Ransom.Win64.LOCKBIT.YADCK.enc
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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 requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.
It drops files as ransom note.
TECHNICAL DETAILS
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:
- {Encrypted Directory}\_r_e_a_d_m_e.txt
- %User Temp%\zcennqz.bmp
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
- %System%\notepad.exe “{path of cy.exe}” --run={4 digit password} --pt={path of winutils.dll} --cg={path of config.ini} --we={path of cy.exe}
- vssadmin.exe Delete Shadows /All /Quiet ← Deletes shadow copies
- bcdedit.exe /set {default} recoveryenabled No ← Disables recovery
- bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures ← Ignore any boot failures
- wbadmin.exe DELETE SYSTEMSTATEBACKUP ← Delete system state backup
- wbadmin.exe DELETE SYSTEMSTATEBACKUP –deleteOldest
- wbadmin.exe delete catalog –quiet ← Delete the backup catalog for Windows Server Backup
- wbadmin.exe delete backup ← Delete the backup
- wbadmin.exe delete systemstatebackup -keepversions:0
- wevtutil.exe clear-log Application ← Clears application logs
- wevtutil.exe clear-log Security ← Clears security logs
- wevtutil.exe clear-log System ← Clears system logs
- wevtutil.exe clear-log "windows powershell" ← Clears windows powershell logs
- wmic.exe SHADOWCOPY /nointeractive
- Stop the following services using "net.exe stop"
- net.exe stop MSDTC
- net.exe stop SQLSERVERAGENT
- net.exe stop MSSQLSERVER
- net.exe stop vds
- net.exe stop SQLWriter
- net.exe stop SQLBrowser
- net.exe stop MSSQLSERVER
- net.exe stop MSSQL$CONTOSO1
- netsh.exe advfirewall set currentprofile state off
- netsh.exe firewall set opmode mode=disable ← Disables Windows firewall
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Other System Modifications
This Ransomware adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\ComputerName\ActiveComputerName
ComputerName = {Username}
It changes the desktop wallpaper by modifying the following registry entries:
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = %User Temp%\zcennqz.bmp
File Infection
This Ransomware avoids infecting folders containing the following strings:
- .
- ..
- #recycle
- $Recycle.Bin
- Ahnlab
- All Users
- AppData
- Boot
- bootmgr
- Internet Explorer
- Mozilla
- Mozilla Firefox
- NETLOGON
- ntldr
- Opera
- Opera Software
- Policies
- Program Files
- Program Files (x86)
- ProgramData
- scripts
- SYSVOL
- Tor Browser
- Windows
- WINDOWS
It avoids infecting files that contain the following strings in their names:
- .exe
- .dll
- .sys
- .com
- .EXE
- .DLL
- .SYS
- .COM
It avoids infecting the following files:
- 1_config.ini
- AUTOEXEC.BAT
- autoexec.bat
- autorun.inf
- begin.txt
- boot.ini
- bootfont.bin
- bootmgfw.efi
- bootmgr.efi
- bootsect.bak
- config.ini
- desktop.ini
- finish.txt
- iconcache.db
- ntuser.dat
- NTUSER.DAT
- ntuser.dat.log
- ntuser.dat.LOG1
- ntuser.dat.LOG2
- ntuser.ini
- thumbs.db
- Windows.old
Process Termination
This Ransomware terminates the following services if found on the affected system:
- AcronisAgent
- AcrSch2Svc
- backup
- BackupExecAgentAccelerator
- BackupExecAgentBrowser
- BackupExecDiveciMediaService
- BackupExecJobEngine
- BackupExecManagementService
- BackupExecRPCService
- BackupExecVSSProvider
- CAARCUpdateSvc
- CASAD2DWebSvc
- ccEvtMgr
- ccSetMgr
- DefWatch
- GxBlr
- GxCIMgr
- GxCVD
- GxFWD
- GxVss
- Intuit.QuickBooks.FCS
- memtas
- mepocs
- PDVFSService
- QBCFMonitorService
- QBFCService
- QBIDPService
- RTVscan
- SavRoam
- sophos
- sql
- stc_raw_agent
- svc$
- veeam
- VeeamDeploymentService
- VeeamNFSSvc
- VeeamTransportSvc
- VSNAPVSS
- vss
- YooBackup
- YooIT
- zhudongfangyu
It terminates the following processes if found running in the affected system's memory:
- AcronisAgent
- AcrSch2Svc
- agntsvc.exe
- BackExecRPCService
- backup
- BackupExecAgentAccelerator
- BackupExecDiveciMediaService
- BackupExecJobEngine
- bedbg
- CAARCUpdateSvc
- ccEvtMgr
- Culserver
- dbeng50.exe
- dbeng8
- dbsnmp.exe
- dbsrv12.exe
- DefWatch
- encsvc.exe
- excel.exe
- firefox.exe
- infopath.exe
- Intuit.QuickBooks.FCS
- isqlplussvc.exe
- memtas
- mepocs
- msaccess.exe
- MSExchange
- msftesql-Exchange
- msmdsrv
- mspub.exe
- MSSQL
- mydesktopqos.exe
- mydesktopservice.exe
- ocautoupds.exe
- ocomm.exe
- ocssd.exe
- onenote.exe
- oracle.exe
- outlook.exe
- PDVFSService
- powerpnt.exe
- QBCFMonitorService
- QBFCService
- QBIDPService
- SavRoam
- sophos
- sqbcoreservice.exe
- sql.exe
- sqladhlp
- SQLADHLP
- sqlagent
- SQLAgent
- SQLAgent$SHAREPOINT
- SQLBrowser
- SQLWriter
- steam.exe
- synctime.exe
- tbirdconfig.exe
- thebat.exe
- thunderbird.exe
- tomcat6
- veeam
- VeeamDeploymentService
- VeeamNFSSvc
- VeeamTransportSvc
- visio.exe
- vmware-converter
- vmware-usbarbitator64
- WinSAT.exe
- winword.exe
- wordpad.exe
- wrapper.exe
- WSBExchange
- xfssvccon.exe
- YooBackup
Other Details
This Ransomware does the following:
- Requires the "-run={4 digit password}" parameter to execute the ransomware
- Delete itself and the files used to execute the ransomware after execution
- The ransomware does not encrypt files and shuts down if the default language of the system or user is one of the following:
- Russian
- Ukrainian
- Belarusia
- Tajik
- Armenian
- Azerbaijani Latin
- Azerbaijani Cyrillic
- Georgian
- Kazakh
- Kyrgyz
- Turkmen
- Uzbek Latin
- Uzbek Cyrillic
- Russian Moldova
It accepts the following parameters:
- -run={4 digit password} ← Password needed to execute the sample
- -nomutex ← Do not check the mutex
- -log ← Create log files
- -nodel ← Do not self-delete on execution
- -path={path} ← Encrypt only the specified path
- -noshare ← Do not encrypt shares
- -pt={path of winutils.dll} ← State the loader DLL
- -cg={path of config.ini} ← State the configuration file that stores the ransomware
- -we={path of cy.exe} ← State the main executable
- -diskpart ← Use diskpart.exe to clear the “Read-only” attribute of disk volumes
- -nobk ← Do not change the wallpaper of the infected machine.
- -thread={Number of threads per CPU}
- -at={yyyy/MM/dd HH:mm:ss} ← Specify local time when file encryption should start.
- -nomail ← Do not create a ransom note.
- -hostfile={Host file path} ← Path to a text file with a list of hosts to encrypt files on their shared resources.
- -listen={Address:Port} ← Listen mode.
- -srv={Address:Port}
It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.
Ransomware Routine
This Ransomware appends the following extension to the file name of the encrypted files:
- .slpqne{2 digit number from 00 to 98}
It drops the following file(s) as ransom note:
- {Encrypted Directory}\_r_e_a_d_m_e.txt
SOLUTION
Step 1
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 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
Identify and terminate files detected as Ransom.Win64.LOCKBIT.YADCK.enc
- 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.
Step 5
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\SYSTEM\CurrentControlSet\Control\ComputerName\ActiveComputerName
- ComputerName: {Username}
- ComputerName: {Username}
- In HKEY_CURRENT_USER\Control Panel\Desktop
- Wallpaper: %User Temp%\zcennqz.bmp
- Wallpaper: %User Temp%\zcennqz.bmp
Step 6
Search and delete this file
- {Encrypted Directory}\_r_e_a_d_m_e.txt
- %User Temp%\zcennqz.bmp
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win64.LOCKBIT.YADCK.enc. 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 8
Restore encrypted files from backup.
Step 9
Reset your Desktop properties
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