(s) which is detected as BKDR_AGENT.XZMS:

  • http://www.{BLOCKED}itj.com/bbs/images/alipay/mm/jc/jc.exe

It takes advantage of the following software vulnerability(ies), which allows a remote malicious user or malware to download files on the affected system:

Affected Platforms

This malicious HTML file runs on Windows 98, ME, NT, 2000, XP, Server 2003.


Analysis By: John Symelle Ortiz Luis

Updated By: John Symelle Ortiz Luis


SOLUTION


Minimum scan engine version needed: 8.700

Pattern file needed: 5.835.00

Pattern release date: Feb 11, 2009


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:

For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.


 Step 1: Close all opened browser windows 

 

 Step 2: Remove malware files dropped/downloaded by HTML_DLOADER.AS

 

 Step 3: Scan your computer with your Trend Micro product to delete files detected as HTML_DLOADER.AS

*Note: If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

 

 Step 4:  Download and apply these security patches  

*Note: Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.

 
 



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