Analysis by: Raighen Sanchez
ALIASES:

TrojanDownloader:VBS/Nemucod.PABL!MTB (MICROSOFT)

 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: 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.

It does not have any propagation routine.

It does not have any backdoor routine.

It does not have any information-stealing capability.

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

  TECHNICAL DETAILS

File Size: 22,619 bytes
File Type: VBS
Memory Resident: No
Initial Samples Received Date: 22 Apr 2025
Payload: Connects to URLs/IPs, Drops 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:

  • %Public%\InvoiceXpress

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

It drops the following files:

  • %Public%\InvoiceXpress.zip

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

It adds the following processes:

  • %Public%\InvoiceXpress\bin\InvoiceXpress.cmd → If found in the system, otherwise will not add this process.

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Rootkit Capabilities

This Trojan does not have rootkit capabilities.

Download Routine

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

  • https://{BLOCKED}9a8s9d0x9d8c9d8a7s8x9s8z7s8d9z8s79g8a7z8d7v8d7s827d8.ngrok.app/InvoiceXpress.zip

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan does the following:

  • It displays the content of the following URL to trick user in just viewing a normal document:
    • https://{BLOCKED}e.google.com/file/d/1kaW-o2QIPfHRAQ4_-7P3BEv8LLDhG7D2/view

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

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 20.186.03
FIRST VSAPI PATTERN DATE: 06 May 2025
VSAPI OPR PATTERN File: 20.187.00
VSAPI OPR PATTERN Date: 07 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 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.
  •  %Public%\InvoiceXpress

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.
  • %Public%\InvoiceXpress.zip

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.VBS.NEMUCOD.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:


Did this description help? Tell us how we did.