Analysis by: Alvin Bacani
 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: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

It is a component of other malware.

  TECHNICAL DETAILS

File Size: Varies
File Type: LNK
Memory Resident: No
Initial Samples Received Date: 31 May 2013
Payload: Executes files

Arrival Details

This Trojan may be dropped by the following malware:

  • VBS_JENXCUS.A

Installation

This Trojan is a component of other malware.

NOTES:

This is the Trend Micro detection for specially crafted .LNK files that are used to execute dropped copies of the malware, VBS_JENXCUS.A once a shortcut is accessed.

The target property of the .LNK file contains the following format:

  • %System%\cmd.exe /C start {malware path and file name}&start {User's original file} & exit

It executes both the malware VBS_JENXCUS.A and the original non-malicious file to trick users into thinking that the file executed is a legitimate file. As a result, the routines of the main file are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.952.02
FIRST VSAPI PATTERN DATE: 31 May 2013
VSAPI OPR PATTERN File: 9.953.00
VSAPI OPR PATTERN Date: 31 May 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 LNK_JENXCUS.SM. 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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