Analysis by: Jasen Sumalapao
ALIASES:

Trojan-Downloader.JS.Agent.gtt, Trojan-Downloader.JS.Agent.gtt (Kaspersky), Trojan-Downloader.JS.Agent (Ikarus)

 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

Infection Channel: Downloaded from the Internet

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

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

  TECHNICAL DETAILS

File Size: 5,413 bytes
File Type: HTML, HTM, JS
Initial Samples Received Date: 27 Aug 2012
Payload: Downloads files

Arrival Details

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

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

It may be downloaded from the following remote sites:

  • http://ok.{BLOCKED}4.net/meeting/index.html
  • http://{BLOCKED}.{BLOCKED}.104.149/public/meeting/index.html

Download Routine

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

  • http://{BLOCKED}.{BLOCKED}.104.149/public/meeting/applet.jar - detected as JAVA_GONDY.A
  • http://{BLOCKED}.{BLOCKED}.104.149/public/meeting/Flash_update.exe - detected as BKDR_POISON.BLW

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

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.352.01
FIRST VSAPI PATTERN DATE: 27 Aug 2012
VSAPI OPR PATTERN File: 9.353.00
VSAPI OPR PATTERN Date: 28 Aug 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

Remove malware/grayware files dropped/downloaded by JS_FIEROPS.A

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_FIEROPS.A. 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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