Backdoor.Win64.LOTUSBLOSSOM.ILE

May 14, 2024
 Analysis by: Raymart Christian Yambot
 ALIASES:

VHO:Trojan.Win32.LotusBlossom.ds (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

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

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

  TECHNICAL DETAILS

File Size:

263,168 bytes

File Type:

DLL

Memory Resident:

No

Initial Samples Received Date:

06 May 2024

Payload:

Connects to URLs/IPs, Steals information, Drops files

Arrival Details

This Backdoor 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 Backdoor drops the following files:

  • %System%\config\systemprofile\AppData\Roaming\Microsoft\Protect\Windows\DMI{Random 6 characters}.DAT

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

It creates the following folders:

  • %System%\config\systemprofile\AppData\Roaming\Microsoft\Protect\Windows

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

Backdoor Routine

This Backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

  • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.19
  • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.198
  • https://www.{BLOCKED}sky.com
  • https://www.{BLOCKED}z.com

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

Information Theft

This Backdoor gathers the following data:

  • System Information:
    • Hostname
    • IPv4 address
    • Default Gateway
    • Date and Time

Other Details

This Backdoor does the following:

  • It requires being registered as a service to properly execute.
  • It checks for the presence of the file:
    • %Temp%\TS_FB56.tmp

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

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.340.03

FIRST VSAPI PATTERN DATE:

14 May 2024

VSAPI OPR PATTERN File:

19.341.00

VSAPI OPR PATTERN Date:

15 May 2024

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:

     
    • TROJ.Win32.TRX.XXPE50FFF080

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.
  • %System%\config\systemprofile\AppData\Roaming\Microsoft\Protect\Windows\DMI{Random 6 characters}.DAT

Step 5

Search and delete these folders

[ 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%\config\systemprofile\AppData\Roaming\Microsoft\Protect\Windows

Step 6

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win64.LOTUSBLOSSOM.ILE. 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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