RANSOM_HIDDENTEARELBAT.A

This Ransomware encrypts files with specific file extensions. It encrypts files found in specific folders. It drops files as ransom note.

Installation

This Ransomware drops the following copies of itself into the affected system and executes them:

• %User Profile%\table.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It drops the following files:

• %User Profile%\public_keyyyyyyyyyyyyy.txt -> contains Machine Name, User Name, and Public Key (multiplied with “88888888” to get the encryption key)
• %User Profile%\winsys.txt -> contains the encryption key (deleted afterwards)

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other System Modifications

This Ransomware changes the desktop wallpaper by modifying the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
WallpaperStyle = "1"

HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = "0"

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%User Temp%\wallpaper.bmp"

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

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .txt
• .doc
• .docx
• .rtf
• .contact
• .xls
• .xlsx
• .ppt
• .pptx
• .odt
• .jpg
• .png
• .csv
• .sql
• .mdb
• .sln
• .php
• .asp
• .aspx
• .html
• .jps
• .CR2
• .xml
• .psd

It encrypts files found in the following folders:

• %User Profile%\Documents
• %User Profile%\Desktop
• %User Profile%\Pictures
• %User Profile%\Downloads
• %User Profile%\Music
• %User Profile%\Dropbox
• %User Profile%\Videos
• D:\
• E:\
• F:\
• G:\
• H:\
• I:\
• J:\
• K:\
• L:\
• M:\
• N:\
• O:\
• P:\
• Q:\
• R:\
• S:\
• T:\
• U:\
• V:\
• W:\
• X:\
• Y:\

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

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

• .locked

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

• %User Temp%\wallpaper.bmp
• {malware path}\Read_me.bmp
• %Desktop%\HOW_TO_RESTORE_YOUR_FILES.txt

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It leaves text files that serve as ransom notes containing the following text:

• All your important files on this computer were locked/encrypted!!!
  - You can verify this by click on see files and try open them.
  - Encrtyption was produced using unique KEY generated for this computer.
  - Don't search for a fix on the Internet, because there is no solution.
  - To decrypted files and restore your files, you need to otbtain private key.
  - First, you need to pay 0.0133 (around 30$) Bitcoin, if you don't have Bitcoins!!
  - You can buy it from here localbitcoins.com, and pay 0.0133 Bitcoin.
  - Bitcoins have to be sent to this address: {BLOCKED}qief3h41XWzkjYy9kd72H7yQBXqZ
  - After you've sent the payment send us an email to : restoremyfiles@{BLOCKED}ta.com
  with subject : {(Machine Name)-(User Name)-(Public Key)},
  - After we confirm the payment , we send the private key so you can restore your files.
  ####You have only 48 hours to restore your files####
  Please make sure that you pay in this duration or you will lost your files forever"