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TSPY_STYEAL.A

August 07, 2015
 Analysis by: Jon Dexter Laurin
 ALIASES:

HackTool:Win32/Dialupas (Microsoft); PSWTool.Win32.NetPass.agb (Kaspersky); Gen:Variant.Zusy.Elzob.21348 (BitDefender); a variant of MSIL/PSW.Agent.NKY trojan (ESET-NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This spyware 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:

338,944 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

14 May 2014

Arrival Details

This spyware 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 spyware drops the following files:

  • %User Temp%\ChromePass.exe - detected as HKTL_PASSVIEW
  • %User Temp%\dialup.exe - detected as HKTL_DIALUPASS
  • %User Temp%\passwordfox.exe - detected as HKTL_FOXPASS
  • %User Temp%\iepv.exe - detected as HKTL_PASSVIEW
  • %User Temp%\mspass.exe - detected as HKTL_MESSENPASS

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Information Theft

This spyware gathers the following data:

  • Internet Explorer Stored Passwords
  • Mozilla Firefox Stored Passwords
  • Google Chrome Stored Passwords
  • Messenger Passwords
  • Dial Up/VPN Usernames and Passwords

Stolen Information

The stolen information is saved in the following file:

  • %User Temp%\data.txt
  • %User Temp%\firefox.txt
  • %User Temp%\mess.txt
  • %User Temp%\iepv.txt
  • %User Temp%\ChromePass.txt

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

NOTES:

This spyware requires a value for a variable where it gets the email address and password that will be used to send the gathered information.

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.834.03

FIRST VSAPI PATTERN DATE:

05 Aug 2015

VSAPI OPR PATTERN File:

11.835.00

VSAPI OPR PATTERN Date:

06 Aug 2015

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove malware/grayware files dropped/downloaded by TSPY_STYEAL.A. (Note: Please skip this step if the threats listed below have already been removed.)

    • HKTL_PASSVIEW
    • HKTL_MESSENPASS
    • HKTL_FOXPASS
    • HKTL_DIALUPASS

Step 4

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\data.txt
  • %User Temp%\firefox.txt
  • %User Temp%\mess.txt
  • %User Temp%\iepv.txt
  • %User Temp%\ChromePass.txt

Step 5

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


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