Analysis by: Neljorn Nathaniel Aguas
 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.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 225,824 bytes
File Type: Other
Memory Resident: No
Initial Samples Received Date: 15 Apr 2025
Payload: Connects to URLs/IPs

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

  • https://{BLOCKED}movit.com.pe/wp-includes/style-engine/class-wp-style-engine-update.ph
  • https://{BLOCKED}a.mx/v1/wp-content/themes/crocal/taxonomy.php

However, as of this writing, the said sites are inaccessible.

Other Details

This Backdoor does the following:

  • It requires to be decrypted and loaded by a specific file in order to proceed with its intended routine.
  • It requires to be in the following directory with a specific filename:
    • %Program Files%\Common Files\Microsoft Shared\ink\mraut.inc
  • It requires the following file in order to proceed with its communication to C2 server:
    • %Program Files%\Common Files\System\msadc\msdfmap.dat → detected as Backdoor.Win64.MRSADOOR.A
      • contains an encrypted C2 server addresses

(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: 20.216.04
FIRST VSAPI PATTERN DATE: 21 May 2025
VSAPI OPR PATTERN File: 20.217.00
VSAPI OPR PATTERN Date: 22 May 2025

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Program Files%\Common Files\System\msadc\msdfmap.dat

Step 4

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win64.MRSADOOR.ZJME.enc. 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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