Analysis by: Jaime Benigno Reyes
ALIASES:

HEUR:Trojan.Script.Generic (Kaspersky); JS/Clicker (AhnLab)

 PLATFORM:

Windows

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

  • 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.

  TECHNICAL DETAILS

File Size: 13,695 bytes
File Type: Script
Initial Samples Received Date: 20 Mar 2015

Arrival Details

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

Other Details

This Trojan requires the existence of the following files to properly run:

  • {web address where it is hosted}/swfobject.js
  • {web address where it is hosted}/jquery-1.4.2.min.js

It does the following:

  • It connects to the following URL to load a malicious web page:
    • {web address where it is hosted}/main.html - detected as VBS_OLEAR.C
  • It connects to the following URLs to play possibly malicious Adobe Flash files:
    • {web address where it is hosted}/footer.swf
    • {web address where it is hosted}/logo.swf
  • It connects to the following URL to execute a possibly malicious Java class file:
    • {web address where it is hosted}/dvpsetup.class
  • It connects to the non-malicious site http://count7.51yes.com/click.aspx?id=72296135&logo=8 to display a logo with hyperlink to http://count7.51yes.com/click.aspx?id=72296135 to trick users that it is a legitimate web page.

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.562.03
FIRST VSAPI PATTERN DATE: 26 Mar 2015
VSAPI OPR PATTERN File: 11.563.00
VSAPI OPR PATTERN Date: 27 Mar 2015

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

Close all opened browser windows

Step 3

Remove malware/grayware files dropped/downloaded by JS_KAIXIN.A. (Note: Please skip this step if the threats listed below have already been removed.)

     
    • VBS_OLEAR.C

Step 4

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