Analysis by: Anthony Joe Melgarejo
ALIASES:

Exploit-FKJ!CVE2012-1723 (McAfee), LooksLike.Java.CVE-2012-1723.a (v) (Vipre), a variant of Java/Exploit.Agent.OXH trojan (ESET)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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

It takes advantage of software vulnerabilities to allow a remote user or malware/grayware to download files. It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: Varies
File Type: Java Class
Memory Resident: No
Initial Samples Received Date: 24 Sep 2013
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_JNLPER.HAP

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

Download Routine

This Trojan takes advantage of the following software vulnerabilities to allow a remote user or malware/grayware to download files:

  • CVE-2012-1723

It saves the files it downloads using the following names:

  • %User Temp%\{download time stamp (in MMddHHmmss format)} - detected as TROJ_KARAGANY.RJ

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

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

It downloads a possibly malicious file from a certain URL. The URL where this malware downloads the said file depends on the following parameter(s) passed on to it by its components:

  • size

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 10.298.02
FIRST VSAPI PATTERN DATE: 24 Sep 2013
VSAPI OPR PATTERN File: 10.299.00
VSAPI OPR PATTERN Date: 25 Sep 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove the malware/grayware file that dropped/downloaded JAVA_EKSPLOYT.HP

  • HTML_JNLPER.HAP

Step 3

Remove malware/grayware files dropped/downloaded by JAVA_EKSPLOYT.HP

  • TROJ_KARAGANY.RJ

Step 4

Scan your computer with your Trend Micro product to delete files detected as JAVA_EKSPLOYT.HP. 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 5

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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