RANSOM_DXXD.A
Win32/Filecoder.DXXD.A (ESET-NOD32)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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.
It deletes itself after execution.
TECHNICAL DETAILS
11,776 bytes
EXE
No
11 Oct 2016
encrypts 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:
- {Path of Encrypted Files}/ReadMe.TxT <-- Ransom Note
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
LegalNoticeCaption = Microsoft Windows Security Center. Dear Administrator, Your server hacked. For more informations and recommendations, write to our experts by e-mail: rep_stosd@protonmail.com or rep_stosd@tuta.io.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
LegalNoticeText = When you start Windows, WindowsDefender works to help protect your PC by scanning for malicious or unwanted software.
Other Details
This Trojan encrypts files with the following extensions:
- .dbf
- .pll
- .ntx
- .ovl
- .prn
- .chm
- .bmp
- .ini
- .axp
- .prnbtw
- .pp
- .log
- .jpg
- .jpeg
- .tif
- .man
- .gz
- .sln
- .vhd
- .dl_
- .DSC
- .rdj
- .irj
- .miz
- .psz
- .rcf
- .ssms
- .xsl
- .inx
- .isn
- .QBB
- .fll
- .lyt
- .pptx
- .ibenc
- .dbc
- .dcx
- .dct
- .cdx
- .psd
- .bup
- .vbs
- .htm
- .compiled
- .zip
- .nup
- .sql
- .zidan
- .udl
- .mof
- .plk
- .mdf
- .ldf
- .bin
- .crt
- .p7b
- .xml
- .exp
- .1of2
- .2of2
- .slf
- .bak
- .rar
- .aspx
- .master
- .gif
- .asax
- .iso
- .config
- .cshtml
- .rpt
- .manifest
- .cmd
- .torrent
- .uicfg
- .xsd
- .cat
- .asm
- .vmp
- .trc
- .1
- .2
- .3
- .4
- .5
- .6
- .7
- .8
- .9
- .10
- .out
- .lex
- .h
- .db
- .dat
- .json
- .cache
- .pset
- .sbstore
- .accdb
- .pnt
- .dwg
- .err
- .7z
- .mpeg
- .shs
- .cfg
- .a
- .job
- .csd
- .esd
- .ggf
- .xnl
- .sty
- .dst
- .mp3
- .pol
- .timg
- .wav
- .wpl
- .dia
- .016
- .bnk
- .pst
- .htz
- .isu
- .jobx
- .oxps
- .cgd
- .TSF
- .900
- .oca
- .OCX
- .doccount
- .wim
- .fdl
- .deploy
- .ndf
- .pyd
- .py
- .pyc
- .doc
- .docx
- .dot
- .xls
- .xlsx
- .ppt
- .one
- .pub
- .vsdx
- .mdb
- .mso
- .xlsb
- .oft
- .asd
- .mpp
- .xlsm
- .reg
- .edb
- .ci
- .dir
- .wid
- .png
- .plist
- .tiff
- .msg
- .001
- .mp4
- .csv
- .txt
- .res
- .jar
- .js
- .bat
- .c
- .cpp
- .cs
- .ps1
- .set
- .wad
- .html
- .php
- .css
- .cer
- .eps
- .pfx
- .mst
- .lst
- .odt
- .accdt
- .crypt
- .eng
- .fdb
- .fits
- .flat
- .flf
- .flm
- .flt
- .flx
- .fm
- .fm3
- .fm5
- .fmb
- .fmd
- .fmdb
- .fmedb
- .fml
- .fmo
- .fmp
- .fmp12
- .fmp3
- .fmplugin
- .fmpr
- .fmpsl
- .fmpur
- .fmt
- .fmtr
- .fmx
- .fnd
- .fo
- .foc
- .fog
- .fol
- .fow
- .fox
- .fp
- .fp3
- .fp4
- .fp5
- .fp6
- .fp7
- .fpk
- .fpm
- .fpsl
- .fpt
- .fpw
- .fragment
- .frg
- .frm
- .fro
- .frx
- .fsf
- .fsl
- .ftch
- .ftr
- .fts
- .ftx
- .fw
- .fw2
- .fw3
- .fxp
- .fxr
- .g
- .g3d
- .g4
- .gab
- .gar
- .gb
- .gbk
- .gdb
- .gdbindexes
- .gdbtable
- .gdbtablx
- .gdc
- .gde
- .gdl
- .gdq
- .gen
- .geo
- .gfm
- .gjd
- .gpk
- .gpr
- .gpx
- .grdb
- .gsdu
- .gtable
- .gtr
- .gwf
- .h!
- .hbc
- .hbc2
- .hbe
- .hbin
- .hbk
- .hdb
- .hdf
- .hdr
- .hdv
- .hdx
- .hhm
- .hhs
- .hia
- .hip
- .his
- .hjt
- .hkdb
- .hkp
- .hlp
- .hlt
- .hmm
- .hnd
- .htmhjt
- .htri
- .htx
- .i
- .i5z
- .iab
- .ib
- .ibd
- .ibs
- .ibz
- .icbu
- .icd
- .icg
- .icms
- .icp
- .idb
- .idb2
- .idc
- .idm
- .idq
- .idt
- .iff
- .iflv
- .ifp
- .ihtml
- .ihx
- .imd
- .imgcache
- .imp
- .imr
- .in4
- .ind
- .inp
- .ins
- .ipdb
- .iqd
- .iqy
- .irg
- .irn
- .is1
- .is2
- .is4
- .isam
- .isi
- .ispac
- .isx
- .itdb
- .itl
- .itld
- .itw
- .ivt
- .iw
- .iwc
- .ix2
- .blt
- .hta
- .xtlb
- .globe
- .rpmsg
- .thmx
- .snp
- .obi
- .ost
- .olm
- .xsn
- .vsd
- .laccdb
- .dotx
- .docm
- .accdr
- .xlam
- .mde
- .wbk
- .onepkg
- .pptm
- .xltx
- .pip
- .xla
- .accde
- .ppsm
- .ppsx
- .vss
- .slk
- .crtx
- .xlt
- .svd
- .xlb
- .xlw
- .grv
- .xlm
- .potx
- .xar
- .iaf
- .mpd
- .pa
- .pps
- .ops
- .dotm
- .pot
- .oab
- .acl
- .mdt
- .mpt
- .xltm
- .xl
- .ade
- .vst
- .ppam
- .xsf
- .mda
- .accdc
- .mdw
- .xll
- .mat
- .sldx
- .vdx
- .mar
- .ppa
- .accda
- .maf
- .puz
- .vsx
- .mam
- .potm
- .prf
- .wll
- .xlc
- .vtx
- .accdp
- .sldm
- .accdu
- .maq
- .xslb
- .h1q
- .cnv
- .maw
- .ova
- .vmdk
- .conf
- .vmem
- .vdi
- .vbox-extpack
- .vhdx
- .vmx
- .nvram
- .ovf
- .pvm
- .vmc
- .pvs
- .vmxf
- .vmsg
- .hdd
- .vmwarevm
- .vbox
- .hds
- .appicon
- .vfd
- .xva
- .qcow2
- .vcb
- .vmsd
- .efd
- .fdd
- .vmcx
- .xml-prev
- .menudata
- .avhd
- .vmsn
- .vswp
- .vmss
- .r0
- .vsv
- .zrp
- .dsk
- .hlog
- .qcow
- .appdata
- .psf
- .xvm
- .mem
- .img
- .vmoapp
- .qvm
- .vud
- .vmt
- .vcf
- .eml
- .msf
- .mht
- .vcard
- .dbx
- .mbox
- .emix
- .ldif
- .emlx
- .rcv
- .mab
- .nws
- .oas
- .mbs
- .list
- .gwi
- .pab
- .mlm
- .mbx
- .sbd
- .wdseml
- .abx
- .pbx
- .ezm
- .pmm
- .p10
- .boe
- .tbb
- .pmi
- .box
- .agt
- .msb
- .ldi
- .tnf
- .mhp
- .bri
- .mau
- .cnm
- .mailhost
- .pmx
- .maildb
- .pop
- .pm1
- .mbg
- .smd
- .mozeml
- .mmdf
- .outlook97
- .gmp
- .smp
- .pml
- .schd
- .pmc
- .asv
- .vrge08note
- .pm3
- .bina
- .bdf
- .pki
- .vmtm
- .vmdk-converttmp
- .kbd
- .pvi
- .vmlog
- .vmpl
- .std
- .pvc
- .vpc7
- .vmba
- .vpc6
- .vmxa
- .vmhf
- .vmac
- .vmhr
- .syndarticle
- .ix3
- .ixf
- .ixl
- .ixr
- .j
- .j2c
- .j2k
- .jds
- .jdx
- .jet
- .jfif
- .jnl
- .joml
- .jor
- .jrs
- .jst
- .jw
- .jz
- .k01
- .idx
- .inc
- .ipd
- .lng
- .msi
- .prg
- .sdf
- .sqlite
- .tbl
- .upd
- .wdb
- .wps
- .$$f
- .$db
- .$er
- .000
- .0000000001
- .1pif
- .3db
- .3gpp2
- .4db
- .4dd
- .4dl
- .4dr
- .4ds
- .4lb
- .4lk
- .4mp
- .4ug
- .4vr
- .5d
- .9xd
- .a2s
- .aaa
- .abbu
- .abcddb
- .abcdmr
- .abf
- .abm
- .abs
- .acad
- .accdw
- .accfl
- .accft
- .acf
- .acm
- .acp
- .acq
- .adb
- .adblock
- .add
- .adi
- .adm
- .adn
- .adp
- .adr
- .cod
- .con
- .cpd
- .cpf
- .cpt
- .cqs
- .crb
- .crd
- .crds
- .crf
- .crp
- .crypt10
- .crypt11
- .crypt12
- .crypt5
- .crypt6
- .crypt7
- .crypt8
- .crypt9
- .csh
- .csp
- .ctf
- .cti
- .ctl
- .cub
- .current
- .cvb
- .cvd
- .cvt
- .cwdb
- .cwt
- .d1
- .d2
- .dab
- .dacpac
- .daf
- .dap
- .daschema
- .data
- .database
- .db$
- .db-exception
- .db-journal
- .db-shm
- .db-wal
- .db
- .crypt5
- .db
- .crypt7
- .db
- .crypt8
- .db0
- .db1
- .db2
- .db2p
- .db3
- .db3-journal
- .db4
- .db5
- .db6
- .db7
- .db8
- .dbg
- .dbi
- .dbk
- .dblib
- .dblink
- .dbmanifest
- .dbmdl
- .dbml
- .dbo
- .mdl
- .dbp
- .dbpf
- .dbproj
- .dbq
- .dbr
- .dbs
- .dbschema
- .dbsdif
- .dbt
- .dbu
- .dbv
- .dbw
- .dbz
- .dcb
- .dcd
- .dcf
- .dcfg
- .dcm
- .dcmd
- .dd
- .ddb
- .ddf
- .ddl
- .ddm
- .ddr
- .dec
- .ded
- .def
- .dev
- .dez
- .df
- .df1
- .df2
- .df3
- .df4
- .df6
- .df7
- .dff
- .dfq
- .dfr
- .dft
- .dg
- .dgb
- .dgdat
- .dgr
- .dii
- .dis
- .dit
- .dlc
- .dls
- .dm
- .dm1
- .dmd
- .dmg
- .dml
- .dmo
- .dmpx
- .dmu
- .dmy
- .dna
- .dnb
- .dnc
- .dnl
- .dock
- .dp1
- .dpb
- .dpl
- .dql
- .dqy
- .dr2
- .drg
- .dri
- .ds
- .dsc
- .dsd
- .dsdb
- .dsn
- .dso
- .dss
- .dsv
- .dta
- .dtf
- .dtm
- .dts
- .duo
- .dwl
- .dxi
- .ec3
- .ecb
- .ecfg
- .eco
- .ecsv
- .ecx
- .ede
- .edmx
- .edq
- .edt
- .edv
- .edx
- .efxt
- .eit
- .emd
- .emsg
- .enb
- .enc
- .encrypted
- .enl
- .enlx
- .enq
- .epd
- .epj
- .epl
- .eqd
- .eql
- .erd
- .erf
- .esb
- .esr
- .evcd
- .event
- .evn
- .exb
- .exc
- .exh
- .exx
- .f
- .f+db
- .f2b
- .fa
- .fad
- .fasta
- .fbd
- .fbm
- .fcd
- .fcfe
- .fcs
- .fct
- .fd
- .fd1
- .fds
- .ffd
- .ffs
- .ffs_db
- .fgr
- .fic
- .fid
- .fil
- .fit
- .db9
- .dba
- .dbag
- .dbb
- .dbd
- .dbdif
- .adrg
- .adt
- .adx
- .ae1
- .aet
- .aex
- .afl
- .afo
- .afz
- .agp
- .ags
- .ai
- .aij
- .al
- .alb
- .all
- .alm
- .aln
- .alw
- .alx
- .am
- .amb
- .amc
- .amiglobe
- .amj
- .amm
- .ap
- .apdb
- .apfacename
- .aph
- .aplibrary
- .app
- .apv
- .apvault
- .apx
- .aqc
- .arm
- .arz
- .as
- .asa
- .asdatabase
- .asdb
- .asi
- .ask
- .asr
- .assoc
- .ate
- .ati
- .atn
- .atr
- .ats
- .auc
- .auf
- .avc
- .avd
- .avg
- .avz
- .awdb
- .awss
- .awwp
- .axl
- .azz
- .b2
- .backup
- .bad
- .bai
- .bar
- .basex
- .bb
- .bbk
- .bbt
- .bc3
- .bch
- .bcm
- .bdb
- .bde
- .bes
- .bf2
- .bfp
- .bgl
- .bi
- .bib
- .bibtex
- .bjl
- .bks
- .bky
- .blb
- .blo
- .blu
- .bml
- .bmx
- .bnd
- .bok
- .bom
- .bp
- .bp2
- .bp3
- .bpd
- .bpo
- .bpp
- .bps
- .bqy
- .brz
- .bsm
- .bson
- .bsq
- .bswx
- .btf
- .btk
- .btq
- .btr
- .btv
- .btx
- .bvw
- .bw1
- .bws
- .bxd
- .bzm
- .cac
- .ndl
- .cag
- .caj
- .cbb
- .cbd
- .cbh
- .cbs
- .cbv
- .cbz
- .cc
- .ccd
- .ccf
- .cdb
- .cdbcmsg
- .cdf
- .cdm
- .cds
- .cdt
- .cdwlxml
- .ced
- .cef
- .celtx
- .cep
- .cezeokey
- .cfm
- .cfml
- .cgi
- .ch
- .changedb
- .changedb-journal
- .chp
- .cht
- .chy
- .cid
- .cidb
- .ciw
- .cjd
- .cka
- .ckp
- .ckv
- .ckz
- .cld
- .clf
- .clr
- .cls
- .clw
- .cma
- .cmdb
- .cmxl
- .cnd
- .cnf
- .cnr
- .tsm
- .pem
- .csr
- .key
- .frt
- .sxc
- .gzip
- .bkf
- .d
- .bc
- .bgc
- .zepto
- .mq4
- .forex
- .lic
- .srv
- .chr
- .wnd
- .adb
- .car
- .ver
- .qbw
- .nd
- .lgb
- .tlg
- .qbb
- .pub
- .cly
- .gly
- .web
- .ctl
- .cpz
- .pqz
- .pic
- .sts
- .vmdk
- .vmem
It renames encrypted files using the following names:
- {original filename and extension}dxxd
It deletes itself after execution.
NOTES:
It encrypts files in the following location:
It avoids encrypting files in folders and subfolders with names:
By modifying the registry entries for the Legal Notice, It will display the following everytime the user will log in:
It drops the following ransom note:
SOLUTION
9.800
12.830.02
11 Oct 2016
12.831.00
12 Oct 2016
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- LegalNoticeCaption = Microsoft Windows Security Center. Dear Administrator, Your server hacked. For more informations and recommendations, write to our experts by e-mail: rep_stosd@protonmail.com or rep_stosd@tuta.io.
- LegalNoticeCaption = Microsoft Windows Security Center. Dear Administrator, Your server hacked. For more informations and recommendations, write to our experts by e-mail: rep_stosd@protonmail.com or rep_stosd@tuta.io.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- LegalNoticeText = When you start Windows, WindowsDefender works to help protect your PC by scanning for malicious or unwanted software.
- LegalNoticeText = When you start Windows, WindowsDefender works to help protect your PC by scanning for malicious or unwanted software.
Step 4
Search and delete this file
- {Path of Encrypted Files}/ReadMe.TxT
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_DXXD.A. 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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