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JAVA_BLACOLE.BM

October 09, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Exploit:Java/Blacole.ES (Microsoft), Trojan.Maljava (Symantec), Generic Exploit!p2g (McAfee), Exploit.Java.CVE-2011-3544.lv (Kaspersky)

 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 Trojan may be downloaded from remote sites by other malware.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

Java Class

Initial Samples Received Date:

18 Mar 2012

Arrival Details

This Trojan may be downloaded from the following remote site(s):

  • http://{BLOCKED}8.{BLOCKED}6.194.137:8080/content/Qai.jar

It may be downloaded from remote site(s) by the following malware:

  • JS_BLACOLE.BO

Installation

This Trojan drops the following component file(s):

  • %User Temp%\Main.class - also detected by Trend Micro as JAVA_BLACOLE.BM

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

NOTES:

It then executes the dropped component file.

The dropped component file downloads a file from a URL specified in the encrypted parameter,. p. The downloaded file is saved as %User Temp%\{random number}.exe, and is executed. As a result, malicious routines of the downloaded file are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.848.04

FIRST VSAPI PATTERN DATE:

19 Mar 2012

VSAPI OPR PATTERN File:

8.849.00

VSAPI OPR PATTERN Date:

19 Mar 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

Remove the malware/grayware file that dropped/downloaded JAVA_BLACOLE.BM

Step 3

Close all opened browser windows

Step 4

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %User Temp%\{random number}.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as JAVA_BLACOLE.BM. 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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