Analysis by: Jasen Sumalapao
 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

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Trojan may arrive bundled with malware packages as a malware component. It may be downloaded by other malware/grayware from remote sites. It may be dropped by other malware. It may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size: 8,487 bytes
File Type: JAR, Java, Java Class
Initial Samples Received Date: 12 Jul 2012
Payload: Downloads files

Arrival Details

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

It may be downloaded by the following malware/grayware from remote sites:

  • HTML_DROPPER.EV

It may be dropped by other malware.

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

It may be downloaded from the following remote sites:

  • http://www.{BLOCKED}te.info/ad/test.jar

Download Routine

This Trojan takes advantage of the following software vulnerabilities to download possibly malicious files:

NOTES:

This Trojan is a Java component of the Blackhole Exploit Kit. This .JAR file is used to convert the embedded text in HTML_DROPPER.EV to binary. It then executes the converted binary detected as TROJ_DLOADER.UQY. As a result, malicious routines of the drop files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.252.04
FIRST VSAPI PATTERN DATE: 12 Jul 2012
VSAPI OPR PATTERN File: 9.253.00
VSAPI OPR PATTERN Date: 12 Jul 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.EV

    • HTML_DROPPER.EV

Step 3

Remove malware files dropped/downloaded by JAVA_BLACOLE.EV

Step 4

Close all opened browser windows

Step 5

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

Step 6

Download and apply these security patches Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.


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