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Backdoor.Win64.CROM.A

February 24, 2022
 Analysis by: Khristian Joseph Morales
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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 connects to a website to send and receive information.

It gathers certain information on the affected computer.

  TECHNICAL DETAILS

File Size:

5,996,800 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

21 Feb 2022

Payload:

Connects to URLs/IPs, Steals information, Executes commands, Sets up a proxy server

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.

Installation

This Backdoor adds the following processes:

  • %System%\cmd.exe /c "wmic csproduct get uuid"
  • %System%\cmd.exe /c "getmac"
  • %System%\cmd.exe /c "ipconfig"
  • %System%\cmd.exe /c "wmic os get Caption"
  • %System%\cmd.exe /c "hostname"

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Backdoor Routine

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

  • Upload file
  • Download file
  • Zip Folder
  • Execute file
  • Set timestamp
  • Execute arbitrary commands

It connects to the following websites to send and receive information:

  • http://{BLOCKED}ort365.com/agentsAPI/initial/
  • http://{BLOCKED}ort365.com/agentsAPI/message/

Information Theft

This Backdoor gathers the following information on the affected computer:

  • UUID
  • MAC Address
  • IP
  • Hostname
  • Timestamp
  • Operating system information

Other Details

This Backdoor does the following:

  • It sets up a proxy server

It accepts the following parameters:

  • {localHost}
    • Establish a server connection

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.404.04

FIRST VSAPI PATTERN DATE:

24 Feb 2022

VSAPI OPR PATTERN File:

17.405.00

VSAPI OPR PATTERN Date:

25 Feb 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:

     
    • TROJ.Win32.TRX.XXPE50FFF053

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.Win64.CROM.A. 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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