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JAVA_YOMENK.A

October 09, 2012
 Analysis by: Jed Valderama
 ALIASES:

Java/TrojanDownloader.Agent.NDT trojan (Eset: NOD32), Java/Agent.QI!tr.dldr (Fortinet)

 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


This is used as a component of other malware. It exploits a vulnerability in several versions of Oracle Java Runtime Environment (JRE) component. It allows this Trojan to execute arbitrary codes on the affected system.

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

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

  TECHNICAL DETAILS

File Size:

4,108 bytes

File Type:

Java Class

Memory Resident:

No

Initial Samples Received Date:

13 Sep 2012

Arrival Details

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

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • {parameter1}/api.php?key=1234&computer=1234&tool=0&page=0&user=&pass={parameter2}

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

Information Theft

This Trojan accepts the following parameters:

  • "koy"
  • "url"
  • "panel"

NOTES:

This malware is used as a component of other malware. It exploits a vulnerability in the Java Runtime Environment component in Oracle Java SE JDK and JRE 7 and 6 Update 27 and earlier allows remote untrusted Java Web Start applications and untrusted Java applets to affect confidentiality, integrity, and availability via unknown vectors related to Scripting.

More details on the vulnerability can be found here:

  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3544

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.390.04

FIRST VSAPI PATTERN DATE:

13 Sep 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_YOMENK.A. 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.

  • http://www.oracle.com/technetwork/topics/security/javacpuoct2011-443431.html


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