Analysis by: Mark Joseph Manahan
ALIASES:

Troj/Eupuds-A (Sophos) ,Trojan horse PSW.Banker_c.APQ (AVG) ,W32/Inject.FHKF!tr (Fortinet) ,Trojan.Win32.Inject.fhkf (Kaspersky) ,Trojan:Win32/Eupuds.B (Microsoft) ,RDN/Generic PWS.y!yx (McAfee) ,Trojan.Zbot (Symantec) ,Trojan.Win32.Generic!BT (Sunbelt)

 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 spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size: 586,752 bytes
File Type: EXE
File Compression: AutoIt
Memory Resident: Yes
Initial Samples Received Date: 28 Apr 2014
Payload: Downloads files, Steals information

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 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.)

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"

Information Theft

This spyware retrieves the following information from the affected system:

  • User ID
  • 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:

  • http://{BLOCKED}.{BLOCKED}.136.40/index1.php?log={data}

NOTES:

This spyware injects its code to a running process except the following:

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

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

  • facebook.com
  • hotmail.com
  • live.com
  • pagador.com.br

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.758.09
FIRST VSAPI PATTERN DATE: 28 Apr 2014

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 and note files detected as TSPY_EUPUDS.AY

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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 5

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 6

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


Did this description help? Tell us how we did.