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JS_OBFUSCAT.SMD

October 08, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

VirTool:JS/Obfuscator.V (Microsoft), Trojan.Malscript!html (Symantec), JS/Redirector.v (McAfee), JS.Crypt.2 (DrWeb), JS.Agent-84 (ClamAV), JS/Obfuscated (AVG)

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW


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

It inserts an IFRAME tag that redirects users to certain URLs.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

Script

Memory Resident:

No

Initial Samples Received Date:

17 Sep 2010

Arrival Details

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

Other Details

This Trojan inserts an IFRAME tag that redirects users to the following URLs:

  • http://{BLOCKED}others.com/articles/styles.php?s=uXKc3WOX3&id={random number}

It does the following:

  • It loads and executes the applet from http://{BLOCKED}others.com/articles/styles.php?s=uXKc3WOX3&id=6.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.610.01

VSAPI PATTERN Date:

10 Nov 2010

VSAPI PATTERN Date:

11/10/2010 12:00:00 AM

FIRST VSAPI PATTERN FILE:

7.470.05

FIRST VSAPI PATTERN DATE:

18 Sep 2010

NOTES:

Trend customers:

    Keep your pattern and scan engine files updated. Trend Micro antivirus software can clean or remove most types of computer threats. Malware, though, such as Trojans, scripts, overwriting viruses and joke programs which are identified as uncleanable, should simply be deleted.

All Internet users:

  • Use HouseCall - the Trend Micro online threat scanner to check for malware that may already be on your PC.
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