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TSPY_INFOSTL.XXT

November 19, 2014
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

TrojanSpy:Win32/Elvatka.A (Microsoft)

 PLATFORM:

Windows

 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 may be dropped by other malware.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size:

172,032 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Nov 2014

Payload:

Connects to URLs/IPs

Arrival Details

This spyware may be dropped by the following malware:

  • TROJ_MDROP.XXTWZ

Installation

This spyware drops the following component file(s):

  • %User Temp%\{8 random alphanumeric characters}.dll - also detected as TSPY_INFOSTL.XXT

(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.)

Autostart Technique

This spyware drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\AdobeSrv.lnk

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Information Theft

This spyware retrieves the following information from the affected system:

  • Current user name
  • Processor information
  • Operating system version
  • Host name
  • IP address
  • Current system time

Stolen Information

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

  • {BLOCKED}u.{BLOCKED}star.pw:443

  SOLUTION

Minimum Scan Engine:

9.700

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 dropped/downloaded by TSPY_INFOSTL.XXT. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • TROJ_MDROP.XXTWZ

Step 3

Identify and terminate files detected as TSPY_INFOSTL.XXT

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. 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.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Search and delete these files

[ 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 Startup%\AdobeSrv.lnk

Step 5

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