RANSOM_HIDDENTEARZORRO.A

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 a website to send and receive information.

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%\Microsoft\svchost.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:

• %User Temp%\melt.txt - contains malware full path
• %User Profile%\Documents\l\{user name} passcode.txt - contains gathered information

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.. %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 and 7.)

It drops and executes the following files:

• %User Profile%\shwdFtY8245PqWQWf.bat - used to delete shadow copies
• %User Profile%\Take_Seriously (Your saving grace).txt - ransom note

(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 and 7.)

It creates the following folders:

• %User Profile%\Documents\l

(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 and 7.)

Other System Modifications

This Ransomware modifies the following registry entries:

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

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

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

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoWindowsUpdate = 1

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = 1

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

Backdoor Routine

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

• ftp://ftp.{BLOCKED}q.com.plenty{filename of each textfile}

Information Theft

This Ransomware gathers the following data:

• Data from text files (files with .txt extension) in all directories
• Username
• PC name
• OS name
• OS version
• OS platform

Other Details

This Ransomware encrypts files with the following extensions:

• .1
• .10
• .11
• .12
• .13
• .14
• .15
• .16
• .17
• .18
• .19
• .1cd
• .2
• .20
• .3
• .3dm
• .3Ds
• .3fr
• .3g2
• .3gp
• .3pr
• .4
• .5
• .6
• .7
• .7z
• .7zip
• .8
• .9
• .aac
• .ab4
• .abd
• .abh
• .acc
• .accdb
• .accde
• .accdr
• .accdt
• .ach
• .aco
• .acr
• .act
• .adb
• .adp
• .ads
• .aes
• .aff
• .aft
• .agdl
• .ai
• .aiff
• .ait
• .al
• .alv
• .aoi
• .apj
• .apk
• .arw
• .ascx
• .asd
• .asf
• .asl
• .asm
• .asp
• .aspx
• .asset
• .asx
• .atb
• .atn
• .aux
• .avi
• .awg
• .ax
• .axd
• .back
• .backup
• .backupdb
• .bak
• .bank
• .bay
• .bdb
• .bgt
• .big
• .bik
• .bin
• .bkp
• .blend
• .bmp
• .bpw
• .bsa
• .c
• .c00
• .c01
• .c02
• .c03
• .c04
• .c05
• .c06
• .c07
• .c96
• .c97
• .c99
• .cache
• .cash
• .cdb
• .cdf
• .cdr
• .cdr3
• .cdr4
• .cdr5
• .cdr6
• .cdrw
• .cdx
• .ce1
• .ce2
• .cer
• .cfg
• .cfm
• .cfn
• .cg
• .cgm
• .chm
• .cib
• .Class
• .cls
• .cmt
• .conf
• .config
• .contact
• .cpi
• .cpp
• .cr2
• .craw
• .crt
• .crw
• .cry
• .cs
• .csh
• .csh
• .csl
• .csproj
• .css
• .csv
• .d3dbsp
• .dac
• .das
• .dat
• .db
• .db3
• .db_journal
• .dbf
• .dbrsb
• .dbrush
• .dbx
• .dc2
• .dcr
• .dcs
• .ddd
• .ddoc
• .ddrw
• .dds
• .def
• .der
• .des
• .design
• .dgc
• .dgn
• .dic
• .dit
• .djvu
• .dng
• .doc
• .docm
• .docx
• .dot
• .dotm
• .dotx
• .drf
• .drw
• .dtd
• .DTD
• .dwg
• .dxb
• .dxf
• .dxg
• .eap
• .edb
• .eml
• .eps
• .erbsql
• .erf
• .ESD
• .eve
• .exf
• .fdb
• .feed-ms
• .feedsdb-ms
• .ffd
• .fff
• .fh
• .fhd
• .fla
• .flac
• .flb
• .flf
• .flv
• .flvv
• .fon
• .forge
• .fp3
• .fp5
• .fp5
• .fp7
• .fp8
• .fp9
• .fpx
• .full
• .fxg
• .gbk
• .gbr
• .gho
• .gif
• .gitattributes
• .gitignore
• .gray
• .grd
• .grey
• .groups
• .gry
• .h
• .h
• .hbk
• .hdd
• .hdt
• .hlp
• .hpp
• .htm
• .html
• .ibank
• .ibd
• .ibz
• .ico
• .idx
• .iif
• .iiq
• .incpas
• .indd
• .inf
• .inf_loc
• .info
• .info_
• .irs
• .iwi
• .ja
• .jar
• .java
• .jnt
• .jpe
• .jpeg
• .JPG
• .jpg
• .js
• .json
• .jsonlz4
• .jsx
• .k2p
• .kc2
• .kdbx
• .kdc
• .key
• .kpdx
• .kwm
• .laccdb
• .lbf
• .lck
• .ldf
• .list
• .lit
• .litemod
• .litesql
• .little
• .lock
• .log
• .ltx
• .lua
• .m
• .m2ts
• .m3u
• .m4a
• .m4b
• .m4p
• .odp
• .ods
• .odt
• .odt
• .ogg
• .oil
• .old
• .omg
• .one
• .orf
• .ost
• .otg
• .oth
• .otp
• .ots
• .ott
• .p00
• .p01
• .p02
• .p03
• .p04
• .p05
• .p06
• .p07
• .p12
• .p3e
• .p3m
• .p7b
• .p7c
• .p7x
• .p96
• .p97
• .p98
• .pab
• .pages
• .pas
• .pat
• .pat
• .pbf
• .pbk
• .pcd
• .pct
• .pdb
• .pdd
• .pdf
• .pef
• .pfx
• .php
• .php
• .pif
• .pl
• .plc
• .plus_muhd
• .pm
• .pm!
• .pmi
• .pmj
• .pml
• .pmm
• .pmo
• .pmr
• .pnc
• .pnd
• .PNF
• .PNG
• .png
• .pnx
• .pot
• .potm
• .potx
• .ppam
• .ppkg
• .pps
• .ppsm
• .ppsx
• .ppt
• .pptm
• .pptx
• .prf
• .pri
• .Private
• .properties
• .ps
• .psafe3
• .psd
• .psd
• .pset
• .pspimage
• .pst
• .ptx
• .pub
• .pwm
• .py
• .pyc
• .pyd
• .qba
• .qbb
• .qbm
• .qbr
• .qbw
• .qbx
• .qby
• .qcow
• .qcow2
• .qdf
• .qed
• .qtb
• .r3d
• .raf
• .rar
• .rat
• .raw
• .rdb
• .re2
• .re4
• .resources
• .resp
• .resx
• .rm
• .rtf
• .rvt
• .rw2
• .rwl
• .rwz
• .s3db
• .safe
• .sas7bdat
• .sav
• .save
• .say
• .sbstore
• .sd0
• .sda
• .sdb
• .sdf
• .setting
• .settings
• .sh
• .shc
• .sldm
• .sldx
• .slm
• .sln
• .small
• .sql
• .sqlite
• .sqlite - shm
• .sqlite - wal
• .sqlite3
• .sqlitedb
• .sr2
• .srb
• .srf
• .srs
• .srt
• .srw
• .st4
• .st5
• .st6
• .st7
• .st8
• .stc
• .std
• .sti
• .stl
• .stm
• .stw
• .stx
• .suo
• .svg
• .swf
• .sxc
• .sxd
• .sxg
• .sxi
• .sxm
• .sxw
• .sys
• .tax
• .tbb
• .tbk
• .tbn
• .tex
• .tff
• .tga
• .thm
• .tif
• .tiff
• .tlg
• .tlx
• .tme
• .tmp
• .tpl
• .ttf
• .TTF
• .txt
• .upk
• .usr
• .vb
• .vbox
• .vbproj
• .vbs
• .vdi
• .vhd
• .vhdx
• .vmdk
• .vmsd
• .vmx
• .vmxf
• .vob
• .vpd
• .vsd
• .wab
• .wad
• .wallet
• .war
• .wav
• .wb2
• .webm
• .wma
• .wmdb
• .wmf
• .wmv
• .wpd
• .wpl
• .wps
• .x11
• .x3f
• .xaml
• .xeml
• .xis
• .xla
• .xlam
• .xlk
• .xlm
• .xlmx
• .xlr
• .xls
• .xlsb
• .xlsm
• .xlsx
• .xlt
• .xltm
• .xltx
• .xlw
• .xml
• .xml
• .xpi
• .xpi
• .xps
• .xxx
• .ycbcra
• .yuv
• .zap
• .zip
• iros
• .m4p
• .m4v
• .ma
• .mab
• .manifest
• .mapimail
• .max
• .mbx
• .md
• .mdb
• .mdc
• .mdf
• .meek-http-helper
• .mef
• .mfw
• .mht
• .mid
• .middle
• .mkv
• .mlb
• .mmw
• .mnu
• .mny
• .money
• .moneywell
• .mos
• .mov
• .mp3
• .mp4
• .mpeg
• .mpg
• .mrw
• .msf
• .msg
• .mshi
• .mts
• .mui
• .myapp
• .myd
• .nd
• .ndd
• .ndf
• .nef
• .New
• .nk2
• .nop
• .nrw
• .ns2
• .ns3
• .ns4
• .nsd
• .nsf
• .nsg
• .nsh
• .nvram
• .nwb
• .nx2
• .nxl
• .nyf
• .oab
• .obj
• .odb
• .odc
• .odf
• .odg
• .odm

It renames encrypted files using the following names:

• {original filename and extension}.zorro

It does the following:

• It executes the following command to delete the created copy of itself:
  • cmd.exe /C ping 8.8.8.8 -n 1 -w 2 > Nul & Del %Application Data%\Microsoft\svchost.exe
• It deletes shadow copies using the following commands:
  • WMIC.exe /C shadowcopy delete
  • vssadmin.exe Delete Shadows /All /Quiet
• It hides the clock/time on the taskbar

(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.)

NOTES:

The ransomware displays the following ransom note: