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HTML_IEXPL.A

October 09, 2012
 Analysis by: Roland Marco Dela Paz
 ALIASES:

Exploit:JS/Mult.DJ (Microsoft); Exploit:JS/CVE-2012-1889.A (F-Secure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


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

It takes advantage of software vulnerabilities to allow a remote user or malware/grayware to download files.

  TECHNICAL DETAILS

File Size:

5,124 bytes

File Type:

HTML, HTM

Memory Resident:

No

Initial Samples Received Date:

14 Jun 2012

Payload:

Downloads files

Arrival Details

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

Download Routine

This Trojan accesses the following websites to download files:

  • http://j{BLOCKED}e.pl/meeting/su.exe - legitimate Microsoft calc.exe file

It takes advantage of the following software vulnerabilities to allow a remote user or malware/grayware to download files:

  • MS Advisory (2719615) - Vulnerability in Microsoft XML Core Services Could Allow Remote Code Execution

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

Close all opened browser windows

Step 2

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 3

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

Step 4

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.


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