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JS_OBFUSCA.YT

October 09, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Trojan.Malscript (Symantec)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW


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

It contains errors in its code. This stops it from performing its routines.

  TECHNICAL DETAILS

File Size:

6,849 bytes

File Type:

HTML, HTM

Initial Samples Received Date:

23 Jun 2012

Arrival Details

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

Other Details

This Trojan contains errors in its code. This stops it from performing its routines.

NOTES:

This Trojan attempts to decrypt the encrypted code in the malware body but the decrypted code contains garbage values.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.212.01

FIRST VSAPI PATTERN DATE:

23 Jun 2012

VSAPI OPR PATTERN File:

9.213.00

VSAPI OPR PATTERN Date:

24 Jun 2012

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

Close all opened browser windows

Step 3

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