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Threat Encyclopedia

TSPY_EUPUDS.A

ANALYSIS BY

Mark Joseph Manahan


ALIASES:

Trojan-Dropper.Win32.Injector.jsuq, Trojan.Autoit.F (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:
INFORMATION EXPOSURE:

  • Threat Type:Spyware

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

Infection Channel:

Downloaded from the Internet


This malware uses an AutoIT packer, a scripting language leveraged by cybercriminals. When executed, it steals system-related information and gathers stored user names and passwords from certain browsers.

To get a one-glance comprehensive view of the behavior of this Spyware, refer to the Threat Diagram shown below.

This spyware may be downloaded by other malware/grayware from remote sites.

It retrieves specific information from the affected system.

TECHNICAL DETAILS

File Size:

1,080,066 bytes

File Type:

EXE

File Compression:

AutoIt

Memory Resident:

Yes

Initial Samples Received Date:

20 Dec 2013

Payload:

Downloads files, Steals information

Arrival Details

This spyware may be downloaded by the following malware/grayware from remote sites:

  • TROJ_BANLOAD.LNA

It may be downloaded from the following remote sites:

  • http://www.{BLOCKED}d.com/download/p6SLJ1nC/id3.zip

Installation

This spyware drops the following files:

  • %Application Data%\25f5093e
  • %Application Data%\7c71538a

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

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

  • %Application Data%\{random folder}\{random filename}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It creates the following folders:

  • %Application Data%\{random folder}

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • DynGateInstanceMutexS

Autostart Technique

This spyware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random filename} = "%Application Data%\{random folder}\{random filename}.exe"

Download Routine

This spyware connects to the following URL(s) to download its configuration file:

  • {BLOCKED}.{BLOCKED}.25.190/mfb.php - inaccessible

Information Theft

This spyware retrieves the following information from the affected system:

  • UserID
  • Browser & Version
  • OS Type and Version
  • Malware Version

It attempts to get stored information such as user names, passwords, and hostnames from the following browsers:

  • iexplore.exe
  • chrome.exe
  • firefox.exe

Stolen Information

This spyware sends the gathered information via HTTP POST to the following URL:

  • {BLOCKED}.102.{BLOCKED}.190/index.php

NOTES:

It injects its code to a running process except the following:

  • Services.exe
  • Explorer.exe
  • Userinit.exe
  • Iexplore.exe
  • Firefox.exe
  • Chrome.exe
  • Crsss.exe
  • Svchost.exe
  • Winlogon.exe
  • Lsass.exe

It hooks ExitProcess API with an infinite sleep command to avoid unloading of memory of process to dump.

It sleeps for 21,000 seconds when there's a running AvastSvc.exe application.

It needs another plugin/component gforce_dll for its URL spoofing for the following websites:

  • hotmail.com
  • facebook.com
  • live.com

SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.486.01

FIRST VSAPI PATTERN DATE:

20 Dec 2013

VSAPI OPR PATTERN File:

10.487.00

VSAPI OPR PATTERN Date:

22 Dec 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

Remove malware/grayware files that dropped/downloaded TSPY_EUPUDS.A

    TROJ_BANLOAD.LNA

Step 3

Scan your computer with your Trend Micro product and note files detected as TSPY_EUPUDS.A

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.


 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {random filename} = "%Application Data%\{random folder}\{random filename}.exe"

Step 6

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\{random folder}

Step 7

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.
  • %Application Data%\25f5093e
  • %Application Data%\7c71538a

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_EUPUDS.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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