RANSOM_WANTMYFILES.A

 Analysis by: Ryan Paolo Maglaque

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


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.

  TECHNICAL DETAILS

File Size:

189,680 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

16 Apr 2017

Payload:

Connects to URLs/IPs, Drops files, Encrypts files

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 copies of itself into the affected system and executes them:

  • %Application Data%\update.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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 drops the following files:

  • %Application Data%\file_list.txt
  • %Application Data%\Locker_ID.txt
  • %Application Data%\Pub_Key.xml

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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 Details

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

  • http://{BLOCKED}yfiles.asia/r.php

It does the following:

  • Execute the following commands:
    • vssadmin.exe delete shadows / ALL / Quiet
    • cipher /w:{Drive Letters}
  • Display the following window:

It deletes itself after execution.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .p7b
  • .p7c
  • .jfif
  • .exif
  • .mkv
  • .wallet
  • .meta
  • .log
  • .asf
  • .pdf
  • .xls
  • .docx
  • .xlsx
  • .mp3
  • .waw
  • .jpg
  • .jpeg
  • .txt
  • .rtf
  • .doc
  • .rar
  • .zip
  • .psd
  • .tif
  • .wma
  • .gif
  • .bmp
  • .ppt
  • .pptx
  • .docm
  • .xlsm
  • .pps
  • .ppsx
  • .ppd
  • .eps
  • .png
  • .ace
  • .djvu
  • .tar
  • .cdr
  • .max
  • .wmv
  • .avi
  • .wav
  • .mp4
  • .pdd
  • .php
  • .aac
  • .ac3
  • .amf
  • .amr
  • .dwg
  • .dxf
  • .accdb
  • .mod
  • .tax2013
  • .tax2014
  • .oga
  • .ogg
  • .pbf
  • .ra
  • .raw
  • .saf
  • .val
  • .wave
  • .wow
  • .wpk
  • .3g2
  • .3gp
  • .3gp2
  • .3mm
  • .amx
  • .avs
  • .bik
  • .dir
  • .divx
  • .dvx
  • .evo
  • .flv
  • .qtq
  • .tch
  • .rts
  • .rum
  • .rv
  • .scn
  • .srt
  • .stx
  • .svi
  • .swf
  • .trp
  • .vdo
  • .wm
  • .wmd
  • .wmmp
  • .wmx
  • .wvx
  • .xvid
  • .3d
  • .3d4
  • .3df8
  • .pbs
  • .adi
  • .ais
  • .amu
  • .arr
  • .bmc
  • .bmf
  • .cag
  • .cam
  • .dng
  • .ink
  • .jif
  • .jiff
  • .jpc
  • .jpf
  • .jpw
  • .mag
  • .mic
  • .mip
  • .msp
  • .nav
  • .ncd
  • .odc
  • .odi
  • .opf
  • .qif
  • .xwd
  • .abw
  • .act
  • .adt
  • .aim
  • .ans
  • .asc
  • .ase
  • .bdp
  • .bdr
  • .bib
  • .boc
  • .crd
  • .diz
  • .dot
  • .dotm
  • .dotx
  • .dvi
  • .dxe
  • .mlx
  • .err
  • .euc
  • .faq
  • .fdr
  • .fds
  • .gthr
  • .idx
  • .kwd
  • .lp2
  • .ltr
  • .mbox
  • .msg
  • .nfo
  • .now
  • .odm
  • .oft
  • .pwi
  • .rng
  • .rtx
  • .run
  • .ssa
  • .text
  • .unx
  • .wbk
  • .wsh
  • .7z
  • .arc
  • .ari
  • .arj
  • .car
  • .cbr
  • .cbz
  • .gz
  • .gzig
  • .jgz
  • .pak
  • .pcv
  • .puz
  • .rev
  • .sdn
  • .sen
  • .sfs
  • .sfx
  • .sh
  • .shar
  • .shr
  • .sqx
  • .tbz2
  • .tg
  • .tlz
  • .vsi
  • .wad
  • .war
  • .xpi
  • .z02
  • .z04
  • .zap
  • .zipx
  • .zoo
  • .ipa
  • .isu
  • .jar
  • .js
  • .udf
  • .adr
  • .ap
  • .aro
  • .asa
  • .ascx
  • .ashx
  • .asmx
  • .asp
  • .indd
  • .asr
  • .qbb
  • .bml
  • .cer
  • .cms
  • .crt
  • .dap
  • .htm
  • .moz
  • .svr
  • .url
  • .wdgt
  • .abk
  • .bic
  • .big
  • .blp
  • .bsp
  • .cgf
  • .chk
  • .col
  • .cty
  • .dem
  • .elf
  • .ff
  • .gam
  • .grf
  • .h3m
  • .h4r
  • .iwd
  • .ldb
  • .lgp
  • .lvl
  • .map
  • .md3
  • .mdl
  • .nds
  • .pbp
  • .ppf
  • .pwf
  • .pxp
  • .sad
  • .sav
  • .scm
  • .scx
  • .sdt
  • .spr
  • .sud
  • .uax
  • .umx
  • .unr
  • .uop
  • .usa
  • .usx
  • .ut2
  • .ut3
  • .utc
  • .utx
  • .uvx
  • .uxx
  • .vmf
  • .vtf
  • .w3g
  • .w3x
  • .wtd
  • .wtf
  • .ccd
  • .cd
  • .cso
  • .disk
  • .dmg
  • .dvd
  • .fcd
  • .flp
  • .img
  • .isz
  • .mdf
  • .mds
  • .nrg
  • .nri
  • .vcd
  • .vhd
  • .snp
  • .bkf
  • .ade
  • .adpb
  • .dic
  • .cch
  • .ctt
  • .dal
  • .ddc
  • .ddcx
  • .dex
  • .dif
  • .dii
  • .itdb
  • .itl
  • .kmz
  • .lcd
  • .lcf
  • .mbx
  • .mdn
  • .odf
  • .odp
  • .ods
  • .pab
  • .pkb
  • .pkh
  • .pot
  • .potx
  • .pptm
  • .psa
  • .qdf
  • .qel
  • .rgn
  • .rrt
  • .rsw
  • .rte
  • .sdb
  • .sdc
  • .sds
  • .sql
  • .stt
  • .tcx
  • .thmx
  • .txd
  • .txf
  • .upoi
  • .vmt
  • .wks
  • .wmdb
  • .xl
  • .xlc
  • .xlr
  • .xlsb
  • .xltx
  • .ltm
  • .xlwx
  • .mcd
  • .cap
  • .cc
  • .cod
  • .cp
  • .cpp
  • .cs
  • .csi
  • .dcp
  • .dcu
  • .dev
  • .dob
  • .dox
  • .dpk
  • .dpl
  • .dpr
  • .dsk
  • .dsp
  • .eql
  • .ex
  • .f90
  • .fla
  • .for
  • .fpp
  • .jav
  • .java
  • .lbi
  • .owl
  • .pl
  • .plc
  • .pli
  • .pm
  • .res
  • .rsrc
  • .so
  • .swd
  • .tpu
  • .tpx
  • .tu
  • .tur
  • .vc
  • .yab
  • .aip
  • .amxx
  • .ape
  • .api
  • .mxp
  • .oxt
  • .qpx
  • .qtr
  • .xla
  • .xlam
  • .xll
  • .xlv
  • .xpt
  • .cfg
  • .cwf
  • .dbb
  • .slt
  • .bp2
  • .bp3
  • .bpl
  • .clr
  • .dbx
  • .jc
  • .potm
  • .ppsm
  • .prc
  • .prt
  • .shw
  • .std
  • .ver
  • .wpl
  • .xlm
  • .yps
  • .1cd
  • .bck
  • .html
  • .bak
  • .odt
  • .pst
  • .log
  • .mpg
  • .mpeg
  • .odb
  • .wps
  • .xlk
  • .mdb
  • .dxg
  • .wpd
  • .wb2
  • .dbf
  • .ai
  • .3fr
  • .arw
  • .srf
  • .sr2
  • .bay
  • .crw
  • .cr2
  • .dcr
  • .kdc
  • .erf
  • .mef
  • .mrw
  • .nef
  • .nrw
  • .orf
  • .raf
  • .rwl
  • .rw2
  • .r3d
  • .ptx
  • .pef
  • .srw
  • .x3f
  • .der
  • .pem
  • .pfx
  • .p12

It avoids encrypting files with the following strings in their file path:

  • WindowsApps
  • WinSxS
  • System32
  • Microsoft.NET
  • SysWOW64
  • SystemApps
  • Windows

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

  • %Desktop%\READ_ME.txt

(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.)

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

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.378.07

FIRST VSAPI PATTERN DATE:

03 May 2017

VSAPI OPR PATTERN File:

13.379.00

VSAPI OPR PATTERN Date:

04 May 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

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • %Application Data%\update.exe
  • %Application Data%\file_list.txt
  • %Application Data%\Locker_ID.txt
  • %Application Data%\Pub_Key.xm
  • %Desktop%\READ_ME.txt

Step 4

Scan your computer with your Trend Micro product to delete files detected as RANSOM_WANTMYFILES.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 5

Restore encrypted files from backup.


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