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TROJ_FRS.0NA103DT25

May 13, 2025
 ALIASES:

Virus:Win32/Expiro.EK!MTB (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Trojan 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:

21,498,880 bytes

File Type:

EXE

Initial Samples Received Date:

12 May 2025

Payload:

Delete files, Drops files, Modifies files

Arrival Details

This Trojan 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 Trojan drops the following files:

  • %Application Data%\8aa7dee7ad391c41.bin
  • {installation path}\ssleay32.dll

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Trojan does the following:

  • It tries to modify the following files:
    • %System%\alg.exe
    • %Windows%\Microsoft.NET\Framework\v4.0.30319\aspnet_state.exe
  • It tries to delete the following folder:
    • %User Temp%\vmware-{username}\VMwareDnD\{random}\
  • It tries to delete the following files:
    • %User Temp%\vmware-{username}\VMwareDnD\{random}\{malware archive}.zip
    • %System%\logfiles\epsec\epsec.etl
    • %System%\logfiles\epsec\epsec1.etl
    • %System%\logfiles\epsec\netflt.etl
    • %System%\logfiles\epsec\epsys.etl
    • %System%\logfiles\epsec\adsec.etl
    • %System%\logfiles\epsec\pfsec.etl
    • %System%\logfiles\epsec\ids.etl
    • %System%\logfiles\epsec\ids2.etl
    • %System%\logfiles\epsec\actmon.etl
    • %System%\logfiles\epsec\acm.etl
    • %System%\logfiles\epsec\acm2.etl
    • %System%\logfiles\epsec\emal.etl
    • %System%\logfiles\epsec\emal2.etl
    • %System%\logfiles\epsec\emal3.etl
    • %System%\logfiles\epsec\emal4.etl
    • %System%\logfiles\epsec\eps.etl
    • %System%\logfiles\epsec\eps2.etl
    • %System%\logfiles\epsec\eps3.etl
    • %System%\logfiles\epsec\epfw.etl
    • %System%\logfiles\epsec\epfw2.etl
    • %System%\logfiles\epsec\devmon.etl
    • %System%\logfiles\epsec\epfwlog.etl

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

20.172.04

FIRST VSAPI PATTERN DATE:

29 Apr 2025

VSAPI OPR PATTERN File:

20.173.00

VSAPI OPR PATTERN Date:

30 Apr 2025

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

    • TROJ.Win32.TRX.XXPE50FFF093

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

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 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.
  • %Application Data%\8aa7dee7ad391c41.bin
  • {installation path}\ssleay32.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_FRS.0NA103DT25. 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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