Analysis by: Khristian Joseph Morales
ALIASES:

LNK/DorkLnk.A!tr (FORTINET)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

Tamaño del archivo 2,703 bytes
Tipo de archivo LNK
Residente en memoria No
Fecha de recepción de las muestras iniciales 23 Mar 2022

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" /c "_\_\_\_\_\_\putty.exe||(forfiles /P %Application Data%\..\..\ /S /M Desktop.rar /C "cmd /c (%Program Files%\winrar\winrar.exe x -inul -o+ @path||%Program Files%\winrar\winrar.exe x -inul -o+ @path)&&_\_\_\_\_\_\putty.exe")"

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

  SOLUTION

Motor de exploración mínimo 9.800
Primer archivo de patrones de VSAPI 17.468.02
Primera fecha de publicación de patrones de VSAPI 28 Mar 2022
Versión de patrones OPR de VSAPI 17.467.00
Fecha de publicación de patrones OPR de VSAPI 29 Mar 2022

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.CMDRUN.AD. 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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