Threat Encyclopedia

JS_SHELLCODE.BV

Malware type: JavaScript

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: 

This malicious JavaScript code may be downloaded unknowingly by a user when visiting malicious Web site(s).

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

It is a component of JS_FOXFIR.A. It contains an exploit code that attempts to access a certain website to download a file detected by Trend Micro as WORM_KILLAV.AKN.

For additional information about this threat, see:

Description created: Jul. 20, 2009 7:26:23 PM GMT -0800


TECHNICAL DETAILS


File type: Script

Size of malware: Varies

Initial samples received on: Jul 20, 2009

Related toJS_FOXFIR.A

Payload 1: Downloads files

Details:

This malicious JavaScript code may be downloaded unknowingly by a user when visiting malicious Web site(s).

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

It is a component of JS_FOXFIR.A. It contains an exploit code that attempts to access the following website to download a file detected by Trend Micro as WORM_KILLAV.AKN:

  • http://{BLOCKED}5.cn/e/aa1.exe

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


Analysis By: Jasper Manuel

Revision History:

First pattern file version: 6.436.03
First pattern file release date: Sep 12, 2009

SOLUTION


Minimum scan engine version needed: 8.700

Pattern file needed: 7.553.00

Pattern release date: Oct 19, 2010


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 related to JS_SHELLCODE.BV  

 Step 3: Scan your computer with your Trend Micro product to delete files detected as JS_SHELLCODE.BV and WORM_KILLAV.AKN  

*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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