RANSOM_HIDDENTEARMAY.A

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 connects to certain websites to send and receive information. It deletes itself after execution.

It encrypts files with specific file extensions. It drops files as ransom note.

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:

• {Malware Directory}\de.bat ← used to delete self
• %Application Data%\del1.bat ← used to execute commands

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

Other Details

This Ransomware connects to the following website to send and receive information:

• https://{BLOCKED}are.{BLOCKED}ons/1/target.php?id={guid}&key={key}

It does the following:

• Renames files with following extensions to {Original File Name and Extension}.locked and try to set their attribute to hidden(doesn't encrypt):
  • .zip
  • .ldf
  • .ndf
  • .err
  • .myd
  • .mpg
  • .vhd
  • .iso
  • .pst
  • .bkf
  • .bak
• Run %Application Data%\del1.bat to try and execute the following commands:
  • vssadmin delete shadows /all /quiet
  • bcedit.exe /set {default} recovery enabled no
  • bcedit.exe /set {default} bootstatuspolicy ignoreallfailures

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

It deletes itself after execution.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .MYOX
• .GPS
• .gps
• .PNG
• .png
• .MDF
• .ldf
• .mdf
• .trn
• .pdf
• .myi
• .prn
• .data
• .ctf
• .mkd
• .ziz
• .pxf
• .dst
• .eps
• .tlf
• .ltf
• .cdr
• .pmd
• .ai
• .txt
• .qbw
• .QBB
• .qbb
• .QBW
• .TLG
• .JPG
• .tlg
• .ecw
• .pdf
• .DBF
• .PDF
• .frm
• .pix
• .accdb
• .mdb
• .cdr
• .eps
• .tif
• .msg
• .asmx
• .rpt
• .arw
• .qbo
• .qbw
• .sldprt
• .dwf
• .doc
• .adi
• .adt
• .docx
• .altr
• .xls
• .xlsx
• .ppt
• .pptx
• .odt
• .jpg
• .png
• .csv
• .sql
• sln
• .php
• .asp
• .aspx
• .html
• .xml
• .psd
• .bat
• .js
• .css
• .sqlite
• .dwg
• .jpeg

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

• Program Files
• Windows
• Program Data

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

• .locked

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

• {Encrypted file directory}\Restore_your_files.txt

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