Analysis by: Rika Joi Gregorio
 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: Dropped by other malware

This Trojan may be dropped by other malware.

It is a component of other malware.

  TECHNICAL DETAILS

File Size: 932 bytes
File Type: LNK
Memory Resident: No
Initial Samples Received Date: 22 Oct 2013
Payload: Executes files

Arrival Details

This Trojan may be dropped by the following malware:

  • BKDR_CAPHAW.EF

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, BKDR_CAPHAW.EF once this shortcut is accessed. When clicked, it executes the dropped copy of BKDR_CAPHAW.EF and opens the target folder, hiding its malicious routines from the user.

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

%System%\cmd.exe /C start /b "cmd.exe" /C if exist "{target folder}\{malware filename}" start /b "{ target folder}\{malware filename}" start /b "{target folder}"

As a result, the routine of the main file is exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.300

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 LNK_CAPHAW.SM

     
    • BKDR_CAPHAW.EF

Step 3

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