Ransom_CRYSIS.CBD

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 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 copies of itself into the affected system:

• %System%\{Malware Filename}.exe ← (if admin)
• %Application Data%\{Malware Filename}.exe ← (if non-admin)

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• Global\syncronize_8XT2IZA
• Global\syncronize_8XT2IZU

Autostart Technique

This Ransomware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware Filename} = "%System%\{Malware Filename}"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware Filename} = "%Application Data%\{Malware Filename}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware Filename} = "%Application Data%\{Malware Filename}"

It enables its automatic execution at every system startup by dropping the following copies of itself into the Windows Common Startup folder:

• %User Startup%\{Malware Filename}.exe
• %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\{Malware Filename}.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData in Windows Vista, 7, and 8.)

Other System Modifications

This Ransomware adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
%System%\Info.hta = "mshta.exe "%System%\Info.hta""

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
%Application Data%\Info.hta = "mshta.exe "%Application Data%\Info.hta""

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
%Application Data%\Info.hta = "mshta.exe "%Application Data%\Info.hta""

Process Termination

This Ransomware terminates the following services if found on the affected system:

• FirebirdGuardianDefaultInstance
• FirebirdServerDefaultInstance
• sqlwriter
• mssqlserver
• sqlserveradhelper
• Windows Driver Foundation - User-mode Driver Framework

It terminates the following processes if found running in the affected system's memory:

• 1c8.exe
• 1cv77.exe
• outlook.exe
• postgres.exe
• mysqld-nt.exe
• mysqld.exe
• sqlservr.exe

Other Details

This Ransomware does the following:

• It deletes shadow copies by executing the following command:
  • vssadmin delete shadows /all /quiet
• It sets the currently active code page to 1251 by executing the following command:
  • mode con cp select=1251
• It avoids encrypting files/directories with the following strings:
  • %Windows%
  • boot.ini
  • bootfont.bin
  • ntldr
  • ntdetect.com
  • io.sys
  • FILES ENCRYPTED.txt
  • Info.hta
  • {Malware Filename}.exe
• It encrypts files in all fixed, remote and removable drives.

It is capable of encrypting files in the affected system.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .1cd
• .3ds
• .3fr
• .3g2
• .3gp
• .7z
• .accda
• .accdb
• .accdc
• .accde
• .accdt
• .accdw
• .adb
• .adp
• .ai
• .ai3
• .ai4
• .ai5
• .ai6
• .ai7
• .ai8
• .anim
• .arw
• .as
• .asa
• .asc
• .ascx
• .asm
• .asmx
• .asp
• .aspx
• .asr
• .asx
• .avi
• .avs
• .backup
• .bak
• .bay
• .bd
• .bin
• .bmp
• .bz2
• .c
• .cdr
• .cer
• .cf
• .cfc
• .cfm
• .cfml
• .cfu
• .chm
• .cin
• .class
• .clx
• .config
• .cpp
• .cr2
• .crt
• .crw
• .cs
• .css
• .csv
• .cub
• .dae
• .dat
• .db
• .dbf
• .dbx
• .dc3
• .dcm
• .dcr
• .der
• .dib
• .dic
• .dif
• .divx
• .djvu
• .dng
• .doc
• .docm
• .docx
• .dot
• .dotm
• .dotx
• .dpx
• .dqy
• .dsn
• .dt
• .dtd
• .dwg
• .dwt
• .dx;
• .dxf
• .edml
• .efd
• .elf
• .emf
• .emz
• .epf
• .eps
• .epsf
• .epsp
• .erf
• .exr
• .f4v
• .fido
• .flm
• .flv
• .frm
• .fxg
• .geo
• .gif
• .grs
• .gz
• .h
• .hdr
• .hpp
• .hta
• .htc
• .htm
• .html
• .icb
• .ics
• .iff
• .inc
• .indd
• .ini
• .iqy
• .j2c
• .j2k
• .java
• .jp2
• .jpc
• .jpe
• .jpeg
• .jpf
• .jpg
• .jpx
• .js
• .jsf
• .json
• .jsp
• .kdc
• .kmz
• .kwm
• .lasso
• .lbi
• .lgf
• .lgp
• .log
• .m1v
• .m4a
• .m4v
• .max
• .md
• .mda
• .mdb
• .mde
• .mdf
• .mdw
• .mef
• .pam
• .pbm
• .pct
• .pcx
• .pdd
• .pdf
• .pdp
• .pef
• .pem
• .pff
• .pfm
• .pfx
• .pgm
• .php
• .php3
• .php4
• .php5
• .phtml
• .pict
• .pl
• .pls
• .pm
• .png
• .pnm
• .pot
• .potm
• .potx
• .ppa
• .ppam
• .ppm
• .pps
• .ppsm
• .ppt
• .pptm
• .pptx
• .prn
• .ps
• .psb
• .psd
• .pst
• .ptx
• .pub
• .pwm
• .pxr
• .py
• .qt
• .r3d
• .raf
• .rar
• .raw
• .rdf
• .rgbe
• .rle
• .rqy
• .rss
• .rtf
• .rw2
• .rwl
• .safe
• .sct
• .sdpx
• .shtm
• .shtml
• .slk
• .sln
• .sql
• .sr2
• .srf
• .srw
• .ssi
• .st
• .stm
• .svg
• .svgz
• .swf
• .tab
• .tar
• .tbb
• .tbi
• .tbk
• .tdi
• .tga
• .thmx
• .tif
• .tiff
• .tld
• .torrent
• .tpl
• .txt
• .u3d
• .udl
• .uxdc
• .vb
• .vbs
• .vcs
• .vda
• .vdr
• .vdw
• .vdx
• .vrp
• .vsd
• .vss
• .vst
• .vsw
• .vsx
• .vtm
• .vtml
• .vtx
• .wb2
• .wav
• .wbm
• .wbmp
• .wim
• .wmf
• .wml
• .wmv
• .wpd
• .wps
• .x3f
• .xl
• .xla
• .xlam
• .xlk
• .xlm
• .xls
• .xlsb
• .xlsm
• .xlsx
• .xlt
• .xltm
• .xltx
• .xlw
• .xml
• .xps
• .xsd
• .xsf
• .xsl
• .xslt
• .xsn
• .xtp
• .xtp2
• .xyze
• .xz
• .zip
• .mft
• .mfw
• .mht
• .mhtml
• .mka
• .mkidx
• .mkv
• .mos
• .mov
• .mp3
• .mp4
• .mpeg
• .mpg
• .mpv
• .mrw
• .msg
• .mxl
• .myd
• .myi
• .nef
• .nrw
• .obj
• .odb
• .odc
• .odm
• .odp
• .ods
• .oft
• .one
• .onepkg
• .onetoc2
• .opt
• .oqy
• .orf
• .p12
• .p7b
• .p7c

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

• id-{ID}.[{BLOCKED}thelp@qq.com].arrow

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

• %Application Data%\Info.hta Shows the following Ransom Note
  
• %System%\Info.hta
• %User Startup%\Info.hta
• %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta
• {All Drives}\FILES ENCRYPTED.txt
• %Desktop%\FILES ENCRYPTED.txt Shows the following Ransom note