Analysis by: Roland Marco Dela Paz

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW


This JavaScript malware connects to certain sites in order to execute malicious codes. As a result, malicious routines of the executed malware are exhibited on the infected system.

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

  TECHNICAL DETAILS

File Size: 73,773 bytes
File Type: Script
Initial Samples Received Date: 28 Apr 2011
Payload: Connects to URLs/IPs

Arrival Details

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

It may be downloaded from the following remote sites:

  • http://{BLOCKED}bf.gv.vg

NOTES:

It connects to the following sites in order to execute a malicious code:

  • http://{BLOCKED}ng.info/games/java_trust.php?f={parameter} - detected as HTML_DLOAD.HBM
  • http://{BLOCKED}ng.info/games/java_skyline.php?f={parameter} - detected as JAVA_EXPLOIT.HBM

As a result, malicious routines of the executed malware are exhibited on the infected system.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.124.04
FIRST VSAPI PATTERN DATE: 28 Apr 2011

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

Remove malware files dropped/downloaded by JS_OBFUS.HB

Step 3

Close all opened browser windows

Step 4

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