Analysis by: Jimelle Monteser
ALIASES:

Win32/BrowseFox.B application (NOD32), AdWare.Agent (Ikarus)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component.

  TECHNICAL DETAILS

File Size: 352 bytes
File Type: JS
Memory Resident: Yes
Initial Samples Received Date: 15 Apr 2014

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}wse.com
  • https://wac.{BLOCKED}stcdn.net/800952/471459f1-c8e9-496f-b471-ee3d269b9c15-www/update/firefox
  • http://wac.{BLOCKED}stcdn.net/800952/471459f1-c8e9-496f-b471-ee3d269b9c15-api/gfbs

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.728.04
FIRST VSAPI PATTERN DATE: 15 Apr 2014
VSAPI OPR PATTERN File: 10.729.00
VSAPI OPR PATTERN Date: 16 Apr 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

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