Trojan.XF.DRIDEX.AD

January 03, 2022
 Analysis by: Nathaniel Gregory Ragasa
 Modified by: Mc Justine De Guzman
 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

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:

228,864 bytes

File Type:

XLS

Memory Resident:

No

Initial Samples Received Date:

21 Dec 2021

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 drops the following files:

  • %All Users Profile%\MdhMHnmXJYPcUbecYV.vbs

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

It adds the following processes:

  • "%Windows%\explorer.exe" %All Users Profile%\MdhMHnmXJYPcUbecYV.vbs
  • wmic process call create "rundll32.exe %All Users Profile%\monigger.bin DllRegisterServer"
  • wmic process call create "regsvr32.exe /s %All Users Profile%\monigger.bin"
  • wmic process call create "regsvr32.exe -s %All Users Profile%\monigger.bin"

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

Download Routine

This Trojan accesses the following websites to download files:

  • https://{BLOCKED}r.site/H3X3/VwfsOXBAUJokvaginapussy.bin
  • http://{BLOCKED}onlineltd.com/W9H/yjhlXvkOLnSkaHZvaginapussy.bin
  • https://{BLOCKED}r.site/SYQ/kMLcijvaginapussy.bin

It saves the files it downloads using the following names:

  • %All Users Profile%\monigger.bin

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

Other Details

This Trojan does the following:

  • It spawns the following false message upon exit
  • It will only start its malicious routine upon exit

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.266.04

FIRST VSAPI PATTERN DATE:

21 Dec 2021

VSAPI OPR PATTERN File:

17.267.00

VSAPI OPR PATTERN Date:

22 Dec 2021

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.  
  • %All Users Profile%\monigger.bin
  • %All Users Profile%\MdhMHnmXJYPcUbecYV.vbs

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.XF.DRIDEX.AD. 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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