Threat Encyclopedia

JS_ELECOM.SMA

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:

High

Distribution potential:

Medium

Description: 

This JavaScript malware may be downloaded unknowingly by a user when visiting malicious Web sites. It may be hosted on a Web site and run when a user accesses the said Web site. It may be downloaded from remote sites by JS_ELECOM.C.

It refers to its component file, which Trend Micro detects as JS_ELECOM.SMB, for its data variables.

This script takes advantage of a specific vulnerability in Microsoft Internet Explorer (IE), which could allow remote code execution. More information regarding this vulnerability can be found at the following link:

Upon successfully exploiting the said vulnerability, it attempts to connect to a malicious site to download and execute a file. Trend Micro detects the downloaded file as TROJ_HYDRAQ.SMA. As a result, routines of the downloaded Trojan are also exhibited on the affected system.

It also downloads TROJ_HYDRAQ.K and TROJ_COMELE.AJ.

Read more about this threat incident in the Malware Blog entry "New IE Zero-Day Exploit Attacks Continue."

For additional information about this threat, see:

Description created: Jan. 21, 2010 1:05:27 AM GMT -0800


TECHNICAL DETAILS


File type: Script

Size of malware: Varies

Initial samples received on: Jan 19, 2010

Vulnerability used:  Microsoft Internet Explorer DOM Operation Memory Corruption Vulnerability (979352)

Related toJS_ELECOM.C, JS_ELECOM.SMB, TROJ_HYDRAQ.SMA, TROJ_HYDRAQ.K, TROJ_COMELE.AJ

Details:

Arrival Details

This JavaScript (JS) malware 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 may be downloaded from remote site(s) by the following malware:

Download Routine

This script malware refers to its component file, WHAT.JPG, for its data variables. which Trend Micro detects as JS_ELECOM.SMB.

This script takes advantage of a specific vulnerability in Microsoft Internet Explorer (IE), which could allow remote code execution. More information regarding this vulnerability can be found at the following link:

Upon successfully exploiting the said vulnerability, it attempts to connect to several malicious sites, such as the ones below, to download and execute a file:

  • http://ssystem32.{BLOCKED}22.org:8277/down.css
  • http://teepsnp.{BLOCKED}22.org:8277/log.css

It then saves the downloaded file as the following:

  • %Application Data%\{random letter}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Trend Micro detects the downloaded file as TROJ_HYDRAQ.SMA. As a result, routines of the downloaded Trojan are also exhibited on the affected system.

It also downloads TROJ_HYDRAQ.K and TROJ_COMELE.AJ.

Affected Platforms

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

Analysis By: Jessa De La Torre

Revision History:

First pattern file version: 6.792.02
First pattern file release date: Jan 21, 2010

SOLUTION


Minimum scan engine version needed: 8.900

Pattern file needed: 7.597.00

Pattern release date: Nov 5, 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_ELECOM.SMA  

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

*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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