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TROJ_EPYKS.A

October 09, 2012
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan may be downloaded from remote sites by other malware.

  TECHNICAL DETAILS

File Size:

633,344 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Feb 2012

Arrival Details

This Trojan may be downloaded from the following remote site(s):

  • http://www.{BLOCKED}tarlogic.com/forum/Themes/core/images/topic/test.exe

It may be downloaded from remote site(s) by the following malware:

  • TROJ_DOFOIL.GE

Installation

This Trojan drops and executes the following files:

  • %User Profile%\Application Data\Skype\Skype.exe - also detected as TROJ_EPYKS.A

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It drops the following copies of itself into the affected system:

  • %User Temp%\bred.tmp
  • %User Temp%\0ADFF44.tmp

(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.)

NOTES:

It renames the file %Program Files%\Skype\Phone\Skype.exe to %Program Files%\Skype\Phone\Skype.exe.bak and replaces the former with another file. However, due to errors in its code, it fails to perform its intended routine.

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Identify and terminate files detected as TROJ_EPYKS.A

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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

NOTES:

To Restore Renamed File:

  1. Go to the directory %Program Files%\Skype\Phone
  2. Rename the file Skype.exe.bak to Skype.exe


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