Analysis by: Carlos Villegas Madrid
ALIASES:

Trojan:MSIL/LummaStealer.B!MTB (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size: 1,782,272 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 16 Aug 2023
Payload: Connects to URLs/IPs, Steals information, Collects system information

Arrival Details

This Trojan Spy 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 Spy adds the following processes:

  • "%Windows%\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"

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

It injects codes into the following process(es):

  • RegAsm.exe

Download Routine

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

  • http:/{BLOCKED}techs.com/Amdaygo.exe → Detected as Trojan.Win32.AMADEY.YXDHDZ

Information Theft

This Trojan Spy gathers the following data:

  • Computer Name
  • OS Information
  • CPU Information
  • Screen Resolution
  • System Language
  • Physical Memory Installed

Stolen Information

This Trojan Spy sends the gathered information via HTTP POST to the following URL:

  • http://{BLOCKED}c-node.io/c2sock
  • http://{BLOCKED}fe.xyz/c2sock

Other Details

This Trojan Spy connects to the following website to send and receive information:

  • http://{BLOCKED|c-node.io/c2conf
  • http://{BLOCKED}fe.xyz/c2conf

It does the following:

  • It has the following capabilities:
    • Loader function (Execute/Load downloaded executables or DLL files)
    • Execute PowerShell script
    • Manage files (Upload/Download files from server)
    • Manage processes (Create list)
    • Delete itself after execution
  • It exfiltrates the following data from Google Chrome.
    • History
    • Login Data
    • Login Data For Account
    • Web Data
    • Network\Cookies
    • Local Storage\leveldb
    • Local Storage\leveldb
  • It exfiltrates the following data from Mozilla Firefox.
    • %appdata%\Mozilla\Firefox\Profiles
    • key4.db
    • cert9.db
    • formhistory.sqlite
    • cookies.sqlite
    • logins.json
    • places.sqlite
  • It exfiltrates data from the following appilication.
    • AnyDesk
      • .conf
      • %appdata%\AnyDesk
    • FileZilla
      • recentservers.xml
      • sitemanager.xml
    • KeePass
      • .kbdx
    • Steam
      • ssfn*
      • %programfiles%\Steam\config
    • Telegram
      • s*
  • It exfiltrates User Data found on the following Browsers.
    • Chrome
    • Chromium
    • Edge
    • Kometa
    • Opera Stable
    • Opera GX Stable
    • Opera Neon
    • Brave Software
    • Comodo
    • CocCoc
  • It exfiltrates data on the following crypto wallets.
    • Binance
    • Electrum
    • Ethereum
    • Exodus
    • Ledger Live
    • Atomic
    • Coinomi
    • Authy Desktop
    • Bitcoin core
    • JAXX New Version
  • It exfiltrates data found on the following mail client applications.
    • Windows Mail
      • %localappdata%\Microsoft\Windows Mail\Local Folders
      • .eml
    • The Bat!
      • %localappdata%\The Bat!
      • Mail Clients\The Bat\Local
        • .TBB
        • .TBN
        • .MSG
        • .EML
        • .MSB
        • .mbox
        • .ABD
        • .FLX
        • .TBK
        • .HBI
    • Thunderbird
      • %appdata%\Thunderbird\Profiles
    • PMAIL
      • .CNM
      • .PMF
      • .PMN
      • .PML
      • CACHE.PM
      • .WPM
      • .PM
      • .USR
    • Mailbird
      • Mail Clients\Mailbird
      • \MessageIndex
      • .db
    • eM Client
      • .dat
      • .dat-shm
      • .dat-wal
  • It exfiltrates crypto currency browser wallet extensions and 2FA applications.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.671.00
FIRST VSAPI PATTERN DATE: 01 Sep 2023
VSAPI OPR PATTERN File: 18.671.00
VSAPI OPR PATTERN Date: 02 Sep 2023

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.XXPE50FFF072

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

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.MSIL.LUMMAC.C. 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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