RANSOM_CRYSIS.THAMARC
Gen:Variant.Ransom.Crysis.6 (Bitdefender), W32/Crysis.L!tr.ransom (Fortinet), Trojan-Ransom.Crysis (Ikarus), Trojan-Ransom.Win32.Crusis.to (Kaspersky), a variant of Win32/Filecoder.Crysis.P trojan (NOD32), Ransom.Crysis.S162740 (Quickheal)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware
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 enables its automatic execution at every system startup by dropping copies of itself into the Windows Common Startup folder.
It is capable of encrypting files in the affected system.
It encrypts files with specific file extensions. It drops files as ransom note.
TECHNICAL DETAILS
214,016 bytes
EXE
Yes
09 Feb 2018
Drops 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 adds the following processes:
- mode con cp select=1251
- vssadmin delete shadows /all /quiet
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{malware file name}.exe = {malware file path}
It enables its automatic execution at every system startup by dropping the following copies of itself into the Windows Common Startup folder:
- %User Startup%\{malware file name}.exe
- %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\{malware file name}.exe
- %User Startup%\Info.hta
- %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.)
Other Details
This Ransomware is capable of encrypting files in the affected system.
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .java
- .accdw
- .adb
- .adp
- .ai
- .ai3
- .asx
- .avi
- .avs
- .bd
- .ai6
- .ai7
- .ai8
- .anim
- .arw
- .as
- .asa
- .asc
- .ascx
- .asm
- .asmx
- .asp
- .aspx
- .asr
- .dat
- .db
- .dbf
- .dbx
- .dc3
- .dcm
- .dcr
- .backup
- .bak
- .bay
- .bin
- .bmp
- .bz2
- .cdr
- .cer
- .cf
- .cfc
- .cfm
- .cfml
- .cfu
- .chm
- .cin
- .class
- .clx
- .config
- .cpp
- .cr2
- .crt
- .crw
- .cs
- .css
- .csv
- .cub
- .dae
- .j2c
- .j2k
- .java
- .jp2
- .jpc
- .jpe
- .jpeg
- .jpf
- .jpg
- .jpx
- .js
- .jsf
- .json
- .der
- .dib
- .dic
- .dif
- .divx
- .djvu
- .dng
- .doc
- .docm
- .docx
- .dot
- .dotm
- .dotx
- .dpx
- .dqy
- .dsn
- .dt
- .dtd
- .dwg
- .dwt
- .dx
- .dxf
- .edml
- .efd
- .elf
- .emf
- .emz
- .epf
- .eps
- .epsf
- .epsp
- .erf
- .exr
- .exe
- .f4v
- .fido
- .flm
- .flv
- .frm
- .fxg
- .geo
- .gif
- .grs
- .gz
- .h
- .hdr
- .hpp
- .hta
- .htc
- .htm
- .html
- .icb
- .ics
- .iff
- .inc
- .indd
- .ini
- .iqy
- .jsp
- .kdc
- .kmz
- .kwm
- .lasso
- .lbi
- .lgf
- .lgp
- .log
- .m1v
- .m4a
- .m4v
- .max
- .md
- .mda
- .mdb
- .mde
- .mdf
- .mdw
- .mef
- .mft
- .mfw
- .mht
- .mhtml
- .mka
- .mkidx
- .mkv
- .mos
- .mov
- .mp3
- .mp4
- .mpeg
- .mpg
- .mpv
- .mrw
- .msg
- .mxl
- .myd
- .myi
- .nef
- .nrw
- .obj
- .odb
- .odc
- .odm
- .odp
- .ods
- .oft
- .one
- .onepkg
- .onetoc2
- .opt
- .oqy
- .orf
- .packlist
- .pas
- .pod
- .p12
- .p7b
- .p7c
- .pam
- .pbm
- .pct
- .pcx
- .pdd
- .pdp
- .pef
- .pem
- .pff
- .pfm
- .pfx
- .pgm
- .php
- .php3
- .php4
- .php5
- .phtml
- .pict
- .pl
- .pls
- .pm
- .png
- .pnm
- .pot
- .potm
- .potx
- .ppa
- .ppam
- .ppm
- .pps
- .ppsm
- .ppt
- .pptm
- .pptx
- .prn
- .ps
- .psb
- .psd
- .pst
- .ptx
- .pub
- .pwm
- .pxr
- .py
- .qt
- .r3d
- .raf
- .rar
- .raw
- .rdf
- .rgbe
- .rle
- .rqy
- .rss
- .rtf
- .rw2
- .rwl
- .safe
- .sct
- .sdpx
- .shtm
- .shtml
- .slk
- .sln
- .sql
- .sr2
- .srf
- .srw
- .ssi
- .st
- .stm
- .svg
- .svgz
- .swf
- .tab
- .tar
- .tbb
- .tbi
- .tbk
- .tdi
- .tga
- .thmx
- .tif
- .tiff
- .tld
- .torrent
- .tpl
- .txt
- .u3d
- .udl
- .uxdc
- .vb
- .vbs
- .vcs
- .vda
- .vdr
- .vdw
- .vdx
- .vrp
- .vsd
- .vss
- .vst
- .vsw
- .vsx
- .vtm
- .vtml
- .vtx
- .wb2
- .wav
- .wbm
- .wbmp
- .wim
- .wmf
- .wml
- .wmv
- .wpd
- .wps
- .x3f
- .xl
- .xla
- .xlam
- .xlk
- .xlm
- .xls
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xltm
- .xltx
- .xlw
- .xml
- .xps
- .xsd
- .xsf
- .xsl
- .xslt
- .xsn
- .xtp
- .xtp2
- .xyze
- .xz
- .zip
It appends the following extension to the file name of the encrypted files:
- .id-{UID}.[{BLOCKED}vv330@gmail.com].java
It drops the following file(s) as ransom note:
- %Desktop%\FILES ENCRYPTED.txt:
all your data has been locked us
You want to return?
write email {BLOCKED}vv330@gmail.com
NOTES:
Displays the following upon successful encryption:
SOLUTION
9.850
14.104.02
02 Mar 2018
14.105.00
03 Mar 2018
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
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {malware file name}.exe = {malware file path}
- {malware file name}.exe = {malware file path}
Step 5
Search and delete these files
- %User Startup%\{malware file name}.exe
- %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\{malware file name}.exe
- %User Startup%\Info.hta
- %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta
- %Desktop%\FILES ENCRYPTED.tx
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_CRYSIS.THAMARC. 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 7
Restore encrypted files from backup.
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