Analysis by: John Anthony Banes
 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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

It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.

  TECHNICAL DETAILS

File Size: 405,986 bytes
File Type: AU3
Memory Resident: No
Initial Samples Received Date: 26 Jan 2018
Payload: Drops files

Arrival Details

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

Dropping Routine

This Trojan Spy drops the following files:

  • {malware path}\{5 random characters}

Other Details

This Trojan Spy requires the existence of the following files to properly run:

  • {malware path}\gft.jpg - config file

It does the following:

  • The malware will shut the computer down and terminate all processes if the malware is not located at %Application Data%\{path name from config file}
  • If the process "avastui.exe" is present, the malware will sleep for 20 seconds.

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.

NOTES:

This Trojan spy is an AutoIt script file (AU3), and the AutoIt application must be installed to run this malware.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.928.03
FIRST VSAPI PATTERN DATE: 26 Jan 2018
VSAPI OPR PATTERN File: 13.929.00
VSAPI OPR PATTERN Date: 27 Jan 2018

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

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.  
  • {malware path}\{5 random characters}
  • {malware path}\gft.jpg

Step 4

Scan your computer with your Trend Micro product to delete files detected as TSPY_LIMITA.CMP. 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 the following Trend Micro Support pages for more information:


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