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Virus Profile: Exploit-Blacole

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 11/17/2011
Date Added: 11/17/2011
Origin: N/A
Length: varies
Type: Trojan
Subtype: Exploit
DAT Required: 6533
Removal Instructions
   
 
 
   

Description

"Exploit-Blacole" is malicious Java code that exploits a vulnerability in the Java Runtime Environment component of Oracle Java SE and Java for Business that allows the execution of arbitrary code. The vulnerability is further described in CVE-2011-3544.

Aliases –

    • Kaspersky - Exploit.Java.CVE-2011-3544.at
    • Microsoft - Exploit:Java/Blacole.CM
    • Sophos - Mal/JavaGen-A
    • Symantec - Trojan.Maljava

Indication of Infection

    • Redirection of websites.
    • Presence unexpected network connection to the above mentioned sites.

Methods of Infection

This Trojan can be installed while browsing compromised websites.

   

Virus Characteristics

"Exploit-Blacole" is malicious Java code that exploits a vulnerability in the Java Runtime Environment component of Oracle Java SE and Java for Business that allows the execution of arbitrary code. The vulnerability is further described in CVE-2011-3544.

Installation:

This exploit may be encountered when visiting a compromised web page that contains the malicious code. The code is created by an attacker using the "Blackhole" Exploit Kit and inserted into a compromised web page. When the page is visited by a user running vulnerable versions of Java, the malicious Java class runs and allows the execution of arbitrary code.

In the wild, this exploit was observed to be distributed within a Java archive file named "g43kb6j34kblq6jh34kb6j3kl4.jar" and within a collection of other Java class malware, as in the following example list of files:

    • ExtResolution.class [Detected as Exploit-Blacole]
    • Image.class [Detected as Exploit-Blacole]
    • Mover.class [Detected as Exploit-Blacole]
    • TContainer.class [Detected as Exploit-Blacole]
    • Zoom.class [Detected as Generic Exploit!c2w]

Payloads:

    • Downloads arbitrary files
    • Exploit-Blacole exploits a vulnerability described in CVE-2011-3544. Exploit-Blacole attempts to download and execute additional malware to the infected system. The downloaded file can either be an executable file or a dynamic library (.DLL) file with a random file name.
   

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

1. Please go to the Microsoft Recovery Console and restore a clean MBR.

On windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.


On Windows Vista and 7:

Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.