RANSOM_HIDDENTEAR.CRYPKILL
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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.
TECHNICAL DETAILS
28,672 bytes
No
11 Feb 2017
Displays graphics/image, 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.
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Documents\Test\CRYPTOKILL_README.txt - ransom note
- {folder of encrypted files}CRYPTOKILL_README.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.)
Other Details
This Trojan encrypts files with the following extensions:
- .(Security
- .7zip
- .aac
- .accdb
- .accde
- .accdr
- .accdt
- .ach
- .acr
- .act
- .adb
- .adp
- .ads
- .aes
- .agdl
- .aiff
- .ait
- .aoi
- .apj
- .apk
- .ARC
- .arw
- .asc
- .asf
- .asm
- .asp
- .aspx
- .asset
- .asx
- .avi
- .awg
- .back
- .backup
- .backupdb
- .bak
- .bank
- .bat
- .bay
- .bdb
- .bgt
- .bik
- .bin
- .bkp
- .blend
- .bmp
- .bpw
- .brd
- .bsa
- .cdf
- .cdr
- .cdr3
- .cdr4
- .cdr5
- .cdr6
- .cdrw
- .cdx
- .cer
- .cfg
- .cgm
- .cib
- .class
- .cls
- .cmd
- .cmt
- .config
- .contact
- .copy)
- .cpi
- .cpp
- .craw
- .crt
- .crw
- .csh
- .csl
- .csr
- .css
- .csv
- .CSV
- .d3dbsp
- .dac
- .das
- .dat
- .db_journal
- .dbf
- .dbx
- .dch
- .dcr
- .dcs
- .ddd
- .ddoc
- .ddrw
- .dds
- .der
- .des
- .design
- .dgc
- .dif
- .dip
- .dit
- .djv
- .djvu
- .dng
- .doc
- .DOC
- .docb
- .docm
- .docx
- .dot
- .DOT
- .dotm
- .dotx
- .drf
- .drw
- .dtd
- .dwg
- .dxb
- .dxf
- .dxg
- .edb
- .eml
- .eps
- .erbsql
- .erf
- .exf
- .fdb
- .ffd
- .fff
- .fhd
- .fla
- .flac
- .flf
- .flv
- .flvv
- .forge
- .fpx
- .frm
- .fxg
- .gif
- .gpg
- .gray
- .grey
- .groups
- .gry
- .hbk
- .hdd
- .hpp
- .html
- .hwp
- .ibank
- .ibd
- .ibz
- .idx
- .iif
- .iiq
- .incpas
- .indd
- .iwi
- .jar
- .java
- .jnt
- .jpe
- .jpeg
- .jpg
- .kdbx
- .kdc
- .key
- .kpdx
- .kwm
- .laccdb
- .lay
- .lay6
- .lbf
- .ldf
- .lit
- .litemod
- .litesql
- .log
- .ltx
- .lua
- .m2ts
- .mapimail
- .max
- .mbx
- .mdb
- .mdc
- .mdf
- .mef
- .mfw
- .mid
- .mkv
- .mlb
- .mml
- .mmw
- .mny
- .moneywell
- .mos
- .mov
- .mpeg
- .mpg
- .mrw
- .ms11
- .msg
- .myd
- .MYD
- .MYI
- .ndd
- .ndf
- .nef
- .NEF
- .nop
- .nrw
- .nsd
- .nsf
- .nsg
- .nsh
- .nvram
- .nwb
- .nxl
- .nyf
- .oab
- .obj
- .odb
- .odc
- .odf
- .odg
- .odm
- .odp
- .ods
- .odt
- .ogg
- .oil
- .onetoc2
- .orf
- .ost
- .otg
- .oth
- .otp
- .ots
- .ott
- .pab
- .pages
- .PAQ
- .pas
- .pat
- .pcd
- .pct
- .pdb
- .pdd
- .pef
- .pem
- .pfx
- .php
- .pif
- .plc
- .plus_muhd
- .png
- .pot
- .potm
- .potx
- .ppam
- .pps
- .ppsm
- .ppsx
- .ppt
- .PPT
- .pptm
- .pptx
- .prf
- .psafe3
- .psd
- .pspimage
- .pst
- .ptx
- .pwm
- .qba
- .qbb
- .qbm
- .qbr
- .qbw
- .qbx
- .qby
- .qcow
- .qcow2
- .qed
- .raf
- .rar
- .rat
- .raw
- .rdb
- .rtf
- .RTF
- .rvt
- .rwl
- .rwz
- .s3db
- .safe
- .sas7bdat
- .sav
- .save
- .say
- .sch
- .sda
- .sdf
- .sldm
- .sldx
- .slk
- .sql
- .sqlite
- .sqlite3
- .SQLITE3
- .sqlitedb
- .SQLITEDB
- .srf
- .srt
- .srw
- .stc
- .std
- .sti
- .stm
- .stw
- .stx
- .svg
- .swf
- .sxc
- .sxd
- .sxg
- .sxi
- .sxm
- .sxw
- .tar
- .tarbz2
- .tbk
- .tex
- .tga
- .tgz
- .thm
- .tif
- .tiff
- .tlg
- .txt
- .uop
- .uot
- .upk
- .vbox
- .vbs
- .vdi
- .vhd
- .vhdx
- .vmdk
- .vmsd
- .vmx
- .vmxf
- .vob
- .wab
- .wad
- .wallet
- .wav
- .wks
- .wma
- .wmv
- .wpd
- .wps
- .xis
- .xla
- .xlam
- .xlc
- .xlk
- .xlm
- .xlr
- .xls
- .XLS
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xltm
- .xltx
- .xlw
- .xml
- .ycbcra
- .yuv
- .zip
It renames encrypted files using the following names:
- {original filename}.crypto
It does the following:
- Encrypts files located in %User Profile%\Documents\Test
- Displays the following ransom note:
- Contains the following ransom note (CRYPTOKILL_README.txt):
SOLUTION
9.850
13.222.08
15 Feb 2017
13.223.00
16 Feb 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
- %User Profile%\Documents\Test\CRYPTOKILL_README.txt - ransom note
- {folder of encrypted files}CRYPTOKILL_README.txt - ransom note
Step 4
Scan your computer with your Trend Micro product to delete files detected as RANSOM_HIDDENTEAR.CRYPKILL. 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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