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JS_DLOADR.AET

November 24, 2012
 Analysis by: Mark Joseph Manahan
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This malware displays images to trick users to falsely update their browsers with a malware.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

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

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

8,818 bytes

File Type:

JS

Initial Samples Received Date:

23 Nov 2012

Payload:

Downloads files, Displays graphics/image

Arrival Details

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

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}browserupdate.com/install.exe

It saves the files it downloads using the following names:

  • {Browser Download Path}\install.exe - detected as TROJ_STARTPA.AET

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

NOTES:

It displays the following images to trick users to falsely update their browsers with malware:

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.544.04

FIRST VSAPI PATTERN DATE:

23 Nov 2012

VSAPI OPR PATTERN File:

9.545.00

VSAPI OPR PATTERN Date:

24 Nov 2012

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove malware/grayware files dropped/downloaded by JS_DLOADR.AET

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_DLOADR.AET. 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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