Analysis by: Adrian Cofreros
ALIASES:

TrojanDownloader:Java/OpenConnection.AK(Microsoft),Java.Trojan.Exploit.Bytverify.(F-Secure),TR/Skurtle.3049(AntiVir)

 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:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It is a component of other malware.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: 3,057 bytes
File Type: Java Class
Initial Samples Received Date: 07 Jul 2010

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan is a component of other malware.

Other Details

This Trojan requires its main component to successfully perform its intended routine.

NOTES:

This is the Trend Micro detection for malicious Java Class files used as a component by other malware. It has functions used by the main malware component in performing its malicious routines.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 7.290.02
FIRST VSAPI PATTERN DATE: 07 Jul 2010
VSAPI OPR PATTERN File: 7.291.00
VSAPI OPR PATTERN Date: 07 Jul 2010

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

Scan your computer with your Trend Micro product to delete files detected as JAVA_BYTEVER.NY. 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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