Analysis by: Bren Matthew Ebriega
ALIASES:

TrojanDownloader:O97M/EncDoc!MSR (MICROSOFT); HEUR:Trojan.MSOffice.SAgent.gen (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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: 67,072 bytes
File Type: XLS
Memory Resident: No
Initial Samples Received Date: 28 Feb 2022
Payload: Connects to URLs/IPs, Displays message/message boxes, Downloads files

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.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.188.141/

Other Details

This Trojan does the following:

  • It makes use of Windows Installer objects to perform its download routines.
  • It connects to the URL using msiexec.exe and also uses the same executable to silently install the MSI package it finds on the specified url.
  • It contains the following message details luring users to enable macro content:

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 17.412.03
FIRST VSAPI PATTERN DATE: 28 Feb 2022
VSAPI OPR PATTERN File: 17.413.00
VSAPI OPR PATTERN Date: 01 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

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

Scan your computer with your Trend Micro product to delete files detected as Trojan.X97M.DLOADR.TIOIBERX. 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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