JS_DROPPER.SMZZ

October 08, 2012
 Analysis by: Karl Dominguez
 PLATFORM:

Windows 2000, XP, 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 may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

HTA

Memory Resident:

Yes

Initial Samples Received Date:

22 Nov 2010

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

It may be downloaded from the following remote sites:

  • http://{BLOCKED}a.com

Installation

This Trojan drops the following files:

  • %System Root%\ProgramData\adhhh\readme.txt - TROJ_HTARUN.PRN

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.640.11

VSAPI PATTERN Date:

22 Nov 2010

VSAPI PATTERN Date:

11/22/2010 12:00:00 AM

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_DROPPER.SMZZ

     TROJ_HTARUN.PRN

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_DROPPER.SMZZ. 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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