Analysis by: Leidryn Saludez
ALIASES:

TrojanDownloader:O97M/Ursnif.PDJ!MTB (MICROSOFT)

 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, Dropped by other malware

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.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 53,248 bytes
File Type: XLS
Memory Resident: No
Initial Samples Received Date: 03 Jul 2023
Payload: Connects to URLs/IPs, Drops files, 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.

Installation

This Trojan drops the following files:

  • {Parent folder of the default excel save location}\calc.exe → copy of %System%\rundll32.exe

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

It adds the following processes:

  • {Parent folder of the default excel save location}\calc.exe {Parent folder of the default excel save location}\{Random}.,#1 /q

Download Routine

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

  • https://{BLOCKED}mi.com

It saves the files it downloads using the following names:

  • {Parent folder of the default excel save location}\{Random}.

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

  • It lures the user to click "APRI" (translates as "OPEN") enabling macro content:

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 17.916.02
FIRST VSAPI PATTERN DATE: 03 Nov 2022
VSAPI OPR PATTERN File: 17.917.00
VSAPI OPR PATTERN Date: 04 Nov 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:

     Downloader.VBA.TRX.XXVBAF01FF042

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

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 4

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.
  • {Parent folder of the default excel save location}\{Random}.
  • {Parent folder of the default excel save location}\calc.exe

Step 5

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


Did this description help? Tell us how we did.