Boot.BAT.MEMZ.A

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

The said files contain data it writes into the MBR (Master Boot Record). It does the said action to enable it to start even before the operating system is loaded.

Arrival Details

This Boot malware 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 Boot malware drops the following files:

• %Application Data%\MEMZ-Destructive.exe
• %System Root%\note.txt
• {original filepath}\x
• {original filepath}\x.js
• {original filepath}\z.zip

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

It adds the following processes:

• cscript x.js
• "%Application Data%\MEMZ-Destructive.exe"
• "%Application Data%\MEMZ-Destructive.exe" /watchdog
• "%Application Data%\MEMZ-Destructive.exe" /main
• "%System%\notepad.exe" \note.txt
• "%Program Files%\Internet Explorer\iexplore.exe" -nohome
• Random Windows Default Applications/Configurations (e.g. notepad, taskmanager, calculator, etc.)

(Note: %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).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

This Boot malware e said files contain data it writes into the MBR (Master Boot Record). It does the said action to enable it to start even before the operating system is loaded.

Other Details

This Boot malware does the following:

• Prompts user in allowing malware payload
• Searches random subjects on google.co.ck using Internet Explorer
• Periodically inverts screen color
• Randomly prompts message boxes
• Randomly moves the cursor
• Randomly opens Windows Default Applications/Configurations (calc.exe, msconf etc.)
• Upon restart, user will be unable to proceed to Windows and will instead show a Nyan Cat with counter
• Plays sound during payload
• Modifies cursor to have an error icon to follow it