RANSOM_CRYPHYDRA.M
Ransom:Win32/HydraCrypt.A (Microsoft), Ransom.CryptoMix (Malwarebytes)
Windows

Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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
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:
- %ProgramData%\FlashPlayerPlugin_{first 8 digits of ID}_{last 8 digits of ID}.exe - malware copy
- {folder of encrypted files}\# HELP_DECRYPT_YOUR_FILES #.TXT - ransom note
(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.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKCU\Software\Microsoft\
Windows\CurrentVersion\Run
FlashPlayerPlugins = "{malware path}\{malware filename}.exe"
HKCU\Software\Microsoft\
Windows\CurrentVersion\RunOnce
*FlashPlayersPlugin = "{malware path}\{malware filename}.exe"
HKCU\Software\Microsoft\
Windows\CurrentVersion\Run
FlashPlayarPlugins = "%ProgramData%\FlashPlayerPlugin_{first 8 digits of ID}_{last 8 digits of ID}.exe"
HKCU\Software\Microsoft\
Windows\CurrentVersion\RunOnce
*FleshPlayarPlugins = "%ProgramData%\FlashPlayerPlugin_{first 8 digits of ID}_{last 8 digits of ID}.exe"
Other Details
This Trojan encrypts files with the following extensions:
- .3g2
- .3gp
- .7z
- .ab4
- .ach
- .adb
- .ads
- .ait
- .al
- .apj
- .asf
- .asm
- .asp
- .asx
- .back
- .bank
- .bgt
- .bik
- .bkf
- .bkp
- .bpw
- .c
- .cdf
- .cdr
- .cdx
- .ce1
- .ce2
- .cer
- .cfp
- .class
- .cls
- .cmt
- .cpi
- .cpp
- .craw
- .crt
- .crw
- .cs
- .csh
- .csl
- .csv
- .dac
- .dbr
- .ddd
- .der
- .des
- .dgc
- .dng
- .drf
- .k2p
- .dtd
- .dxg
- .ebd
- .eml
- .exf
- .ffd
- .fff
- .fh
- .fhd
- .fla
- .flac
- .flv
- .fm
- .gray
- .grey
- .grw
- .gry
- .h
- .hpp
- .ibd
- .iif
- .indd
- .java
- .key
- .laccdb
- .lua
- .m
- .m4v
- .maf
- .mam
- .mar
- .maw
- .mdc
- .mde
- .mfw
- .mmw
- .mp4
- .mpg
- .mpp
- .mrw
- .mso
- .ndd
- .nef
- .nk2
- .nsd
- .nsg
- .nsh
- .nwb
- .nx1
- .nx2
- .odc
- .odf
- .odg
- .odp
- .ods
- .oil
- .one
- .oth
- .otp
- .ots
- .p12
- .p7b
- .p7c
- .pas
- .pat
- .pbo
- .pcd
- .pct
- .pem
- .php
- .pip
- .pl
- .plc
- .pot
- .potm
- .potx
- .ppam
- .pps
- .ppsm
- .ppsx
- .prf
- .psafe3
- .pspimage
- .pub
- .puz
- .py
- .qba
- .qbw
- .r3d
- .raf
- .rar
- .rat
- .raw
- .rm
- .rwz
- .sas7bdat
- .say
- .sd0
- .sda
- .snp
- .srf
- .srt
- .st4
- .st5
- .st6
- .st7
- .st8
- .stc
- .std
- .sti
- .stx
- .sxc
- .sxi
- .sxm
- .vob
- .vsx
- .vtx
- .wav
- .wb2
- .wll
- .wmv
- .wpd
- .x11
- .xla
- .xlam
- .xlb
- .xlc
- .xll
- .xlm
- .xlr
- .xlsb
- .xlt
- .xltm
- .xltx
- .m4a
- .wma
- .d3dbsp
- .xlw
- .xpp
- .xsn
- .yuv
- .zip
- .sie
- .unrec
- .scan
- .sum
- .t13
- .t12
- .qdf
- .tax
- .pkpass
- .bc6
- .bc7
- .sidn
- .sidd
- .mddata
- .itl
- .icxs
- .hvpl
- .hplg
- .hkdb
- .mdbackup
- .syncdb
- .gho
- .cas
- .wmo
- .itm
- .sb
- .fos
- .mov
- .vdf
- .ztmp
- .sis
- .sid
- .ncf
- .menu
- .layout
- .dmp
- .blob
- .esm
- .vcf
- .vtf
- .dazip
- .fpk
- .mlx
- .kf
- .iwd
- .vpk
- .tor
- .psk
- .rim
- .w3x
- .fsh
- .ntl
- .arch00
- .lvl
- .snx
- .cfr
- .ff
- .vpp_pc
- .lrf
- .m2
- .mcmeta
- .vfs0
- .mpqge
- .db0
- .dba
- .rofl
- .hkx
- .bar
- .upk
- .das
- .litemod
- .asset
- .forge
- .bsa
- .apk
- .re4
- .lbf
- .slm
- .epk
- .rgss3a
- .pak
- .big
- .wallet
- .wotreplay
- .xxx
- .desc
- .m3u
- .js
- .rb
- .1cd
- .dbf
- .dt
- .cf
- .cfu
- .mxl
- .epf
- .kdbx
- .vrp
- .grs
- .geo
- .st
- .pff
- .mft
- .efd
- .3dm
- .3ds
- .rib
- .ma
- .sldasm
- .sldprt
- .max
- .blend
- .lwo
- .lws
- .m3d
- .mb
- .obj
- .x
- .x3d
- .movie
- .byu
- .c4d
- .fbx
- .dgn
- .dwg
- .4db
- .4dl
- .4mp
- .abs
- .accdb
- .accdc
- .accde
- .accdr
- .accdt
- .accdw
- .accft
- .adn
- .a3d
- .adp
- .aft
- .ahd
- .alf
- .ask
- .awdb
- .azz
- .bdb
- .bnd
- .bok
- .btr
- .bak
- .backup
- .cdb
- .ckp
- .clkw
- .cma
- .daconnections
- .dacpac
- .dad
- .dadiagrams
- .daf
- .daschema
- .db
- .db-shm
- .db-wal
- .db2
- .db3
- .dbc
- .dbk
- .dbs
- .dbt
- .dbv
- .dbx
- .dcb
- .dct
- .dcx
- .ddl
- .df1
- .dmo
- .dnc
- .dp1
- .dqy
- .dsk
- .dsn
- .dta
- .dtsx
- .dxl
- .eco
- .ecx
- .edb
- .emd
- .eql
- .fcd
- .fdb
- .fic
- .fid
- .fm5
- .fmp
- .fmp12
- .fmpsl
- .fol
- .fp3
- .fp4
- .fp5
- .fp7
- .fpt
- .fzb
- .fzv
- .gdb
- .gwi
- .hdb
- .his
- .ib
- .idc
- .ihx
- .itdb
- .itw
- .jtx
- .kdb
- .lgc
- .maq
- .mdb
- .mdbhtml
- .mdf
- .mdn
- .mdt
- .mrg
- .mud
- .mwb
- .s3m
- .myd
- .ndf
- .ns2
- .ns3
- .ns4
- .nsf
- .nv2
- .nyf
- .oce
- .odb
- .oqy
- .ora
- .orx
- .owc
- .owg
- .oyx
- .p96
- .p97
- .pan
- .pdb
- .pdm
- .phm
- .pnz
- .pth
- .pwa
- .qpx
- .qry
- .qvd
- .rctd
- .rdb
- .rpd
- .rsd
- .sbf
- .sdb
- .sdf
- .spq
- .sqb
- .stp
- .sql
- .sqlite
- .sqlite3
- .sqlitedb
- .str
- .tcx
- .tdt
- .te
- .teacher
- .trm
- .udb
- .usr
- .v12
- .vdb
- .vpd
- .wdb
- .wmdb
- .xdb
- .xld
- .xlgc
- .zdb
- .zdc
- .cdr3
- .ppt
- .pptx
- .1st
- .abw
- .act
- .aim
- .ans
- .apt
- .asc
- .ascii
- .ase
- .aty
- .awp
- .awt
- .aww
- .bad
- .bbs
- .bdp
- .bdr
- .bean
- .bib
- .bna
- .boc
- .btd
- .bzabw
- .chart
- .chord
- .cnm
- .crd
- .crwl
- .cyi
- .dca
- .dgs
- .diz
- .dne
- .doc
- .docm
- .docx
- .docxml
- .docz
- .dot
- .dotm
- .dotx
- .dsv
- .dvi
- .dx
- .eio
- .eit
- .emlx
- .epp
- .err
- .etf
- .etx
- .euc
- .fadein
- .faq
- .fbl
- .fcf
- .fdf
- .fdr
- .fds
- .fdt
- .fdx
- .fdxt
- .fes
- .fft
- .flr
- .fodt
- .fountain
- .gtp
- .frt
- .fwdn
- .fxc
- .gdoc
- .gio
- .gpn
- .gthr
- .gv
- .hbk
- .hht
- .hs
- .htc
- .hwp
- .hz
- .idx
- .iil
- .ipf
- .jarvis
- .jis
- .joe
- .jp1
- .jrtf
- .kes
- .klg
- .knt
- .kon
- .kwd
- .latex
- .lbt
- .lis
- .lit
- .lnt
- .lp2
- .lrc
- .lst
- .ltr
- .ltx
- .lue
- .luf
- .lwp
- .lxfml
- .lyt
- .lyx
- .man
- .map
- .mbox
- .md5txt
- .me
- .mell
- .min
- .mnt
- .msg
- .mwp
- .nfo
- .njx
- .notes
- .now
- .nwctxt
- .nzb
- .ocr
- .odm
- .odo
- .odt
- .ofl
- .oft
- .openbsd
- .ort
- .ott
- .p7s
- .pages
- .pfs
- .pfx
- .pjt
- .plantuml
- .prt
- .psw
- .pu
- .pvj
- .pvm
- .pwi
- .pwr
- .qdl
- .rad
- .readme
- .rft
- .ris
- .rng
- .rpt
- .rst
- .rt
- .rtd
- .rtf
- .rtx
- .run
- .rzk
- .rzn
- .saf
- .safetext
- .sam
- .scc
- .scm
- .scriv
- .scrivx
- .scw
- .sdm
- .sdoc
- .sdw
- .sgm
- .sig
- .skcard
- .sla
- .slagz
- .sls
- .smf
- .sms
- .ssa
- .strings
- .stw
- .sty
- .sub
- .sxg
- .sxw
- .tab
- .tdf
- .text
- .thp
- .tlb
- .tm
- .tmd
- .tmv
- .tmx
- .tpc
- .trelby
- .tvj
- .txt
- .u3d
- .u3i
- .unauth
- .unx
- .uof
- .uot
- .upd
- .utf8
- .unity
- .utxt
- .vct
- .vnt
- .vw
- .wbk
- .wcf
- .webdoc
- .wgz
- .wn
- .wp
- .wp4
- .wp5
- .wp6
- .wp7
- .wpa
- .wpl
- .wps
- .wpt
- .wpw
- .wri
- .wsc
- .wsd
- .wsh
- .wtx
- .xbdoc
- .xbplate
- .xdl
- .xlf
- .xps
- .xwp
- .xy3
- .xyp
- .xyw
- .ybk
- .yml
- .zabw
- .zw
- .2bp
- .0
- .36
- .3fr
- .411
- .73i
- .8xi
- .9png
- .abm
- .afx
- .agif
- .agp
- .aic
- .albm
- .apd
- .apm
- .aps
- .apx
- .artwork
- .arw
- .asw
- .avatar
- .bay
- .blkrt
- .bm2
- .bmp
- .bmx
- .bmz
- .brk
- .brn
- .brt
- .bss
- .bti
- .c4
- .cal
- .cals
- .can
- .cd5
- .cdc
- .cdg
- .cimg
- .cin
- .cit
- .colz
- .cpc
- .cpd
- .cpg
- .cps
- .cpx
- .cr2
- .ct
- .dc2
- .dcr
- .dds
- .dgt
- .dib
- .djv
- .dm3
- .dmi
- .vue
- .dpx
- .wire
- .drz
- .dt2
- .dtw
- .dvl
- .ecw
- .eip
- .erf
- .exr
- .fal
- .fax
- .fil
- .fpos
- .g3
- .gcdp
- .gfb
- .gfie
- .ggr
- .gif
- .gih
- .gim
- .gmbck
- .gmspr
- .spr
- .scad
- .gpd
- .gro
- .grob
- .hdr
- .hpi
- .i3d
- .icn
- .icpr
- .iiq
- .info
- .int
- .ipx
- .itc2
- .iwi
- .j
- .j2c
- .j2k
- .jas
- .jb2
- .jbig
- .jbig2
- .jbmp
- .jbr
- .jfif
- .jia
- .jng
- .jpg2
- .jps
- .jpx
- .jtf
- .jwl
- .jxr
- .kdc
- .kdi
- .kdk
- .kic
- .kpg
- .lbm
- .ljp
- .mac
- .mbm
- .mef
- .mnr
- .mos
- .mpf
- .mpo
- .mrxs
- .myl
- .ncr
- .nct
- .nlm
- .nrw
- .oc3
- .oc4
- .oc5
- .oci
- .omf
- .oplc
- .af2
- .af3
- .ai
- .art
- .asy
- .cdmm
- .cdmt
- .cdmtz
- .cdmz
- .cdt
- .cgm
- .cmx
- .cnv
- .csy
- .cv5
- .cvg
- .cvi
- .cvs
- .cvx
- .cwt
- .cxf
- .dcs
- .ded
- .design
- .dhs
- .dpp
- .drw
- .dxb
- .dxf
- .egc
- .ep
- .eps
- .epsf
- .fh10
- .fh11
- .fh3
- .fh4
- .fh5
- .fh6
- .fh7
- .fh8
- .fif
- .fig
- .fmv
- .ft10
- .ft11
- .ft7
- .ft8
- .ft9
- .ftn
- .fxg
- .gdraw
- .gem
- .glox
- .gsd
- .hpg
- .hpgl
- .hpl
- .idea
- .igt
- .igx
- .imd
- .ink
- .lmk
- .mgcb
- .mgmf
- .mgmt
- .mt9
- .mgmx
- .mgtx
- .mmat
- .mat
- .otg
- .ovp
- .ovr
- .pcs
- .pfd
- .pfv
- .pl
- .plt
- .vrml
- .pobj
- .psid
- .rdl
- .scv
- .sk1
- .sk2
- .slddrt
- .snagitstamps
- .snagstyles
- .ssk
- .stn
- .svf
- .svgz
- .sxd
- .tlc
- .tne
- .ufr
- .vbr
- .vec
- .vml
- .vsd
- .vsdm
- .vsdx
- .vstm
- .stm
- .vstx
- .wpg
- .vsm
- .vault
- .xar
- .xmind
- .xmmap
- .yal
- .orf
- .ota
- .oti
- .ozb
- .ozj
- .ozt
- .pal
- .pano
- .pap
- .pbm
- .pc1
- .pc2
- .pc3
- .pcd
- .pdd
- .pe4
- .pef
- .pfi
- .pgf
- .pgm
- .pi1
- .pi2
- .pi3
- .pic
- .pict
- .pix
- .pjpeg
- .pjpg
- .pm
- .pmg
- .pni
- .pnm
- .pntg
- .pop
- .pp4
- .pp5
- .ppm
- .prw
- .psdx
- .pse
- .psp
- .pspbrush
- .ptg
- .ptx
- .pvr
- .px
- .pxr
- .pz3
- .pza
- .pzp
- .pzs
- .z3d
- .qmg
- .ras
- .rcu
- .rgb
- .rgf
- .ric
- .riff
- .rix
- .rle
- .rli
- .rpf
- .rri
- .rs
- .rsb
- .rsr
- .rw2
- .rwl
- .s2mv
- .sai
- .sci
- .sct
- .sep
- .sfc
- .sfera
- .sfw
- .skm
- .sld
- .sob
- .spa
- .spe
- .sph
- .spj
- .spp
- .sr2
- .srw
- .ste
- .sumo
- .sva
- .save
- .ssfn
- .t2b
- .tb0
- .tbn
- .tex
- .tfc
- .tg4
- .thm
- .thumb
- .tjp
- .tm2
- .tn
- .tpi
- .ufo
- .uga
- .usertile-ms
- .vda
- .vff
- .vpe
- .vst
- .wb1
- .wbc
- .wbd
- .wbm
- .wbmp
- .wbz
- .wdp
- .webp
- .wpb
- .wpe
- .wvl
- .x3f
- .y
- .ysp
- .zif
- .cdr4
- .cdr6
- .cdrw
- .jpeg
- .djvu
- .ddoc
- .css
- .pptm
- .raw
- .cpt
- .jpg
- .jpe
- .jp2
- .pcx
- .pdn
- .png
- .psd
- .tga
- .tiff
- .tif
- .hdp
- .xpm
- .ai
- .ps
- .wmf
- .emf
- .ani
- .apng
- .flc
- .fb2
- .fb3
- .fli
- .mng
- .smil
- .svg
- .mobi
- .swf
- .html
- .xls
- .xlsx
- .xlsm
- .xhtm
- .mrwref
- .xf
- .pst
- .bd
- .tar
- .gz
- .mkv
- .xml
- .xmlx
- .dat
- .mcl
- .mte
- .cfg
- .mp3
- .qbi
- .qbr
- .cnt
- .v30
- .qbo
- .lgb
- .qwc
- .qbp
- .aif
- .qby
- .1pa
- .qpd
- .set
- .nd
- .rtp
- .qbwin
- .log
- .qbbackup
- .tmp
- .temp1234
- .qbt
- .qbsdk
- .syncmanagerlogger
- .ecml
- .qsm
- .qss
- .qst
- .fx0
- .fx1
- .mx0
- .fpx
- .fxr
- .fim
It renames encrypted files using the following names:
- {file name}.{file extension}.id_{ID}_email_enc10@dr.com_.rmd
It does the following:
- It deletes shadow copies using the following commands:
- /C vssadmin Delete Shadows /All /Quiet
- /C wmic shadowcopy delete
- /C vssadmin Delete Shadows /For={Drive Letter Z-A} /All /Quiet
- It disables Volume Shadow Service using the following command:
- net stop vss
- It disables Startup Repair from running using the following command:
- /bcedit /set {default} recoveryenabled No
- It deletes the backup catalog using the following command:
- wbadmin delete catalog -quiet
- It disables or turns off Windows Error Recovery Screen on Startup using the following command:
- /bcdedit /set bootstatuspolicy ignoreallfailures
It performs DNS requests to the following sites:
- {BLOCKED}.{BLOCKED}.177.38
NOTES:
This ransomware displays the following ransom note:
SOLUTION
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\Run
- FlashPlayerPlugins = "{malware path}\{malware filename}.exe"
- FlashPlayerPlugins = "{malware path}\{malware filename}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- *FlashPlayersPlugin = "{malware path}\{malware filename}.exe"
- *FlashPlayersPlugin = "{malware path}\{malware filename}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- FlashPlayarPlugins = "%ProgramData%\FlashPlayerPlugin_{first 8 digits of ID}_{last 8 digits of ID}.exe"
- FlashPlayarPlugins = "%ProgramData%\FlashPlayerPlugin_{first 8 digits of ID}_{last 8 digits of ID}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- *FleshPlayarPlugins = "%ProgramData%\FlashPlayerPlugin_{first 8 digits of ID}_{last 8 digits of ID}.exe"
- *FleshPlayarPlugins = "%ProgramData%\FlashPlayerPlugin_{first 8 digits of ID}_{last 8 digits of ID}.exe"
Step 4
Search and delete this file
- {folder of encrypted files}\# HELP_DECRYPT_YOUR_FILES #.TXT
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_CRYPHYDRA.M. 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.
NOTES:
Enable services disabled using the command prompt.
Run cmd.exe as administrator.
To enable Volume Shadow Service use the following command: net start vss
To enable Windows Error Recovery Screen on Startup use the following command: bcdedit /set {default} bootstatuspolicy displayallfailures
To enable Startup Repair use the following command: /bcedit /set {default} recoveryenabled Yes
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