RANSOM_FILECRYPTOR.R011C0DB618

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 encrypts files with specific file extensions. It encrypts files found in specific folders.

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 and executes the following files:

• {malware file path}\p{random digits}h.exe

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
Crypt = %User Startup%\HTCryptor.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Message = %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\Message.exe

It drops the following file(s) in the Windows Common Startup folder to enable its automatic execution at every system startup:

• %User Startup%\HTCryptor.exe - Copy of the dropped and executed file "{malware file path}\p{random digits}h.exe"

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Other System Modifications

This Ransomware deletes the following files:

• {malware file path}\p{random digits}h.exe

Dropping Routine

This Ransomware drops the following files:

• %Start Menu%\Programs\Startup\HTDecryptor.exe
• %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\HTDecryptor.exe
• %Desktop%\HTDecryptor.exe
• %System Root%\Users\Public\Desktop\HTDecryptor.exe
• %Start Menu%\HTDecryptor.exe
• %Program Files%\HTDecryptor.exe
• %User Profile%\Documents\HTDecryptor.exe
• %User Profile%\Videos\HTDecryptor.exe
• %User Profile%\Pictures\HTDecryptor.exe
• %User Profile%\Music\HTDecryptor.exe
• %Start Menu%\Programs\Startup\message.exe
• %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\Message.exe

(Note: %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu 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.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.. %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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %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 Details

This Ransomware connects to the following URL(s) to check for an Internet connection:

• http://www.websitetest.com/

It does the following:

• By random chance, the malware may display the following box:
  
• The malware disables Windows firewall using the following commands:
  • netsh firewall set opmode disable
• After its encryption routine, it executes the dropped file message.exe which displays the following window which serves as its ransom note:
  

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .txt
• .doc
• .docx
• .log
• .msg
• .odt
• .pages
• .rtf
• .tex
• .wpd
• .wps
• .csv
• .dat
• .ged
• .key
• .keychain
• .pps
• .ppt
• .pptx
• .sdf
• .tar
• .tax2014
• .tax2015
• .vcf
• .xml
• .aif
• .iff
• .m3u
• .m4a
• .mid
• .mp3
• .mpa
• .wav
• .wma
• .3g2
• .3gp
• .asf
• .avi
• .flv
• .m4v
• .mov
• .mp4
• .mpg
• .rm
• .srt
• .swf
• .vob
• .wmv
• .3dm
• .3ds
• .max
• .obj
• .bmp
• .dds
• .gif
• .jpg
• .png
• .psd
• .tga
• .thm
• .tif
• .tiff
• .yuv
• .ai
• .eps
• .ps
• .svg
• .indd
• .pct
• .pdf
• .xlr
• .xls
• .xlsx
• .accdb
• .db
• .dbf
• .mdb
• .pdb
• .sql
• .dwg
• .dxf
• .asp
• .aspx
• .cer
• .cfm
• .csr
• .css
• .htm
• .html
• .js
• .jsp
• .php
• .rss
• .xhtml
• .7z
• .cbr
• .deb
• .gz
• .pkg
• .rar
• .rpm
• .sitx
• .tar.gz
• .zip
• .zipx
• .bin
• .cue
• .dmg
• .iso
• .mdf
• .toast
• .vcd
• .c
• .class
• .cpp
• .cs
• .dtd
• .fla
• .h
• .java
• .lua
• .m
• .pl
• .py
• .sh
• .sln
• .swift
• .vb
• .vcxproj
• .xcodeproj
• .bak
• .tmp
• .crdownload
• .ics
• .msi
• .part
• .torrent

It encrypts files found in the following folders:

• All logical drives and its subdirectories
• %Application Data%\Microsoft\Windows\Recent
• %User Profile%\Pictures
• %User Profile%\Music
• %User Profile%\Videos
• %User Profile%\Documents
• %Favorites%
• %System Root%\Users\Public\Documents
• %System Root%\Users\Public\Pictures
• %System Root%\Users\Public\Music
• %System Root%\Users\Public\Videos
• %System Root%\Users\Public\Desktop

(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.. %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.. %Favorites% is the Favorites folder, where it usually is C:\Documents and Settings\{user name}\Favorites on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Favorites 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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

NOTES:

Due to coding errors on this ransomware, it is not able to proceed to its encryption routine, disable windows firewall, connect to check internet connection, dropping HTDecryptor.exe and message.exe files, addition of message.exe to startup registry, and the execution of message.exe.