Analysis by: Jasen Sumalapao
ALIASES:

Java.Exploit.CVE-2012-4681.D (FSecure), Java.Exploit.CVE-2012-4681.D (Bitdefender), a variant of Java/Exploit.CVE-2012-4681.N 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: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Trojan may be downloaded by other malware/grayware from remote sites. 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.

  TECHNICAL DETAILS

File Size: 14,930 bytes
File Type: Java Class, Java, JAR
Memory Resident: No
Initial Samples Received Date: 04 Sep 2012
Payload: Downloads files

Arrival Details

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

  • http://{BLOCKED}finsmec.org/Leh.jar

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.

Download Routine

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

  • CVE-2012-4681

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

NOTES:

This Trojan downloads the file specified in the parameter uid and arguments from the host website. The downloaded file will be save as %User Temp%\{random file name}. It then executes the downloaded file.

  SOLUTION

Minimum Scan Engine: 9.200

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.TIS. 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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