Analysis by: Anthony Joe Melgarejo
ALIASES:

Exploit:Java/ByteVerify.G (Microsoft), Exploit-ByteVerify (McAfee), Exploit.Java.ByteVerify-1 (ClamAV), Java/ByteVerify.B!exploit (Fortinet), Java/Trojan!f40b (F-Prot), Java/TrojanDownloader.OpenStream.NAC trojan (ESET), Exploit/ByteVerify (Panda), Trojan-Downloader.Java.OpenStream.nac (VBA32)

 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.

  TECHNICAL DETAILS

File Size: 827 bytes
File Type: Java Class
Initial Samples Received Date: 24 Jan 2013

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.

Other Details

This Trojan requires the following additional components to properly run:

  • omfg.class

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.688.05
FIRST VSAPI PATTERN DATE: 29 Jan 2013
VSAPI OPR PATTERN File: 9.689.00
VSAPI OPR PATTERN Date: 30 Jan 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

Scan your computer with your Trend Micro product to delete files detected as JAVA_BYTEVERIFY.D. 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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