RANSOM_CRYPJAFF.B

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 certain websites to send and receive information. It deletes itself after execution.

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 files:

• %All Users Profile%\Application Data\Rondo\backup.om
• %All Users Profile%\Application Data\Rondo\WallpapeR.bmp

(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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 creates the following folders:

• %All Users Profile%\Application Data\Rondo

(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.)

Other System Modifications

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

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = %All Users Profile%\Application Data\Rondo\WallpapeR.bmp

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

It modifies the Internet Explorer Privacy Settings.

Other Details

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

• http://{BLOCKED}rriddows.com/a5/

It deletes itself after execution.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .xlsx
• .acd
• .pdf
• .pfx
• .crt
• .der
• .cad
• .dwg
• .MPEG
• .rar
• .veg
• .zip
• .txt
• .jpg
• .doc
• .wbk
• .mdb
• .vcf
• .docx
• .ics
• .vsc
• .mdf
• .dsr
• .mdi
• .msg
• .xls
• .ppt
• .pps
• .obd
• .mpd
• .dot
• .xlt
• .pot
• .obt
• .htm
• .html
• .mix
• .pub
• .vsd
• .png
• .ico
• .rtf
• .odt
• .3dm
• .3ds
• .dxf
• .max
• .obj
• .7z
• .cbr
• .deb
• .gz
• .rpm
• .sitx
• .tar
• .tar
• .gz
• .zipx
• .aif
• .iff
• .m3u
• .m4a
• .mid
• .key
• .vib
• .stl
• .psd
• .ova
• .xmod
• .wda
• .prn
• .zpf
• .swm
• .xml
• .xlsm
• .par
• .tib
• .waw
• .001
• .002
• .003
• .004
• .005
• .006
• .007
• .008
• .009
• .010
• .contact
• .dbx
• .jnt
• .mapimail
• .oab
• .ods
• .ppsm
• .pptm
• .prf
• .pst
• .wab
• .1cd
• .3g2
• .7ZIP
• .accdb
• .aoi
• .asf
• .asp
• .aspx
• .asx
• .avi
• .bak
• .cer
• .cfg
• .class
• .config
• .css
• .csv
• .db
• .dds
• .fif
• .flv
• .idx
• .js
• .kwm
• .laccdb
• .idf
• .lit
• .mbx
• .md
• .mlb
• .mov
• .mp3
• .mp4
• .mpg
• .pages
• .php
• .pwm
• .rm
• .safe
• .sav
• .save
• .sql
• .srt
• .swf
• .thm
• .vob
• .wav
• .wma
• .wmv
• .xlsb
• .aac
• .ai
• .arw
• .c
• .cdr
• .cls
• .cpi
• .cpp
• .cs
• .db3
• .docm
• .dotm
• .dotx
• .drw
• .dxb
• .eps
• .fla
• .flac
• .fxg
• .java
• .m
• .m4v
• .pcd
• .pct
• .pl
• .potm
• .potx
• .ppam
• .ppsx
• .ps
• .pspimage
• .r3d
• .rw2
• .sldm
• .sldx
• .svg
• .tga
• .wps
• .xla
• .xlam
• .xlm
• .xltm
• .xltx
• .xlw
• .act
• .adp
• .al
• .bkp
• .blend
• .cdf
• .cdx
• .cgm
• .cr2
• .dac
• .dbf
• .dcr
• .ddd
• .design
• .dtd
• .fdb
• .fff
• .fpx
• .h
• .iif
• .indd
• .jpeg
• .mos
• .nd
• .nsd
• .nsf
• .nsg
• .nsh
• .odc
• .odp
• .oil
• .pas
• .pat
• .pef
• .ptx
• .qbb
• .qbm
• .sas7bdat
• .say
• .st4
• .st6
• .stc
• .sxc
• .sxw
• .tlg
• .wad
• .xlk
• .aiff
• .bin
• .bmp
• .cmt
• .dat
• .dit
• .edb
• .flvv
• .gif
• .groups
• .hdd
• .hpp
• .log
• .m2ts
• .m4p
• .mkv
• .ndf
• .nvram
• .ogg
• .ost
• .pab
• .pdb
• .pif
• .qed
• .qcow
• .qcow2
• .rvt
• .st7
• .stm
• .vbox
• .vdi
• .vhd
• .vhdx
• .vmdk
• .vmsd
• .vmx
• .vmxf
• .3fr
• .3pr
• .ab4
• .accde
• .accdt
• .ach
• .acr
• .adb
• .srw
• .st5
• .st8
• .std
• .sti
• .stw
• .stx
• .sxd
• .sxg
• .sxi
• .sxm
• .tex
• .wallet
• .wb2
• .wpd
• .x11
• .x3f
• .xis
• .ycbcra
• .qbw
• .qbx
• .qby
• .raf
• .rat
• .raw
• .rdb
• .rwl
• .rwz
• .s3db
• .sd0
• .sda
• .sdf
• .sqlite
• .sqlite3
• .sqlitedb
• .sr
• .srf
• .oth
• .otp
• .ots
• .ott
• .p12
• .p7b
• .p7c
• .pdd
• .pem
• .plus_muhd
• .plc
• .pptx
• .psafe3
• .py
• .qba
• .qbr
• .myd
• .ndd
• .nef
• .nk
• .nop
• .nrw
• .ns2
• .ns3
• .ns4
• .nwb
• .nx2
• .nxl
• .nyf
• .odb
• .odf
• .odg
• .odm
• .ord
• .otg
• .ibz
• .iiq
• .incpas
• .jpe
• .kc2
• .kdbx
• .kdc
• .kpdx
• .lua
• .mdc
• .mef
• .mfw
• .mmw
• .mny
• .moneywell
• .mrw
• .des
• .dgc
• .djvu
• .dng
• .drf
• .dxg
• .eml
• .erbsql
• .erd
• .exf
• .ffd
• .fh
• .fhd
• .gray
• .grey
• .gry
• .hbk
• .ibank
• .ibd
• .cdr4
• .cdr5
• .cdr6
• .cdrw
• .ce1
• .ce2
• .cib
• .craw
• .crw
• .csh
• .csl
• .db_journal
• .dc2
• .dcs
• .ddoc
• .ddrw
• .ads
• .agdl
• .ait
• .apj
• .asm
• .awg
• .back
• .backup
• .backupdb
• .bank
• .bay
• .bdb
• .bgt
• .bik
• .bpw
• .cdr3
• .as4
• .tif
• .asp
• .hdr

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

• .jaff

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

• {Path of encrypted File}\ReadMe.bmp
• {Path of encrypted File}\ReadMe.html
• {Path of encrypted File}\ReadMe.txt

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