RANSOM_EXMAS.E
a variant of Win32/Filecoder.Xmas.A (ESET-NOD32); W32/Filecoder_Xmas.A!tr (Fortinet);
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Via email
This malware, name derived from the title of its ransom note, was discovered early January 2017. Victims of this ransomware will have their files encrypted, with a ransom note wishing them a Merry Christmas and demanding to pay the ransom in order to retrieve the encrypted files.
To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
259,980 bytes
EXE
No
04 Jan 2017
Encrypts files, Drops files
Arrival Details
This Trojan 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 Trojan drops the following files:
- %Desktop%\YOUR_FILES_ARE_DEAD.HTA - ransom note
- {folders containing encrypted files}\YOUR_FILES_ARE_DEAD.HTA - ransom note
(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop 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.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKCU\Software\Microsoft\
Windows\CurrentVersion\RunOnce
Adobe = {Malware Path}\{Malware Name}.exe
Other System Modifications
This Trojan modifies the following file(s):
- It encrypts files and appends the extension .RARE1
Other Details
This Trojan encrypts files with the following extensions:
- 001
- 1cd
- 3d
- 3d4
- 3df8
- 3dm
- 3ds
- 3fr
- 3g2
- 3ga
- 3gp
- 3gp2
- 3mm
- 3pr
- 7z
- 7zip
- 8ba
- 8bc
- 8be
- 8bf
- 8bi8
- 8bl
- 8bs
- 8bx
- 8by
- 8li
- a2c
- aa
- aa3
- aac
- aaf
- ab4
- abk
- abw
- ac2
- ac3
- accdb
- accde
- accdr
- accdt
- ace
- ach
- acr
- act
- adb
- ade
- adi
- adp
- adpb
- adr
- ads
- adt
- aep
- aepx
- aes
- aet
- afp
- agd1
- agdl
- ai
- aif
- aiff
- aim
- aip
- ais
- ait
- ak
- al
- allet
- alphacrypt
- amf
- amr
- amu
- amx
- amxx
- ans
- aoi
- ap
- ape
- api
- apj
- apk
- apnx
- app
- arc
- arch00
- ari
- arj
- aro
- arr
- arw
- as
- as3
- asa
- asc
- ascx
- ase
- asf
- ashx
- asm
- asmx
- asp
- aspx
- asr
- asset
- asx
- automaticdestinations-ms
- avi
- avs
- awg
- azf
- azs
- azw
- azw1
- azw3
- azw4
- b2a
- back
- backup
- backupdb
- bad
- bak
- bank
- bar
- bat
- bay
- bc6
- bc7
- bck
- bcp
- bdb
- bdp
- bdr
- bfa
- bgt
- bi8
- bib
- bic
- big
- bik
- bin
- bkf
- bkp
- bkup
- blend
- blob
- blp
- bmc
- bmf
- bml
- bmp
- boc
- bp2
- bp3
- bpk
- bpl
- bpw
- brd
- bsa
- bsk
- bsp
- btoa
- bvd
- bz2
- c
- cag
- cam
- camproj
- cap
- car
- cas
- cat
- cbf
- cbr
- cbz
- cc
- ccd
- ccf
- cch
- cd
- cdf
- cdi
- cdr
- cdr3
- cdr4
- cdr5
- cdr6
- cdrw
- cdx
- ce1
- ce2
- cef
- cer
- cert
- cfg
- cfm
- cfp
- cfr
- cgf
- cgi
- cgm
- cgp
- chk
- chml
- cib
- class
- clr
- cls
- clx
- cmd
- cmf
- cms
- cmt
- cnf
- cng
- cod
- col
- con
- conf
- config
- contact
- cp
- cpi
- cpio
- cpp
- cr2
- craw
- crd
- crt
- crw
- crwl
- crypt
- crypted
- cryptra
- cryptXXX
- cs
- csh
- csi
- csl
- cso
- csr
- css
- csv
- ctt
- cty
- cue
- cwf
- d3dbsp
- dac
- dal
- dap
- das
- dash
- dat
- database
- dayzprofile
- dazip
- db
- db_journal
- db0
- db3
- dba
- dbb
- dbf
- dbfv
- db-journal
- dbx
- dc2
- dc4
- dch
- dco
- dcp
- dcr
- dcs
- dcu
- ddc
- ddcx
- ddd
- ddoc
- ddrw
- dds
- default
- dem
- der
- des
- desc
- design
- desklink
- dev
- dex
- dfm
- dgc
- dic
- dif
- dii
- dim
- dime
- dip
- dir
- directory
- disc
- disk
- dit
- divx
- diz
- djv
- djvu
- dlc
- dmg
- dmp
- dng
- dob
- doc
- docb
- docm
- docx
- dot
- dotm
- dotx
- dox
- dpk
- dpl
- dpr
- drf
- drw
- dsk
- dsp
- dtd
- dvd
- dvi
- dvx
- dwg
- dxb
- dxe
- dxf
- dxg
- e4a
- edb
- efl
- efr
- efu
- efx
- eip
- elf
- emc
- emf
- eml
- enc
- enx
- epk
- eps
- epub
- eql
- erbsql
- erf
- err
- esf
- esm
- euc
- evo
- ex
- exf
- exif
- f90
- faq
- fcd
- fdb
- fdr
- fds
- ff
- ffd
- fff
- fh
- fhd
- fla
- flac
- flf
- flp
- flv
- flvv
- for
- forge
- fos
- fpenc
- fpk
- fpp
- fpx
- frm
- fsh
- fss
- fxg
- gadget
- gam
- gbk
- gbr
- gdb
- ged
- gfe
- gfx
- gho
- gif
- gif,.bmp
- gpg
- gpx
- gray
- grey
- grf
- groups
- gry
- gthr
- gxk
- gz
- gzig
- gzip
- h
- h3m
- h4r
- hbk
- hbx
- hdd
- hex
- hkdb
- hkx
- hplg
- hpp
- hqx
- htm
- html
- htpasswd
- hvpl
- hwp
- ibank
- ibd
- ibooks
- ibz
- ico
- icxs
- idl
- idml
- idx
- ie5
- ie6
- ie7
- ie8
- ie9
- iff
- iif
- iiq
- img
- incpas
- indb
- indd
- indl
- indt
- ink
- inx
- ipa
- iso
- isu
- isz
- itdb
- itl
- itm
- iwd
- iwi
- jac
- jar
- jav
- java
- jbc
- jc
- jfif
- jge
- jgz
- jif
- jiff
- jks
- jnt
- jpc
- jpe
- jpeg
- jpf
- jpg
- jpw
- js
- json
- jsp
- just
- k25
- kc2
- kdb
- kdbx
- kdc
- kde
- key
- kf
- klq
- kml
- kmz
- kpdx
- kwd
- kwm
- laccdb
- lastlogin
- lay
- lay6
- layout
- lbf
- lbi
- lcd
- lcf
- lcn
- ldb
- ldf
- lgp
- lib
- lit
- litemod
- lngttarch2
- localstorage
- locky
- log
- lp2
- lpa
- lrf
- ltm
- ltr
- ltx
- lua
- lvivt
- lvl
- m
- m2
- m2ts
- m3u
- m3u8
- m4a
- m4p
- m4u
- m4v
- mag
- man
- map
- mapimail
- max
- mbox
- mbx
- mcd
- mcgame
- mcmeta
- mcrp
- md
- md0
- md1
- md2
- md3
- md5
- mdb
- mdbackup
- mdc
- mddata
- mdf
- mdl
- mdn
- mds
- mef
- menu
- meo
- mfd
- mfw
- mic
- mid
- mim
- mime
- mip
- mjd
- mkv
- mlb
- mlx
- mm6
- mm7
- mm8
- mme
- mml
- mmw
- mny
- mobi
- mod
- moneywell
- mos
- mov
- movie
- moz
- mp1
- mp2
- mp3
- mp4
- mp4v
- mpa
- mpe
- mpeg
- mpg
- mpq
- mpqge
- mpv2
- mrw
- mrwref
- ms11
- ms11(Securitycopy)
- mse
- msg
- msi
- msp
- mts
- mui
- mxp
- myd
- myi
- nav
- ncd
- ncf
- nd
- ndd
- ndf
- nds
- nef
- nfo
- nk2
- nop
- note
- now
- nrg
- nri
- nrw
- ns2
- ns3
- ns4
- nsd
- nsf
- nsg
- nsh
- ntl
- number
- nvram
- nwb
- nx1
- nx2
- nxl
- nyf
- oab
- obj
- odb
- odc
- odf
- odg
- odi
- odm
- odp
- ods
- odt
- oft
- oga
- ogg
- oil
- opd
- opf
- orf
- ost
- otg
- oth
- otp
- ots
- ott
- owl
- oxt
- p12
- p7b
- p7c
- pab
- pack
- pages
- pak
- paq
- pas
- pat
- pbf
- pbk
- pbp
- pbs
- pcd
- pct
- pcv
- pdb
- pdc
- pdd
- pef
- pem
- pfx
- php
- pif
- pkb
- pkey
- pkh
- pkpass
- pl
- plb
- plc
- pli
- plugin
- plus_muhd
- pm
- pmd
- png
- po
- pot
- potm
- potx
- ppam
- ppd
- ppf
- ppj
- pps
- ppsm
- ppsx
- ppt
- pptm
- pptx
- prc
- prel
- prf
- priv
- privat
- props
- prproj
- prt
- ps
- psa
- psafe3
- psd
- psk
- pspimage
- pst
- psw6
- ptx
- pub
- puz
- pwf
- pwi
- pwm
- pxp
- py
- qba
- qbb
- qbm
- qbr
- qbw
- qbx
- qby
- qcow
- qcow2
- qdf
- qed
- qel
- qic
- qif
- qpx
- qt
- qtq
- qtr
- r00
- r01
- r02
- r03
- r3d
- ra
- ra2
- raf
- ram
- rar
- rat
- raw
- rb
- rdb
- rdi
- re4
- res
- result
- rev
- rgn
- rgss3a
- rim
- rll
- rm
- rng
- rofl
- rpf
- rrt
- rsdf
- rsrc
- rss
- rsw
- rte
- rtf
- rts
- rtx
- rum
- run
- rv
- rvt
- rw2
- rwl
- rwz
- rzk
- rzx
- s3db
- sad
- saf
- safe
- sas7bdat
- sav
- save
- say
- sb
- sc2save
- sch
- scm
- scn
- scx
- sd0
- sd1
- sda
- sdb
- sdc
- sdf
- sdn
- sdo
- sds
- sdt
- search-ms
- sef
- sen
- ses
- sfs
- sfx
- sgz
- sh
- shar
- shr
- shw
- shy
- sid
- sidd
- sidn
- sie
- sis
- sitx
- sldm
- sldx
- slk
- slm
- sln
- slt
- sme
- snk
- snp
- snx
- so
- spd
- spr
- sql
- sqlite
- sqlite3
- sqlitedb
- sqllite
- sqx
- sr2
- srf
- srt
- srw
- ssa
- st4
- st5
- st6
- st7
- st8
- stc
- std
- sti
- stm
- stt
- stw
- stx
- sud
- suf
- sum
- svg
- svi
- svr
- swd
- swf
- switch
- sxc
- sxd
- sxg
- sxi
- sxm
- sxw
- syncdb
- t01
- t03
- t05
- t12
- t13
- tar
- tar.bz2
- tarbz2
- tax
- tax2013
- tax2014
- tbk
- tbz2
- tch
- tcx
- teslacrypt
- tex
- text
- tg
- tga
- tgz
- thm
- thmx
- tif
- tiff
- tlb
- tlg
- tlz
- tmp
- toast
- tor
- torrent
- tpu
- tpx
- trp
- ts
- tu
- tur
- txd
- txf
- txt
- uax
- udf
- uea
- umx
- unity3d
- unr
- unx
- uop
- uot
- upk
- upoi
- url
- usa
- usx
- ut2
- ut3
- utc
- utx
- uu
- uud
- uue
- uvx
- uxx
- val
- vault
- vb
- vbox
- vbs
- vc
- vcd
- vcf
- vcxpro
- vdf
- vdi
- vdo
- ver
- vfs0
- vhd
- vhdx
- vlc
- vlt
- vmdk
- vmf
- vmsd
- vmt
- vmx
- vmxf
- vob
- vp
- vpk
- vpp_pc
- vsi
- vtf
- w3g
- w3x
- wab
- wad
- wallet
- war
- wav
- wave
- waw
- wb2
- wbk
- wdgt
- wks
- wm
- wma
- wmd
- wmdb
- wmmp
- wmo
- wmv
- wmx
- wotreplay
- wow
- wpd
- wpe
- wpk
- wpl
- wps
- wsf
- wsh
- wtd
- wtf
- wvx
- x11
- x3f
- xcodeproj
- xf
- xhtml
- xis
- xl
- xla
- xlam
- xlc
- xlk
- xll
- xlm
- xlr
- xls
- xlsb
- xlsm
- xlsx
- xlt
- xltm
- xltx
- xlv
- xlw
- xlwx
- xml
- xpi
- xps
- xpt
- xqx
- xsl
- xtbl
- xvid
- xwd
- xxe
- xxx
- yab
- ycbcra
- yenc
- yml
- ync
- yps
- yuv
- z02
- z04
- zap
- zip
- zipx
- zoo
- zps
- ztmp
NOTES:
This ransomware displays message box once the encryption is finished.
It also shows the ransomnote YOUR_FILES_ARE_DEAD.HTA:
SOLUTION
9.800
13.146.05
04 Jan 2017
13.147.00
05 Jan 2017
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- Adobe = {Malware Path}\{Malware Name}.exe
- Adobe = {Malware Path}\{Malware Name}.exe
Step 4
Search and delete this file
- %Desktop%\YOUR_FILES_ARE_DEAD.HTA
- {folders containing encrypted files}\YOUR_FILES_ARE_DEAD.HTA
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_EXMAS.E. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Step 6
Restore encrypted files from backup.
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