RANSOM_DONUT.THFAAAH

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 connects to a website to send and receive information.

It encrypts files with specific file extensions.

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 files:

• %User Temp%\wallpaper.bmp - this ransomware will set the affected computer's wallpaper to this.
• %User Temp%\{Affected machine's unique ID}.exe - Changes the system's Desktop, opens a window showing the ransom note and displays a donut rolling around the bottom of the desktop.

(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 leaves text files that serve as ransom notes containing the following:

• {Location of encrypted file}\decrypt.txt

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
donut.exe = %User Temp%\{Affected machine's unique ID}.exe

Other System Modifications

This Ransomware changes the desktop wallpaper by modifying the following registry entries:

HKCU\Control Panel\Desktop
WallpaperStyle = 1

(Note: The default value data of the said registry entry is 0.)

HKCU\Control Panel\Desktop
TileWallpaper = 1

(Note: The default value data of the said registry entry is 1.)

HKCU\Control Panel\Desktop
Wallpaper = %User Temp%\wallpaper.bmp

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

Backdoor Routine

This Ransomware connects to the following websites to send and receive information:

• http://{BLOCKED}.{BLOCKED}.48.80/donut/client.php

It posts the following information to its command and control (C&C) server:

• Affected machine's unique ID
• Affected machine's unique key
• Affected machine's OS version

Other Details

This Ransomware does the following:

• Displays the following window that shows the ransom note:
  
• Displays a donut rolling on the bottom of the desktop:
  

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .eml
• .eps
• .erbsql
• .erf
• .exf
• .fdb
• .ffd
• .fff
• .fh
• .fhd
• .fla
• .flac
• .flb
• .flf
• .flv
• .flvv
• .forge
• .fpx
• .fxg
• .gbr
• .gho
• .gif
• .gray
• .grey
• .groups
• .gry
• .h
• .hbk
• .hdd
• .hpp
• .html
• .ibank
• .ibd
• .ibz
• .idx
• .iif
• .iiq
• .incpas
• .indd
• .info
• .info_
• .ini
• .iwi
• .jar
• .java
• .jnt
• .jpe
• .jpeg
• .jpg
• .js
• .json
• .k2p
• .kc2
• .kdbx
• .kdc
• .key
• .kpdx
• .kwm
• .laccdb
• .lbf
• .lck
• .ldf
• .lit
• .litemod
• .litesql
• .lock
• .log
• .ltx
• .lua
• .m
• .m2ts
• .m3u
• .m4a
• .m4p
• .m4v
• .ma
• .mab
• .mapimail
• .max
• .mbx
• .md
• .mdb
• .mdc
• .mdf
• .mef
• .mfw
• .mid
• .mkv
• .mlb
• .mmw
• .mny
• .money
• .moneywell
• .mos
• .mov
• .mp3
• .mp4
• .mpeg
• .mpg
• .mrw
• .msf
• .msg
• .myd
• .nd
• .ndd
• .ndf
• .nef
• .nk2
• .nop
• .nrw
• .ns2
• .ns3
• .ns4
• .nsd
• .nsf
• .nsg
• .nsh
• .nvram
• .nwb
• .nx2
• .nxl
• .nyf
• .oab
• .obj
• .odb
• .odc
• .odf
• .odg
• .odm
• .odp
• .ods
• .odt
• .ogg
• .oil
• .omg
• .one
• .orf
• .ost
• .otg
• .oth
• .otp
• .ots
• .ott
• .p12
• .p7b
• .p7c
• .pab
• .pages
• .pas
• .pat
• .pbf
• .pcd
• .pct
• .pdb
• .pdd
• .pdf
• .pef
• .pem
• .pfx
• .php
• .pif
• .pl
• .plc
• .plus_muhd
• .pm!
• .pm
• .pmi
• .pmj
• .pml
• .pmm
• .pmo
• .pmr
• .pnc
• .pnd
• .png
• .pnx
• .pot
• .potm
• .potx
• .ppam
• .pps
• .ppsm
• .ppsx
• .ppt
• .pptm
• .pptx
• .prf
• .private
• .ps
• .psafe3
• .psd
• .pspimage
• .pst
• .ptx
• .pub
• .pwm
• .py
• .qba
• .qbb
• .qbm
• .qbr
• .qbw
• .qbx
• .qby
• .qcow
• .qcow2
• .qed
• .qtb
• .r3d
• .raf
• .rar
• .rat
• .raw
• .rdb
• .re4
• .rm
• .rtf
• .rvt
• .rw2
• .rwl
• .rwz
• .s3db
• .safe
• .sas7bdat
• .sav
• .save
• .say
• .sd0
• .sda
• .sdb
• .sdf
• .sh
• .sldm
• .sldx
• .slm
• .sql
• .sqlite
• .sqlite3
• .sqlitedb
• .sqlite-shm
• .sqlite-wal
• .sr2
• .srb
• .srf
• .srs
• .srt
• .srw
• .st4
• .st5
• .st6
• .st7
• .st8
• .stc
• .std
• .sti
• .stl
• .stm
• .stw
• .stx
• .svg
• .swf
• .sxc
• .sxd
• .sxg
• .sxi
• .sxm
• .sxw
• .tax
• .tbb
• .tbk
• .tbn
• .tex
• .tga
• .thm
• .tif
• .tiff
• .tlg
• .tlx
• .txt
• .upk
• .usr
• .vbox
• .vdi
• .vhd
• .vhdx
• .vmdk
• .vmsd
• .vmx
• .vmxf
• .vob
• .vpd
• .vsd
• .wab
• .wad
• .wallet
• .war
• .wav
• .wb2
• .wma
• .wmf
• .wmv
• .wpd
• .wps
• .x11
• .x3f
• .xis
• .xla
• .xlam
• .xlk
• .xlm
• .xlr
• .xls
• .xlsb
• .xlsm
• .xlsx
• .xlt
• .xltm
• .xltx
• .xlw
• .xml
• .xps
• .xxx
• .ycbcra
• .yuv
• .zip
• .1cd
• .3dm
• .3ds
• .3fr
• .3g2
• .3gp
• .3pr
• .7z
• .7zip
• .aac
• .ab4
• .abd
• .acc
• .accdb
• .accde
• .accdr
• .accdt
• .ach
• .acr
• .act
• .adb
• .adp
• .ads
• .agdl
• .ai
• .aiff
• .ait
• .al
• .aoi
• .apj
• .apk
• .arw
• .ascx
• .asf
• .asm
• .asp
• .aspx
• .asset
• .asx
• .atb
• .avi
• .awg
• .back
• .backup
• .backupdb
• .bak
• .bank
• .bay
• .bdb
• .bgt
• .bik
• .bin
• .bkp
• .blend
• .bmp
• .bpw
• .bsa
• .c
• .cash
• .cdb
• .cdf
• .cdr
• .cdr3
• .cdr4
• .cdr5
• .cdr6
• .cdrw
• .cdx
• .ce1
• .ce2
• .cer
• .cfg
• .cfn
• .cgm
• .cib
• .class
• .cls
• .cmt
• .config
• .contact
• .cpi
• .cpp
• .cr2
• .craw
• .crt
• .crw
• .cry
• .cs
• .csh
• .csl
• .css
• .csv
• .d3dbsp
• .dac
• .das
• .dat
• .db
• .db_journal
• .db3
• .dbf
• .dbx
• .dc2
• .dcr
• .dcs
• .ddd
• .ddoc
• .ddrw
• .dds
• .def
• .der
• .des
• .design
• .dgc
• .dgn
• .dit
• .djvu
• .dng
• .doc
• .docm
• .docx
• .dot
• .dotm
• .dotx
• .drf
• .drw
• .dtd
• .dwg
• .dxb
• .dxf
• .dxg
• .edb

It avoids encrypting files with the following strings in their file name:

• desktop.ini
• autorun.inf
• ntuser.dat
• iconcache.db
• bootsect.bak
• boot.ini
• ntuser.dat.log
• thumbs.db

It avoids encrypting files found in the following folders:

• ProgramData
• Program Files
• Program Files (x86)
• Windows
• All Users
• Local Settings
• AppData
• lulu
• $RECYCLE
• System Volume Information

It leaves text files that serve as ransom notes containing the following text:

• Hi.
  All your files have been ENCRYPTED by DONUT Ransomware.
  Do you want to restore your files?
  Your should buy DonutDecryptor.
  Current Price $100.
  For payment your need cryptocurrency itCoin.
  Write to our email - {BLOCKED}mm @{BLOCKED}ta.com
  and tell us your unique ID and BitCoin transaction.
  Your Uniq ID is: {BLOCKED}XoIhswmqWcJSG9LH9X1ZFyAXKk
  BitCoin wallet is: {BLOCKED}beF1yLGRCUmVdgiDWMD7yRspJX8C