RANSOM_CRYPJAFF.ENI

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:

• %ProgramData%\Rondo\backup.om

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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 = %ProgramData%\Rondo\WallpapeR.bmp

(Note: The default value data of the said registry entry is {user preference}.)

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

Other Details

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

• http://{BLOCKED}sstafastoriesticks.info/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
• .iso

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

• .wlu

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

• %ProgramData%\Rondo\WallpapeR.bmp
• {Encrypted file directory}\README_TO_DECRYPTI.bmp
• {Encrypted file directory}\README_TO_DECRYPTI.txt
• {Encrypted file directory}\README_TO_DECRYPTI.html

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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 text:

NOTES:
The content of the dropped html as ransom note are shown in the image below: