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JS_SHELLCOD.JON

October 08, 2012
 Analysis by: Kathleen Notario
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  TECHNICAL DETAILS

File Size:

Varies

File Type:

Script

Memory Resident:

Yes

Initial Samples Received Date:

11 Sep 2010

Payload:

Downloads files

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It contains an iframe tag that points to the following URL: http://{BLOCKED}.com/10/umi.php - also detected as JS_SHELLCOD.JON
  • Once this URL is accessed, it connects to the following site: http://rchfs.com/10/nuspc.php.
  • It then redirect the user to http://www.google.com to hide its execution.
  • It also downloads the following script: http://{BLOCKED}.com/10/zjxjw.js - also detected as JS_SHELLCOD.JON. This may lead to redirection to other compromised URLs or to download possibly malicious file(s).

  SOLUTION

Minimum Scan Engine:

8.900

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 JS_SHELLCOD.JON. 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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