Ransom.Win32.FORMA.THABABAH

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 adds certain registry entries to disable the Task Manager. This action prevents users from terminating the malware process, which can usually be done via the Task Manager.

It encrypts files with specific file extensions. It encrypts files found in specific folders. It drops files as ransom note.

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 files:

• %Temp%\wallpaper3.bmp
• %User Profile%\SystemKey.txt
• %User Profile%\winsys.txt
• %User Profile%\winsys2.txt
• %User Profile%\winsys3.txt

(Note: %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.)

It drops and executes the following files:

• %User Profile%\table.exe
• %Temp%\1.Bat
• %Temp%\2.Bat
• %Temp%\3.Bat
• %Temp%\4.Bat
• %Temp%\admin.exe
• %Temp%\AdobeAcrobatReader.exe
• %Temp%\invisible.vbs
• %Temp%\FORMA.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.. %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)

Autostart Technique

This Ransomware drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

• syswin32.lnk

Other System Modifications

This Ransomware adds the following registry entries to disable the Task Manager:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = 1

It changes the desktop wallpaper by modifying the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
wallpaper = %Temp%\wallpaper3.bmp

(Note: The default value data of the said registry entry is {value}.)

HKEY_CURRENT_USER\Control Panel\Desktop
WallpaperStyle = 2

(Note: The default value data of the said registry entry is 0.)

Other Details

This Ransomware does the following:

• It connects to the following website to download the photo that will be used for the wallpaper:
  
  • https://{BLOCKED}plik.pl/files/70400aa39abbd947416ab0f48811c848.bmp
• It locks the screen and display the following:
  
  • 
  
  
  • 
  
  
  • 

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .#vc
• .$ac
• .00c
• .07g
• .07i
• .08i
• .09i
• .09t
• .10t
• .11t
• .123
• .13t
• .1pa
• .1pe
• .2011
• .2012
• .2013
• .2014
• .2015
• .2016
• .2017
• .210
• .3dm
• .3ds
• .3g2
• .3gp
• .3me
• .3pe
• .500
• .7z
• ._vc
• .aac
• .aaf
• .ab4
• .ac2
• .acc
• .accd
• .ach
• .aci
• .acm
• .acr
• .aep
• .aepx
• .aes
• .aet
• .afm
• .ai
• .aif
• .amj
• .as
• .as3
• .asc
• .asf
• .asm
• .asp
• .asx
• .ati
• .avi
• .back
• .bak
• .bay
• .bc8
• .bc9
• .bd2
• .bd3
• .bgt
• .bk2
• .bkf
• .bmp
• .bpf
• .bpw
• .brd
• .brw
• .btif
• .bz2
• .c
• .cal
• .cat
• .cb
• .cd
• .cdf
• .cdr
• .cdt
• .cdx
• .cf8
• .cf9
• .cfdi
• .cfp
• .cgm
• .cgn
• .ch
• .chg
• .cht
• .clas
• .clk
• .cmd
• .cmx
• .cnt
• .cntk
• .coa
• .cpp
• .cpt
• .cpw
• .cpx
• .crt
• .cs
• .csl
• .csr
• .css
• .csv
• .cur
• .cus
• .d07
• .dac
• .dat
• .db
• .dbf
• .dch
• .dcr
• .ddd
• .dds
• .defx
• .der
• .des
• .dgc
• .dif
• .dip
• .djv
• .djvu
• .dng
• .doc
• .docb
• .docm
• .docx
• .dot
• .dotm
• .dotx
• .drw
• .ds4
• .dsb
• .dsf
• .dtau
• .dtd
• .dtl
• .dwg
• .dxf
• .dxi
• .ebc
• .ebd
• .ebq
• .ec8
• .efs
• .efsl
• .efx
• .emd
• .eml
• .emp
• .ens
• .ent
• .epa
• .epb
• .eps
• .eqb
• .ert
• .esk
• .ess
• .esv
• .etq
• .ets
• .exp
• .fa1
• .fa2
• .fca
• .fcpa
• .fcpr
• .fcr
• .fef
• .ffd
• .fim
• .fla
• .flac
• .flv
• .fmv
• .fon
• .fpx
• .frm
• .fx0
• .fx1
• .fxr
• .fxw
• .fyc
• .gdb
• .gem
• .gfi
• .gif
• .gnc
• .gpc
• .gpg
• .gsb
• .gto
• .gz
• .h
• .h10
• .h11
• .h12
• .hbk
• .hif
• .hpp
• .hsr
• .html
• .hts
• .hwp
• .i2b
• .iban
• .ibd
• .ico
• .idml
• .iff
• .iif
• .img
• .imp
• .indb
• .indd
• .indl
• .indt
• .int?
• .intu
• .inv
• .inx
• .ipe
• .ipg
• .itf
• .jar
• .java
• .jng
• .jp2
• .jpeg
• .jpg
• .js
• .jsd
• .jsda
• .jsp
• .kb7
• .kd3
• .kdc
• .key
• .kmo
• .kmy
• .lay
• .lay6
• .lcd
• .ldc
• .ldf
• .ldr
• .let
• .lgb
• .lhr
• .lid
• .lin
• .lld
• .lmr
• .log
• .lua
• .lz
• .m
• .m10
• .m11
• .m12
• .m14
• .m15
• .m16
• .m3u
• .m3u8
• .m4a
• .m4u
• .m4v
• .mac
• .max
• .mbsb
• .md
• .mda
• .mdb
• .mdf
• .mef
• .mem
• .met
• .meta
• .mhtm
• .mid
• .mkv
• .ml2
• .ml9
• .mlb
• .mlc
• .mmb
• .mml
• .mmw
• .mn1
• .mn2
• .mn3
• .mn4
• .mn5
• .mn6
• .mn7
• .mn8
• .mn9
• .mne
• .mnp
• .mny
• .mone
• .mov
• .mp2
• .mp3
• .mp4
• .mpa
• .mpe
• .mpeg
• .mpg
• .mql
• .mrq
• .ms11
• .msg
• .mwi
• .mws
• .mx0
• .myd
• .mye
• .myi
• .myox
• .n43
• .nap
• .nd
• .nef
• .nl2
• .nni
• .npc
• .nv
• .nv2
• .oab
• .obi
• .odb
• .odc
• .odg
• .odm
• .odp
• .ods
• .odt
• .oet
• .ofc
• .ofx
• .old
• .omf
• .op
• .orf
• .ost
• .otg
• .otp
• .ots
• .ott
• .p08
• .p12
• .p7b
• .p7c
• .paq
• .pas
• .pat
• .pcd
• .pcif
• .pct
• .pcx
• .pd6
• .pdb
• .pdd
• .pdf
• .pem
• .per
• .pfb
• .pfd
• .pfx
• .pg
• .php
• .pic
• .pl
• .plb
• .pls
• .plt
• .pma
• .pmd
• .png
• .pns
• .por
• .pot
• .potm
• .potx
• .pp4
• .pp5
• .ppam
• .ppf
• .ppj
• .pps
• .ppsm
• .ppsx
• .ppt
• .pptx
• .pr0
• .pr1
• .pr2
• .pr3
• .pr4
• .pr5
• .prel
• .prf
• .prn
• .prpr
• .ps
• .psd
• .psp
• .pst
• .ptb
• .ptdb
• .ptk
• .ptx
• .pvc
• .pxa
• .py
• .q00
• .q01
• .q06
• .q07
• .q08
• .q09
• .q43
• .q98
• .qb1
• .qb20
• .qba
• .qbb
• .qbi
• .qbk
• .qbm
• .qbmb
• .qbmd
• .qbo
• .qbp
• .qbr
• .qbw
• .qbx
• .qby
• .qbz
• .qch
• .qcow
• .qdf
• .qdfx
• .qdt
• .qel
• .qem
• .qfi
• .qfx
• .qif
• .qix
• .qme
• .qml
• .qmt
• .qmtf
• .qnx
• .qob
• .qpb
• .qpd
• .qpg
• .qph
• .qpi
• .qsd
• .qsm
• .qss
• .qst
• .qtx
• .quic
• .quo
• .qw5
• .qwc
• .qwmo
• .qxf
• .r3d
• .ra
• .raf
• .rar
• .raw
• .rb
• .rcs
• .rda
• .rdy
• .reb
• .rec
• .resx
• .rif
• .rm
• .rpf
• .rsspptm
• .rtf
• .rtp
• .rw2
• .rwl
• .rz
• .s12
• .s7z
• .saf
• .saj
• .say
• .sba
• .sbc
• .sbd
• .sbf
• .scd
• .sch
• .sct
• .sdf
• .sdy
• .seam
• .ses
• .set
• .shw
• .sic
• .skg
• .sldm
• .sldx
• .slk
• .slp
• .sql
• .sqli
• .sr2
• .srf
• .ssg
• .stc
• .std
• .sti
• .stm
• .str
• .stw
• .svg
• .swf
• .sxc
• .sxd
• .sxi
• .sxm
• .sxw
• .t00
• .t01
• .t02
• .t03
• .t04
• .t05
• .t06
• .t07
• .t08
• .t09
• .t10
• .t11
• .t12
• .t13
• .t14
• .t15
• .t99
• .ta1
• .ta2
• .ta4
• .ta5
• .ta6
• .ta8
• .ta9
• .tar
• .tax
• .tax0
• .tax1
• .tax2
• .tb2
• .tbk
• .tbp
• .tdr
• .text
• .tfx
• .tga
• .tgz
• .tif
• .tiff
• .tkr
• .tlg
• .tom
• .tpl
• .trm
• .trn
• .tt10
• .tt11
• .tt12
• .tt13
• .tt14
• .tt15
• .tt20
• .ttf
• .txf
• .txt
• .u08
• .u10
• .u11
• .u12
• .uop
• .uot
• .v30
• .vb
• .vbpf
• .vbs
• .vcf
• .vdf
• .vdi
• .vmb
• .vmdk
• .vmx
• .vnd
• .vob
• .vsd
• .vyp
• .vyr
• .wac
• .wav
• .wb2
• .wi
• .wk1
• .wk3
• .wk4
• .wks
• .wma
• .wmf
• .wmv
• .wpd
• .wpg
• .wps
• .x3f
• .xaa
• .xcf
• .xeq
• .xhtm
• .xla
• .xlam
• .xlc
• .xlk
• .xll
• .xlm
• .xlr
• .xls
• .xlsb
• .xlsm
• .xlsx
• .xlt
• .xltm
• .xltx
• .xlw
• .xml
• .xpm
• .xqx
• .yuv
• .zdb
• .ziparc
• .zipx
• .zix
• .zka

It encrypts files found in the following folders:

• %Desktop%
• %User Profile%\Downloads
• %Application Data%\Microsoft\Windows\Network Shortcuts

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista, 7, and 8.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)

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

• .locked

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

• %Desktop%\ODSZYFRFUJ_PLIKI_TERAZ.txt

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista, 7, and 8.)