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JS_BLACOLE.TISZ

October 09, 2012
 Analysis by: Jasen Sumalapao
 ALIASES:

Exploit:JS/Blacole.GB (Microsoft), Trojan-Downloader.JS.Expack.acq, Trojan-Downloader.JS.Expack.acq, Trojan-Downloader.JS.Expack.acq, Trojan-Downloader.JS.Expack.acq, Trojan-Downloader.JS.Expack.acq, Trojan-Downloader.JS.Expack.acp, Trojan-Downloader.JS.Expack.acp (Kaspersky), JS/Exploit-Blacole.gr !! (NAI), Troj/ExpJs-CI (Sophos), JS:Trojan.Crypt.HF (FSecure), EXP/JS.Blacole.BI (Antivir), JS:Trojan.Crypt.HF (Bitdefender), JS.Trojan.Redir-7 (Clamav), Exploit.JS.Blacole (Ikarus), JS/Kryptik.WJ trojan (NOD32)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be hosted on a website and run when a user accesses the said website.

It attempts to access certain websites. However, the websites are inaccessible as of this writing. It redirects browsers to certain sites.

  TECHNICAL DETAILS

File Size:

318 bytes

File Type:

JS, HTML, HTM

Memory Resident:

No

Initial Samples Received Date:

04 Sep 2012

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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

Other Details

This Trojan attempts to access certain websites. However, the websites are inaccessible as of this writing.

It attempts to access the following websites to download files, which are possibly malicious:

  • http://{BLOCKED}p.{BLOCKED}r.com/NDD.exe

It redirects browsers to the following sites:

  • http://{BLOCKED}esme.com.tr/fBrNQ5Ax/js.js
  • http://{BLOCKED}ks.com/LJA20adw/js.js
  • http://www.{BLOCKED}arts.be/HSXPYj9q/js.js

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.372.04

FIRST VSAPI PATTERN DATE:

05 Sep 2012

VSAPI OPR PATTERN File:

9.373.00

VSAPI OPR PATTERN Date:

06 Sep 2012

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

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_BLACOLE.TISZ. 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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