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JS_BLACOLE

November 13, 2012
 Analysis by: Rhena Inocencio
 ALIASES:

Exploit:JS/Blacole.A (Microsoft), Trojan-Clicker.JS.Iframe.cz (Kaspersky), JS/Obfuscated.c (McAfee), Troj/Dloadr-DOP (Sophos)

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This description is based on compiled analysis of several variants of JS_BLACOLE

This is the Trend Micro detection for malicious scripts that redirects users to possibly malicious URL(s).

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

  TECHNICAL DETAILS

File Size:

Varies

File Type:

JS

Arrival Details

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

It 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 connects to the following possibly malicious URL:

  • http://{pseudorandom string}.ru/runforestrun?sid=cx
  • http://{BLOCKED}fj.{BLOCKED}b.com/d/404.php
  • http://{BLOCKED}anoque.ru:8080/navigator/jueoaritjuir.php
  • http://{BLOCKED}.{BLOCKED}.194.137:8080/content/Qai.jar
  • http://{BLOCKED}.{BLOCKED}.194.137:8080/q.php?f=7245d&e=0
  • http://{BLOCKED}siaboard.ru:8080/forum/showthread.php?page=5fa58bce769e5c2c
  • http://{BLOCKED}otcryz.ru:8080/forum/showthread.php?page=5fa58bce769e5c2c
  • http://{BLOCKED}estaurant.ru:8080/forum/showthread.php?page=5fa58bce769e5c2c
  • http://{BLOCKED}scribed.com/data/hcp_vbs.php?f=cae93&d=0
  • http://{BLOCKED}.{BLOCKED}.196.246/jdb/inf.php?id=25bb45ac9fa3055240ee039271730169
  • http://{BLOCKED}scribed.com/w.php?f=cae93&e=1
  • http://{BLOCKED}scribed.com/main.php?page=8cb1f95c85bce71b
  • http://{BLOCKED}i.ru/forum/showthread.php?page=5fa58bce769e5c2c
  • http://{BLOCKED}.{BLOCKED}cdns.org.uk
  • http://{BLOCKED}o.com/wp-content/uploads/wpbdm/thumbnails/mijob.php
  • http://{BLOCKED}olly.ru/job13journal.php
  • http://{BLOCKED}ms.com/l/content/Qai.jar
  • http://{BLOCKED}ms.com/l/r.php?f={parameter}&e={parameter}

NOTES:

This description is based on compiled analysis of several variants of JS_BLACOLE.

This is the Trend Micro detection for malicious scripts that redirects users to possibly malicious URL(s).

  SOLUTION

Minimum Scan Engine:

9.300

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. 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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