RANSOM_JCODER.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 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.

Other Details

This Ransomware encrypts files with the following extensions:

• .doc
• .docx
• .xls
• .xlsx
• .ppt
• .pptx
• .pst
• .ost
• .msg
• .eml
• .vsd
• .vsdx
• .txt
• .csv
• .rtf
• .123
• .wks
• .wk1
• .pdf
• .dwg
• .onetoc2
• .snt
• .jpeg
• .jpg
• .docb
• .docm
• .dot
• .dotm
• .dotx
• .xlsm
• .xlsb
• .xlw
• .xlt
• .xlm
• .xlc
• .xltx
• .xltm
• .pptm
• .pot
• .pps
• .ppsm
• .ppsx
• .ppam
• .potx
• .potm
• .edb
• .hwp
• .602
• .sxi
• .sti
• .sldx
• .sldm
• .sldm
• .vdi
• .vmdk
• .vmx
• .gpg
• .aes
• .ARC
• .PAQ
• .bz2
• .tbk
• .bak
• .tar
• .tgz
• .gz
• .7z
• .rar
• .zip
• .backup
• .iso
• .vcd
• .bmp
• .png
• .gif
• .raw
• .cgm
• .tif
• .tiff
• .nef
• .psd
• .ai
• .svg
• .djvu
• .m4u
• .m3u
• .mid
• .wma
• .flv
• .3g2
• .mkv
• .3gp
• .mp4
• .mov
• .avi
• .asf
• .mpeg
• .vob
• .mpg
• .wmv
• .fla
• .swf
• .wav
• .mp3
• .sh
• .class
• .jar
• .java
• .rb
• .asp
• .php
• .jsp
• .brd
• .sch
• .dch
• .dip
• .pl
• .vb
• .vbs
• .ps1
• .bat
• .cmd
• .js
• .asm
• .h
• .pas
• .cpp
• .c
• .cs
• .suo
• .sln
• .ldf
• .mdf
• .ibd
• .myi
• .myd
• .frm
• .odb
• .dbf
• .db
• .mdb
• .accdb
• .sql
• .sqlitedb
• .sqlite3
• .asc
• .lay6
• .lay
• .mml
• .sxm
• .otg
• .odg
• .uop
• .std
• .sxd
• .otp
• .odp
• .wb2
• .slk
• .dif
• .stc
• .sxc
• .ots
• .ods
• .3dm
• .max
• .3ds
• .uot
• .stw
• .sxw
• .ott
• .odt
• .pem
• .p12
• .csr
• .crt
• .key
• .pfx
• .der
• .ico
• .exe
• .cat
• .dll

Ransomware Routine

This Ransomware encrypts files found in the following folders:

• %User Profile%\Documents
• %User Profile%\Music
• %User Profile%\Videos
• %User Profile%\Pictures
• %User Profile%\Desktop
• %Windows%
• %Program Files%
• %User Profile%\Favorites
• %User Profile%\Local Settings\History
• %Application Data%\Microsoft\Windows\Recent
• %Start Menu%
• %System%
• %User Profile%\Templates
• %User Profile%\Download
• %Start Menu%\Programs\Administrative Tools
• %AppDataLocal%\Microsoft\Windows\Burn\Temporary Burn Folder
• %Start Menu%\Programs\Startup

(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.. %Windows% is the Windows folder, where it usually is C:\Windows 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.. %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.. %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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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 appends the following extension to the file name of the encrypted files:

• .HDK

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

• {folders of encrypted files}\HDK.txt

NOTES:
This ransomware will display the following window after execution:

The content of the ransom note text file looks like: