Virus.X97M.MODFEK.B

November 23, 2023
 Analysis by: Warren Adam Sto. Tomas
 Modified by: Neljorn Nathaniel Aguas
 PLATFORM:

Windows

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

  • Threat Type: Virus

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Virus arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

  TECHNICAL DETAILS

File Size:

133639064 bytes

File Type:

PPTX

Memory Resident:

No

Initial Samples Received Date:

01 Nov 2023

Payload:

Drops files

Arrival Details

This Virus 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 Virus drops a copy of itself in the following folders using different file names:

  • {Excel Application Path}\XLSTART\mypersonnel.xls → if the malware file is not in this location

Propagation

This Virus does not have any propagation routine.

Backdoor Routine

This Virus does not have any backdoor routine.

Rootkit Capabilities

This Virus does not have rootkit capabilities.

Other Details

This Virus does the following:

  • It remains active every time Excel is launched, infecting any new workbooks created and previously saved workbooks when they are opened.
  • It checks for a file named "mypersonnel.xls" in the following folder:
    • {Excel Application path}\XLSTART → Excel startup path
  • If "mypersonnel.xls" exists in Excel startup path:
    • It copies a sheet named "Kangatang" from "mypersonnal.xls" containing the macro to the beginning of the active workbook for persistence.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.170.08

FIRST VSAPI PATTERN DATE:

02 Jan 2023

VSAPI OPR PATTERN File:

18.171.00

VSAPI OPR PATTERN Date:

03 Jan 2023

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.
  • {Excel Application Path}\XLSTART\mypersonnel.xls

Step 4

Scan your computer with your Trend Micro product to delete files detected as Virus.X97M.MODFEK.B. 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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