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Backdoor.MSIL.WEBSHELL.J

March 01, 2023
 ALIASES:

Backdoor:MSIL/Chopper.F!dha (MICROSOFT), Backdoor.MSIL.Chopper (IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

It takes advantage of certain vulnerabilities.

  TECHNICAL DETAILS

File Size:

11,776 bytes

File Type:

DLL

Memory Resident:

No

Initial Samples Received Date:

21 Feb 2023

Payload:

Executes commands, Exploits vulnerabilities

Arrival Details

This Backdoor 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 Backdoor executes the following commands from a remote malicious user:

  • Execute arbitrary commands
  • Execute JavaScript codes

Other Details

This Backdoor does the following:

  • It receives code passed through request parameter name "outlook".

It takes advantage of the following vulnerabilities:

It requires being hosted on a web server in order to proceed with its intended routine.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.272.03

FIRST VSAPI PATTERN DATE:

22 Feb 2023

VSAPI OPR PATTERN File:

18.273.00

VSAPI OPR PATTERN Date:

23 Feb 2023

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:

     
    • BKDR.Win32.TRX.XXPE50FFF065

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 Backdoor.MSIL.WEBSHELL.J. 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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