Threat Encyclopedia

HTML_JSREDIR.AE

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:

Medium

Distribution potential:

Low

Description: 

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

HTML_JSREDIR.AE Behavior Diagram

Malware Overview

This HTML has received attention from independent media sources and/or other security firms.

This is a Trend Micro detection for compromised HTML pages by the insertion of an encrypted malicious Javascript. The script checks for the affected system's Web Browser and its version. It then generates a random string based on the version.

It then connects to the generated URL to possibly download other malicious files.

For additional information about this threat, see:

Description created: May. 20, 2009 1:39:22 AM GMT -0800


TECHNICAL DETAILS


File type: HTML

Size of malware: Varies

Initial samples received on: May 18, 2009

Payload 1: Downloads files

Details:

This is a Trend Micro detection for compromised HTML pages by the insertion of an encrypted malicious Javascript. The script checks for the affected system's Web Browser and its version. It then generates a random string based on the version. The random string in appended to the following URL:

  • http://{BLOCKED}mblar.cn/rss/?id=

The resulting URL appears as follows:

  • http://{BLOCKED}mblar.cn/rss/?id={Generated string}

It then connects to the generated URL to possibly download other malicious files. This malicious HTML script runs on Windows 98, ME, NT, 2000, XP, and Server 2003.

Analysis By: Karl Dominguez


SOLUTION


Minimum scan engine version needed: 8.700

Pattern file needed: 6.137.00

Pattern release date: May 18, 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: Scan your computer with your Trend Micro product to delete files detected as HTML_JSREDIR.AE  

*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.




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