RANSOM_DZSPLITTER.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 is capable of encrypting files in the affected system.

It encrypts files found in specific folders. 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 component file(s):

• %User Temp%\786B.tmp\Read@My.vbs - Voice Note that will be deleted after execution

(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.)

It drops and executes the following files:

• %User Profile%\AppData\Local\temppicc.exe - Changes the Desktop Wallpaper
• %User Profile%\AppData\Local\tempspesh.exe - Triggers the Ransom Voice Msg Note

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

Other Details

This Ransomware encrypts files with the following extensions:

• .txt
• .doc
• .docx
• .mp3
• .xls
• .xlsx
• .ppt
• .sql
• .wmv
• .mp4
• .mp3
• .iso
• .dll
• .jar
• .pptx
• .odt
• .jpg
• .tar
• .gz
• .bmp
• .pbm
• .rtf
• .png
• .csv
• .sql
• .mdb
• .sln
• .php\"
• .avi
• .mov
• .flv
• .amv
• .mpv
• .mtv
• .asp
• .aspx
• .html
• .xml
• .psd
• .pdf
• .exe
• .rv
• .rvx
• .ved
• .wm
• .wmv
• .TXT
• .JPG
• .rar
• .xwmv
• .wma
• .midi
• .fla
• .pdf
• .wma
• .ico
• .gif
• .GIF
• .ogg
• .mpg
• .icns
• .RAR
• .png
• .zip
• .BAT
• .Exe
• .c
• .exe
• .PNG
• .iso
• .7z
• .7Z

It is capable of encrypting files in the affected system.

Ransomware Routine

This Ransomware encrypts files found in the following folders:

• %Favorites%
• %User Startup%
• %Program Files%
• %Application Data%
• %User Profile%\Documents
• %User Profile%\Pictures
• %User Profile%\Desktop
• %User Profile%\Music
• %Application Data%\Microsoft\Windows\Start Menu\Programs

(Note: %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.. %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.. %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.. %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.)

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

• .Isis

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

• %%Application Data%%\img.jpg - Wallpaper Ransom Note
• %Desktop%\@-Decrypt-@.txt

(Note: %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.)

NOTES:

This ransomware displays the following as ransom note:

The following is the dropped text file: