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Threat Encyclopedia

TROJ_BLOCKER.J


ALIASES:

Trojan horse Downloader.Agent2.BSIU (AVG), TrojanDownloader.Agent (VBA32)

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: No

  • In the wild: Yes

OVERVIEW

Infection Channel:

Downloaded from the Internet


This malware is related to the fake flash player scam targeting users in Turkey. It starts with a video link sent via Facebook. This malware specifically pretends as the update and installs the bogus Chrome extension, which blocks antivirus websites.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan may arrive on a system by clicking spammed malicious links on the social networking site Facebook.

TECHNICAL DETAILS

File Size:

331,776 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

22 Jan 2014

Payload:

Downloads files

Arrival Details

This Trojan may be downloaded from the following remote sites:

  • http://www.{BLOCKED}r.in

It may arrive on a system by clicking spammed malicious links on the social networking site Facebook.

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

  • %User Profile%\Application Data\Smart Player Installer.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It creates the following folders:

  • %System Root%\IntelNewz
  • %System Root%\IntelNewz\{random number}

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}f.biz/ask.txt - updated URL list
  • http://{BLOCKED}f.biz/ajax/background.js
  • http://{BLOCKED}f.biz/ajax/icon.png
  • http://{BLOCKED}f.biz/ajax/jquery-1.9.1.min.js
  • http://{BLOCKED}f.biz/ajax/manifest.json
  • http://{BLOCKED}f.biz/ajax/script.js

It saves the files it downloads using the following names:

  • %System Root%\IntelNewz\{random number}\background.js - detected as JS_BLOCKER.J
  • %System Root%\IntelNewz\{random number}\icon.png - non-malicious component
  • %System Root%\IntelNewz\{random number}\jquery-1.9.1.min.js - non-malicious component
  • %System Root%\IntelNewz\{random number}\manifest.json - non-malicious component
  • %System Root%\IntelNewz\{random number}\script.js - non-malicious component

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

NOTES:

The Facebook spam message sending this malware download link is being sent by HTML_BLOCKER.K.

It installs the downloaded files as a Chrome web browser extension.

SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.556.04

FIRST VSAPI PATTERN DATE:

22 Jan 2014

VSAPI OPR PATTERN File:

10.557.00

VSAPI OPR PATTERN Date:

23 Jan 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

Remove malware/grayware files dropped/downloaded by TROJ_BLOCKER.J

Step 3

Remove the malware/grayware file that dropped/downloaded TROJ_BLOCKER.J

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\IntelNewz

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_BLOCKER.J. 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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