Ransom.Win32.GORGON.THOABHAI

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 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 adds the following processes:

• "cmd.exe" /c vssadmin.exe delete shadows /all /quiet

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

• check

Other System Modifications

This Ransomware sets the system's desktop wallpaper to the following image:

Other Details

This Ransomware does the following:

• It displays the following window after encrypting files:
  
• It drops the following file(s) as ransom note:
  • {Drive Letter}:\#DECRYPT MY FILES#.HTML
  • {Drive Letter}:\#解密我的文件#.HTML
  • {Drive Letter}:\#내 파일 복구하기#.HTML
  • %Desktop%\#DECRYPT MY FILES#.HTML
  • %Desktop%\#解密我的文件#.HTML
  • %Desktop%\#내 파일 복구하기#.HTML
• The ransom note contains the following:
  
• It creates the following registry entries in order to display its ransom note every time the Windows startup:

  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
  Windows NT\CurrentVersion\Winlogon
  LegalNoticeCaption = "All your important
  files are encrypted!"

  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
  Windows NT\CurrentVersion\Winlogon
  LegalNoticeText = "{Contents are same
  as ransom notes}"

  
  
• It accessed the shortened URL https://{BLOCKED}er.org/2nZ7w5 that leads to https://i.{BLOCKED}i.net/2019/01/24/5c49d7ec69126.png, an online image hosting site.
• It downloads an image file from an online image hosting site.
  • URL: https://i.{BLOCKED}i.net/2019/01/24/5c49d80a2b878.bmp
  • Filename: %Desktop%\WALLPAPER.BMP
• It uses speech synthesis and says the following:
  • Attention! Your documents, images, databases and other important files have been encrypted!

It is capable of encrypting files in the affected system.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .1cd
• .3dm
• .3ds
• .3fr
• .3g2
• .3pr
• .7z
• .7zip
• .aac
• .ab4
• .accdb
• .accde
• .accdr
• .accdt
• .ach
• .acr
• .act
• .adb
• .adp
• .advertisements
• .agdl
• .ai
• .ait
• .al
• .aoi
• .ape
• .apj
• .apk
• .arc
• .arw
• .asf
• .asm
• .asp
• .aspx
• .asx
• .avi
• .awg
• .back
• .backup
• .backupdb
• .bak
• .bat
• .bay
• .bdb
• .bgt
• .bik
• .bpw
• .c
• .c4d
• .cdr
• .cdr3
• .cdr4
• .cdr5
• .cdr6
• .cdrw
• .ce1
• .ce2
• .cer
• .cfg
• .cib
• .class
• .cls
• .cmd
• .conf
• .config
• .contact
• .cpi
• .cpp
• .craw
• .crw
• .cs
• .csh
• .csl
• .css
• .csv
• .db
• .db3
• .dbx
• .db_journal
• .dc2
• .dcs
• .ddoc
• .ddrw
• .dds
• .der
• .des
• .dgc
• .dip
• .djvu
• .dng
• .doc
• .docb
• .docm
• .docx
• .dot
• .dotm
• .dotx
• .drf
• .drw
• .dwg
• .dxb
• .dxf
• .dxg
• .eml
• .eps
• .epub
• .erbsql
• .erf
• .exf
• .ffd
• .fh
• .fhd
• .fla
• .flac
• .flf
• .flp
• .flv
• .frm
• .fxg
• .gif
• .gpg
• .gray
• .grey
• .groups
• .gry
• .hbk
• .hdd
• .hpp
• .html
• .ibd
• .ibz
• .idx
• .iiq
• .incpas
• .jar
• .java
• .jnt
• .jpe
• .jpg
• .js
• .jsp
• .jtp
• .kc2
• .kdbx
• .kdc
• .key
• .kpdx
• .kwm
• .laccdb
• .lay
• .lay6
• .ldf
• .lit
• .log
• .lua
• .m
• .m2ts
• .m3u
• .m4p
• .m4u
• .m4v
• .max
• .mbx
• .md
• .mdb
• .mdc
• .mdf
• .mef
• .mfw
• .mid
• .mkv
• .mlb
• .mml
• .mmw
• .mny
• .mov
• .mp3
• .mp4
• .mpeg
• .mpg
• .mrw
• .msg
• .myd
• .myi
• .ndd
• .ndf
• .nef
• .nk2
• .nop
• .nrw
• .ns2
• .ns3
• .ns4
• .nvram
• .nwb
• .nx2
• .nxl
• .nyf
• .oab
• .obj
• .odb
• .odf
• .odg
• .odm
• .ods
• .odt
• .ogg
• .oil
• .onetoc2
• .orf
• .ost
• .otg
• .oth
• .otp
• .ots
• .ott
• .p12
• .p7b
• .p7c
• .pab
• .pages
• .paq
• .pcd
• .pct
• .pdb
• .pdd
• .pdf
• .pem
• .php
• .pif
• .pl
• .plc
• .plus_muhd
• .png
• .pot
• .potm
• .potx
• .ppam
• .pps
• .ppsm
• .ppsx
• .ppt
• .pptm
• .pptx
• .prf
• .ps
• .ps1
• .psafe3
• .psd
• .pst
• .pwm
• .py
• .qba
• .qbr
• .qbw
• .qbx
• .qby
• .qcow
• .qcow2
• .qed
• .r3d
• .raf
• .rar
• .rat
• .raw
• .rdb
• .rm
• .rtf
• .rvt
• .rw2
• .rwl
• .rwz
• .s3db
• .safe
• .sav
• .save
• .sch
• .sd0
• .sda
• .sdf
• .sldm
• .sldx
• .slk
• .sln
• .snt
• .sql
• .sqlite
• .sqlite3
• .sqlitedb
• .sr2
• .srf
• .srt
• .srw
• .st5
• .st7
• .st8
• .std
• .sti
• .stm
• .stx
• .suo
• .svg
• .swf
• .sxd
• .sxg
• .sxi
• .sxm
• .sxw
• .tex
• .tga
• .tgz
• .thm
• .tif
• .tiff
• .txt
• .uop
• .uot
• .vb
• .vbox
• .vbs
• .vcd
• .vdi
• .vhd
• .vhdx
• .vip
• .vmdk
• .vmsd
• .vmx
• .vmxf
• .vob
• .wab
• .wallet
• .wav
• .wb2
• .wk1
• .wks
• .wma
• .wmv
• .wpd
• .wps
• .x11
• .x3f
• .xis
• .xla
• .xlam
• .xlc
• .xlm
• .xlr
• .xls
• .xlsb
• .xlsm
• .xlsx
• .xlt
• .xltm
• .xltx
• .xlw
• .xml
• .ycbcra
• .yuv
• .zip

It encrypts files found in the following folders:

• {Drive Letter}:\
• %ProgramData%
• %Favorites%
• %User Profile%\Documents
• %User Profile%\Pictures
• %User Profile%\Music
• %AppDataLocal%\Microsoft\Windows\History
• %User Profile%\Downloads
• %User Profile%\Videos
• %Desktop%

(Note: %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.. %Favorites% is the current user's Favorites folder, which is usually C:\Documents and Settings\{user name}\Favorites on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Favorites on Windows Vista, 7, and 8.. %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, 7, and 8.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista, 7, and 8.)

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

• .[buy-decryptor@{BLOCKED}m.me]