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JS_EXPLT.QYUA

October 09, 2012
 Analysis by: rolandde
 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


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

  TECHNICAL DETAILS

File Size:

231 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

25 Jan 2012

Arrival Details

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

It may be downloaded from the following remote sites:

  • http://{BLOCKED}s.{BLOCKED}p.com/is.js

NOTES:

It is a component of a malware which Trend Micro detects as HTML_EXPLT.QYUA which leverages CVE-2012-0003:

It aids in decrypting the shellcode embedded in the body of HTML_EXPLT.QYUA. As a result, malicious payload of HTML_EXPLT.QYUA are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.732.07

FIRST VSAPI PATTERN DATE:

25 Jan 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

Close all opened browser windows

Step 3

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.   http://technet.microsoft.com/en-us/security/bulletin/ms12-004

Step 4

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