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Trojan.Win32.SHELLCODE.AM

April 21, 2022
 Analysis by: Mc Justine De Guzman
 Modified by: Janus Agcaoili
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 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.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

  TECHNICAL DETAILS

File Size:

411,648 bytes

File Type:

DLL

Initial Samples Received Date:

14 Apr 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.

Backdoor Routine

This Trojan executes the following command(s) from a remote malicious user:

  • May execute files with the following extension when received:
    • .exe
    • .vbs
    • .ps1
      • format: "powershell -WindowsStyle Hidden -ep bypass -file "
    • .bat
    • .cmd
  • The next routine is arbitrary and depends on the executed file behavior. However, as of this writing, no additional file was received from the C&C.

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.106.18:4177
  • {BLOCKED.{BLOCKED}.48.72:4177

It attempts to communicate with its C&C server using the following ports: $DATA$

  • 4177

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.510.04

FIRST VSAPI PATTERN DATE:

17 Apr 2022

VSAPI OPR PATTERN File:

17.511.00

VSAPI OPR PATTERN Date:

18 Apr 2022

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:

     
    • Ransom.Win32.TRX.XXPE50FFF055

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

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.SHELLCODE.AM. 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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