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RANSOM_SAWORSED.A

July 05, 2018
 Analysis by: John Donnie Celestre
 ALIASES:

Trojan-Ransom.HTA.BeCode.l (KASPERSKY), Trojan:VBS/Saworsed.A (MICROSOFT)

 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


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.

However, as of this writing, the said sites are inaccessible.

It encrypts files with specific file extensions.

  TECHNICAL DETAILS

File Size:

25182 bytes

File Type:

HTA

Memory Resident:

Yes

Initial Samples Received Date:

12 Feb 2013

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

  • {directory}\READ_ME_NOW!!!!!!.TXT

Other Details

This Ransomware attempts to access the following websites to download files, which are possibly malicious:

  • https://{BLOCKED}.{BLOCKED}x.com/sh/wn8x35r9l9wsitn/XSwafOFh9E/powershell.exe?dl=1

It does the following:

  • Adds the following salt during encryption:
    • "BMCODE hack your system"

However, as of this writing, the said sites are inaccessible.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .java
  • .jc
  • .jgz
  • .jif
  • .jiff
  • .jpc
  • .jpeg
  • .jpf
  • .jpg
  • .jpw
  • .js
  • .kmz
  • .kwd
  • .lbi
  • .lcd
  • .lcf
  • .ldb
  • .lgp
  • .lnk
  • .lp2
  • .ltm
  • .ltr
  • .lvl
  • .mag
  • .man
  • .1cd
  • .3d
  • .3d4
  • .3df8
  • .3g2
  • .3gp
  • .3gp2
  • .3mm
  • .7z
  • .8ba
  • .8bc
  • .8be
  • .8bf
  • .8bi8
  • .8bl
  • .8bs
  • .8bx
  • .8by
  • .8li
  • .aac
  • .abk
  • .abw
  • .ac3
  • .ace
  • .act
  • .ade
  • .adi
  • .adpb
  • .adr
  • .adt
  • .aim
  • .aip
  • .ais
  • .amf
  • .amr
  • .amu
  • .amx
  • .amxx
  • .ans
  • .ap
  • .ape
  • .api
  • .arc
  • .ari
  • .arj
  • .aro
  • .arr
  • .asa
  • .asc
  • .ascx
  • .ase
  • .ashx
  • .asmx
  • .asp
  • .aspx
  • .asr
  • .atom
  • .avi
  • .avs
  • .bdp
  • .bdr
  • .bi8
  • .bib
  • .bic
  • .big
  • .bik
  • .bin
  • .bkf
  • .blp
  • .bmc
  • .bmf
  • .bml
  • .bmp
  • .boc
  • .bp2
  • .bp3
  • .bpl
  • .bsp
  • .cag
  • .cam
  • .cap
  • .car
  • .cbr
  • .cbz
  • .cc
  • .ccd
  • .cch
  • .cd
  • .cdr
  • .cer
  • .cfg
  • .cgf
  • .chk
  • .clr
  • .cms
  • .cod
  • .col
  • .cp
  • .cpp
  • .crd
  • .crt
  • .cs
  • .csi
  • .cso
  • .css
  • .ctt
  • .cty
  • .cwf
  • .dal
  • .dap
  • .db
  • .dbb
  • .dbx
  • .dcp
  • .dcu
  • .ddc
  • .ddcx
  • .dem
  • .dev
  • .dex
  • .dic
  • .dif
  • .dii
  • .dir
  • .disk
  • .divx
  • .diz
  • .djvu
  • .dmg
  • .dng
  • .dob
  • .doc
  • .docm
  • .docx
  • .dot
  • .dotm
  • .dotx
  • .dox
  • .dpk
  • .dpl
  • .dpr
  • .dsk
  • .dsp
  • .dvd
  • .dvi
  • .dvx
  • .dxe
  • .elf
  • .eps
  • .eql
  • .err
  • .euc
  • .evo
  • .ex
  • .f90
  • .faq
  • .fcd
  • .fdr
  • .fds
  • .ff
  • .fla
  • .flp
  • .flv
  • .for
  • .fpp
  • .gam
  • .gif
  • .grf
  • .gthr
  • .gz
  • .gzig
  • .h3m
  • .h4r
  • .htm
  • .html
  • .idx
  • .img
  • .ink
  • .ipa
  • .iso
  • .isu
  • .isz
  • .itdb
  • .itl
  • .iwd
  • .jar
  • .jav
  • .map
  • .max
  • .mbox
  • .mbx
  • .mcd
  • .md0
  • .md1
  • .md2
  • .md3
  • .md3
  • .mdf
  • .mdl
  • .mdn
  • .mds
  • .mic
  • .mid
  • .midi
  • .mip
  • .mlx
  • .mm6
  • .mm7
  • .mm8
  • .mmf
  • .mod
  • .moz
  • .mp1
  • .mp3
  • .mp4
  • .mpa
  • .mpga
  • .mpu
  • .msg
  • .msi
  • .msp
  • .mxp
  • .nav
  • .ncd
  • .nds
  • .nfo
  • .now
  • .nrg
  • .nri
  • .nrt
  • .odc
  • .odf
  • .odi
  • .odm
  • .odp
  • .ods
  • .oft
  • .oga
  • .ogg
  • .opf
  • .owl
  • .oxt
  • .pab
  • .pak
  • .pbf
  • .pbp
  • .pbs
  • .pcv
  • .pdd
  • .pdf
  • .php
  • .pkb
  • .pkh
  • .pl
  • .plc
  • .pli
  • .pm
  • .png
  • .pot
  • .potm
  • .potx
  • .ppd
  • .ppf
  • .pps
  • .ppsm
  • .ppsx
  • .ppt
  • .pptm
  • .pptx
  • .prc
  • .prt
  • .psa
  • .psd
  • .puz
  • .pwf
  • .pwi
  • .pxp
  • .qdf
  • .qel
  • .qif
  • .qpx
  • .qtiq
  • .qtq
  • .qtr
  • .r00
  • .r01
  • .r02
  • .r03
  • .ra
  • .ram
  • .rar
  • .raw
  • .res
  • .rev
  • .rgn
  • .rnc
  • .rng
  • .rrt
  • .rsrc
  • .rsw
  • .rte
  • .rtf
  • .rts
  • .rtx
  • .rum
  • .run
  • .rv
  • .sad
  • .saf
  • .sav
  • .scm
  • .scn
  • .scx
  • .sdb
  • .sdc
  • .sdn
  • .sds
  • .sdt
  • .sen
  • .sfs
  • .sfx
  • .sh
  • .shar
  • .shr
  • .shw
  • .slt
  • .snp
  • .so
  • .spr
  • .sql
  • .sqx
  • .srf
  • .srt
  • .ssa
  • .std
  • .stt
  • .stx
  • .sud
  • .svi
  • .svr
  • .swd
  • .swf
  • .t01
  • .t03
  • .t05
  • .tbz2
  • .tch
  • .tcx
  • .text
  • .tg
  • .thmx
  • .tif
  • .tiff
  • .tlz
  • .tpu
  • .tpx
  • .trp
  • .tu
  • .tur
  • .txd
  • .txf
  • .txt
  • .uax
  • .udf
  • .umx
  • .unr
  • .unx
  • .uop
  • .upoi
  • .url
  • .usa
  • .usx
  • .ut2
  • .ut3
  • .utc
  • .utx
  • .uvx
  • .uxx
  • .val
  • .vc
  • .vcd
  • .vdo
  • .ver
  • .vhd
  • .vmf
  • .vmt
  • .vsi
  • .vtf
  • .w3g
  • .w3x
  • .wad
  • .war
  • .wav
  • .wave
  • .waw
  • .wbk
  • .wdgt
  • .wks
  • .wm
  • .wma
  • .wmd
  • .wmdb
  • .wmmp
  • .wmv
  • .wmx
  • .wow
  • .wpk
  • .wpl
  • .wsh
  • .wtd
  • .wtf
  • .wvx
  • .xl
  • .xla
  • .xlam
  • .xlc
  • .xll
  • .xlm
  • .xlr
  • .xls
  • .xlsb
  • .xlsm
  • .xlsx
  • .xltx
  • .xlv
  • .xlwx
  • .xml
  • .xpi
  • .xpt
  • .xvid
  • .xwd
  • .yab
  • .yps
  • .z02
  • .z04
  • .zap
  • .zip
  • .zipx
  • .zoo

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

  • .BMCODE

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.458.02

FIRST VSAPI PATTERN DATE:

08 Jun 2017

VSAPI OPR PATTERN File:

13.459.00

VSAPI OPR PATTERN Date:

09 Jun 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

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these files

[ 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.  
  • {directory}\READ_ME_NOW!!!!!!.TXT

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_SAWORSED.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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