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JAVA_BLACOLE.GX

October 09, 2012
 Analysis by: Jasen Sumalapao
 ALIASES:

Exploit:Java/CVE-2012-1723.EI (Microsoft), JV/Exploit-Blacole.q !! (NAI), Java/Blacole.G (Authentium), Java/Blacole.G (exact) (Fprot), Exploit.Java.CVE-2012 (Ikarus), a variant of Java/Exploit.CVE-2012-1723.BH 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: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan arrives as a component bundled with malware/grayware packages. It may be hosted on a website and run when a user accesses the said website. However, as of this writing, the said sites are inaccessible.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

23,911 bytes

File Type:

Java Class, Java, JAR

Memory Resident:

No

Initial Samples Received Date:

30 Aug 2012

Payload:

Downloads files

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

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://{BLOCKED}elo.nstrefa.pl/Y46yjQJV/index.html
  • http://{BLOCKED}shfjd.ns01.biz/Leh.jar
  • http://{BLOCKED}eight.org/Leh.jar
  • http://{BLOCKED}ampoil.ru/Leh.jar
  • http://{BLOCKED}ariodupersite.ru/Leh.jar
  • http://{BLOCKED}zeh.ygto.com/Leh.jar

However, as of this writing, the said sites are inaccessible.

Download Routine

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

  • CVE-2012-1723
  • CVE-2012-4681

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

As of this writing, the said sites are inaccessible.

NOTES:

This Trojan downloads the file specified in the parameter "uid" and saves the downloaded file as %User Temp%\{random file name}. It then executes the downloaded file.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.360.02

FIRST VSAPI PATTERN DATE:

30 Aug 2012

VSAPI OPR PATTERN File:

9.361.00

VSAPI OPR PATTERN Date:

31 Aug 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 JAVA_BLACOLE.GX. 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 4

Download and apply this security patch 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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