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:
- %System%\{MALWARE NAME}.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It adds the following processes:
- "%System%\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "{MALWARE PATH}\{MALWARE NAME}.exe" -Force;
- {MALWARE LOCATION}\{MALWARE NAME}.EXE
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
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 NAME}.exe = %System%\{MALWARE NAME}.exe
It drops the following file(s) in the Startup Items folder to enable its automatic execution at every system startup:
- %User Startup%\{MALWARE NAME}.exe
- %Common Startup%\{MALWARE NAME}.exe
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).. %Common Startup% is the startup folder for all users, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003, or C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Other Details
This Ransomware does the following:
- Modifies the following Windows Defender Actions for defense evasion:
- DisableAntiSpyware
- DisableBehaviorMonitoring
- DisableOnAccessProtection
- DisableScanOnRealtimeEnable
- It deletes shadow copies by executing the following command:
- vssadmin delete shadows /all /quiet
- It sets the currently active code page to 1251 by executing the following command:
- It encrypts files in all fixed, remote and removable drives.
- After encrypting files it execute "info.hta" and "info.hta" displays the following:
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .1cd
- .3g2
- .3gp
- .3fr
- .accda
- .3ds
- .accdb
- .accdc
- .accde
- .accdt
- .accdw
- .adb
- .adp
- .ai3
- .ai4
- .ai5
- .ai6
- .ai7
- .ai8
- .anim
- .arw
- .asa
- .asc
- .ascx
- .asm
- .asmx
- .asp
- .aspx
- .asr
- .asx
- .avi
- .avs
- .backup
- .bak
- .bay
- .bin
- .bmp
- .bz2
- .cdr
- .cer
- .cfc
- .cfm
- .cfml
- .cfu
- .chm
- .cin
- .class
- .clx
- .config
- .cpp
- .cr2
- .crt
- .crw
- .css
- .csv
- .cub
- .dae
- .dat
- .dbf
- .dbx
- .dc3
- .dcm
- .dcr
- .der
- .dib
- .dic
- .dif
- .divx
- .djvu
- .dng
- .doc
- .docm
- .docx
- .dot
- .dotm
- .dotx
- .dpx
- .dqy
- .dsn
- .dtd
- .dwg
- .dwt
- .dxf
- .edml
- .efd
- .elf
- .emf
- .emz
- .epf
- .eps
- .epsf
- .epsp
- .erf
- .exr
- .f4v
- .fido
- .flm
- .flv
- .frm
- .fxg
- .geo
- .gif
- .grs
- .hdr
- .hpp
- .hta
- .htc
- .htm
- .html
- .icb
- .ics
- .iff
- .inc
- .indd
- .ini
- .iqy
- .j2c
- .j2k
- .java
- .jp2
- .jpc
- .jpe
- .jpeg
- .jpf
- .jpg
- .jpx
- .jsf
- .json
- .jsp
- .kdc
- .kmz
- .kwm
- .lasso
- .lbi
- .lgf
- .lgp
- .log
- .m1v
- .m4a
- .m4v
- .max
- .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
- .opt
- .oqy
- .orf
- .p12
- .p7b
- .p7c
- .pam
- .pbm
- .pct
- .pcx
- .pdd
- .pdf
- .pdp
- .pef
- .pem
- .pff
- .pfm
- .pfx
- .pgm
- .php
- .php3
- .php4
- .php5
- .phtml
- .pict
- .pls
- .png
- .pnm
- .pot
- .potm
- .potx
- .ppa
- .ppam
- .ppm
- .pps
- .ppsm
- .ppt
- .pptm
- .pptx
- .prn
- .psb
- .psd
- .pst
- .ptx
- .pub
- .pwm
- .pxr
- .r3d
- .raf
- .rar
- .raw
- .rdf
- .rgbe
- .rle
- .rqy
- .rss
- .rtf
- .rw2
- .rwl
- .safe
- .sct
- .sdpx
- .shtm
- .shtml
- .slk
- .sln
- .sql
- .sr2
- .srf
- .srw
- .ssi
- .stm
- .svg
- .svgz
- .swf
- .tab
- .tar
- .tbb
- .tbi
- .tbk
- .tdi
- .tga
- .thmx
- .tif
- .tiff
- .tld
- .tpl
- .txt
- .u3d
- .udl
- .uxdc
- .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
- .xla
- .xlam
- .xlk
- .xlm
- .xls
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xltm
- .xltx
- .xlw
- .xml
- .xps
- .xsd
- .xsf
- .xsl
- .xslt
- .xsn
- .xtp
- .xtp2
- .xyze
- .zip
It appends the following extension to the file name of the encrypted files:
- .[{BLOCKED}les@{BLOCKED}u.club].lock
It drops the following file(s) as ransom note:
- %Desktop%\FILES ENCRYPTED.txt
- {Encrypted Drives}\FILES ENCRYPTED.txt
- %Common Programs%\info.hta
- %Programs%\info.hta
(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Common Programs% is the folder that contains common program groups for all users, which is usually C:\Documents and Settings\All Users\Start Menu\Programs on Windows 2000, XP, and Server 2003, or C:\ProgramData\Microsoft\Windows\Start Menu\Programs on Windows Vista, 7, and 8.. %Programs% is the folder that contains the user’s program groups, which is usually C:\Windows\Start Menu\Programs or C:\Documents and Settings\{User name}\Start Menu\Programs on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs on Windows Vista, 7, and 8.)
It leaves text files that serve as ransom notes containing the following text:
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
Troj.Win32.TRX.XXPE50FFF039
Step 2
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 3
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 4
Identify and terminate files detected as Ransom.Win32.CRYSIS.TIBGHB
[ Learn More ]
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- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
To terminate the malware/grayware/spyware process:
- Scan your computer with your Trend Micro product and take note of the name of the malware/grayware/spyware detected.
- Open Windows Task Manager. To do this, press CTRL+SHIFT+ESC.
- View the list of all running programs. To do this:
• For Windows 7 and Server 2008 (R2) users, click the Processes tab.
• For Windows 8, 8.1, 10, and Server 2012 (R2) users, click the Details tab. - In the list of running programs, locate a malware/grayware/spyware file detected earlier.
- Select the detected files, then press either the End Task or the End Process button, depending on the version of Windows you are using.
- Do the same for the remaining detected malware/grayware/spyware files in the list of running programs.
- To check if the malware/grayware/spyware process has been terminated, close Task Manager, and then open it again.
- Close Task Manager.
Step 5
Delete this registry value
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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 NAME}.exe = %System%\{MALWARE NAME}.exe
To delete the registry value this malware created:
- Open Registry Editor. To do this:
» For Windows 7 and Windows Server 2008 (R2) users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, Windows 8.1, 10, and Windows Server 2012 (R2) users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter. - In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Run - In the right panel, locate and delete the entry:
{MALWARE NAME}.exe = %System%\{MALWARE NAME}.exe - Close Registry Editor.
Step 6
Search and delete these files
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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.
- %Desktop%\FILES ENCRYPTED.txt
- {Encrypted Drives}\FILES ENCRYPTED.txt
- %Common Programs%\info.hta
- %Programs%\info.hta
To delete malware/grayware files:
For Windows 7 and Server 2008 (R2), 8, 8.1, 10, and Server 2012 (R2):
- Open a Windows Explorer window.
- For Windows 7 and Server 2008 (R2) users, click Start>Computer.
- For Windows 8, 8.1, 10, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
- In the Search Computer/This PC input box, type:
- %Desktop%\FILES ENCRYPTED.txt
- {Encrypted Drives}\FILES ENCRYPTED.txt
- %Common Programs%\info.hta
- %Programs%\info.hta
- Once located, select the file then press SHIFT+DELETE to delete it.
- Repeat the said steps for all files listed.
*Note: Read the following Microsoft page if these steps do not work on Windows 7 and Server 2008 (R2).
Step 7
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.CRYSIS.TIBGHB. 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 the following Trend Micro Support pages for more information:
Step 8
Restore encrypted files from backup.
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