Modified by: Paul Steven Nadera
ALIASES:

TrojanDownloader:O97M/Donoff!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: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, 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: 554,876 bytes
File Type: XLS
Memory Resident: No
Initial Samples Received Date: 18 Sep 2020
Payload: Connects to URLs/IPs, Downloads files, Displays windows

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.

Installation

This Trojan adds the following folders:

  • %System Root%\b4q6xwi\2x7O0w8
  • %System Root%\b4q6xwi

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

It adds the following processes:

  • %System Root%\b4q6xwi\2x7O0w8\74O0Y7v.EXE (if download is successful)

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

Download Routine

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

  • http://{BLOCKED}iayocio.com/jqmapuowktbb/555555555555.png

It saves the files it downloads using the following names:

  • %System Root%\b4q6xwi\2x7O0w8\74O0Y7v.EXE

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

Other Details

This Trojan does the following:

  • It displays the following to lure users into enabling macro content:

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 16.232.03
FIRST VSAPI PATTERN DATE: 17 Sep 2020
VSAPI OPR PATTERN File: 16.233.00
VSAPI OPR PATTERN Date: 18 Sep 2020

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 these files

[ 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.  
  • %System Root%\b4q6xwi\2x7O0w8\74O0Y7v.EXE

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\b4q6xwi\2x7O0w8
  • %System Root%\b4q6xwi

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.X97M.DEDEX.AFKC. 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:

Step 6

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]


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