JS_OBFUSCA.SM

October 08, 2012
 Analysis by: Christopher Daniel So
 Modified by: Karl Dominguez
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component. It executes when a user accesses certain websites where it is hosted. It may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

Script

Memory Resident:

No

Initial Samples Received Date:

17 Oct 2010

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It executes when a user accesses certain websites where it is hosted.

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

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

  • {BLOCKED}f.com

Other Details

This Trojan requires the following additional components to properly run:

  • JS_OBFUSCA.SMB

It does the following:

  • Is a part of Web ToolKit used to encode/decode data using base64. This malware is being used in web sites hosting FAKEAV malware

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.551.00

VSAPI OPR PATTERN Date:

19 Oct 2010

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by JS_OBFUSCA.SM

     JS_OBFUSCA.SMB

Step 3

Close all opened browser windows

Step 4

Scan your computer with your Trend Micro product to delete files detected as JS_OBFUSCA.SM. 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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