Ransom.MSIL.EGOGEN.THEBBBC

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

It adds certain registry entries to disable the Task Manager. This action prevents users from terminating the malware process, which can usually be done via the Task Manager.

It terminates itself if it detects it is being run in a virtual environment.

It encrypts files with specific file extensions. It drops files as ransom note. It avoids encrypting files with the following file extensions.

Arrival Details

This Ransomware 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 Ransomware drops the following files:

• %AppDataLocal%\discord.exe
• %Application Data%\ID
• %Application Data%\fondo_antiguo.jpg → Copy of current background
• %User Profile%\Pictures\image[Random 30 characters].jpg → deleted afterwards
• %User Startup%\BXIuSsB.exe
• %User Temp%\Adobe\BXIuSsB.exe
• %User Temp%\[Random 7 characters]_dat.log
• %Application Data%\delback.bat
• %User Startup%\update.bat

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It drops and executes the following files:

• %User Startup%\1.exe
• %User Startup%\archive.exe
• %User Startup%\Xarch.exe
• %User Startup%\teleratserver.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

It adds the following processes:

• %Application Data%\Read Me First!.txt
• cmd "/c @echo off & echo github: https://{BLOCKED}t.me/{BLOCKED}69 & start https://{BLOCKED}t.me/{BLOCKED}69"
• vssadmin delete shadows /all /quiet
• bcdedit.exe /set {default} recoveryenabled no
• bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures
• ping -n 1 -w 5000 {BLOCKED}.{BLOCKED}.254.254
• del "%User Startup%\BXIuSsB.exe"

It creates the following folders:

• %User Temp%\Adobe → deleted after encryption

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

This Ransomware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
1 = %User Startup%\1.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
archive = %User Startup%\archive.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Xarch = %User Startup%\Xarch.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
discord = %AppDataLocal%\discord.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
teleratserver = %User Startup%\teleratserver.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
BXIuSsB = %User Startup%\BXIuSsB.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
BXIuSsB.exe = %User Temp%\Adobe\BXIuSsB.exe

Other System Modifications

This Ransomware adds the following registry entries to disable the Task Manager:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = 1

It changes the desktop wallpaper by modifying the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = %User Profile%\Pictures\image[Random 30 characters].jpg

It sets the system's desktop wallpaper to the following image:

Process Termination

This Ransomware terminates the following processes if found running in the affected system's memory:

• taskmgr
• sqlagent
• winword
• sqlbrowser
• sqlservr
• sqlwriter
• oracle
• ocssd
• dbsnmp
• synctime
• mydesktopqos
• agntsvc.exeisqlplussvc
• xfssvccon
• mydesktopservice
• ocautoupds
• agntsvc.exeagntsvc
• agntsvc.exeencsvc
• firefoxconfig
• tbirdconfig
• ocomm
• mysqld
• sql
• mysqld-nt
• mysqld-opt
• dbeng50
• sqbcoreservice

Other Details

This Ransomware terminates itself if it detects it is being run in a virtual environment.

It does the following:

• It does not proceed with its encryption routine if one of the following conditions are met:
  
  • Registry data under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Disk\Enum contains the following strings:
    • VBOX
    • Virtual
    • VMware
  • Processes contain the following strings:
    • VBox
    • prl_
    • srvc.exe
    • vmtoolsd
• It will drop this ransom note instead if it meets one of the following conditions:
  • If the OS name contains "Serv" and System Language is one of the following:
  • Arabic, Dutch, English, French, German, Italian, Korean, Portuguese, Spanish, Swedish, Bulgarian, Catalan, Czech, Danish, Greek, Estonian, Basque, Finnish, Hungarian, Japanese, Lithuanian, Norwegian, Polish, Romanian, Sami, Slovak, Slovenian, Turkish
  • The number of encrypted files is greater than 5000
  
  
• Renames the encrypted files to [(Original File Name) converted to base64]
• It encrypts fixed, removable and network drives
• It terminates if the machine has the following system language:
  • Russian
  • Belarusian
  • Ukrainian
  • Kazakh
  • Armenian
  • Georgian
  • Tatar
  • Uzbek
• Displays a fake Windows Update upon installation
  

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .r3d → if the file is in %Desktop% or its subfolders

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It avoids encrypting files with the following strings in their file name:

• README_

It avoids encrypting files found in the following folders:

• WINDOWS
• RECYCLER
• Program Files
• Program Files (x86)
• Windows
• Recycle.Bin
• RECYCLE.BIN
• Recycler
• TEMP
• APPDATA
• AppData
• Temp
• ProgramData
• Microsoft
• Burn

It appends the following extension to the file name of the encrypted files:

• .poop → if the extension is ".r3d" and is in %Desktop% or its subdirectories

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It drops the following file(s) as ransom note:

• [%Desktop% and its subdirectories]\Read Me First!.txt
• %Application Data%\Read Me First!.txt
  
• [Drive Letter]\README_[Random 7 characters].txt
• [Encrypted Folder]\README_[Random 7 characters].txt
  

It avoids encrypting files with the following file extensions:

• .lnk