Ransom.Win64.LOCKBIT.YJDIHT

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 does not have any propagation routine.

It does not have any backdoor routine.

It drops files as ransom note. It avoids encrypting files with the following file extensions.

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:

• {Malware File Path}\{Log File Name} → If the parameter -log {Log File Name} is used
• {Log File Path}\{Log File Name} → If the parameter -log {Log File Path}\{Log File Name} is used

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• hsfjuukjzloqu28oajh727190

Other System Modifications

This Ransomware uses Windows Management Instrumentation (WMI) to delete volume shadow copies:

• cmd.exe /c %System%\wbem\WMIC.exe shadowcopy where "ID='{GUID}'" delete

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Propagation

This Ransomware does not have any propagation routine.

Backdoor Routine

This Ransomware does not have any backdoor routine.

Rootkit Capabilities

This Ransomware does not have rootkit capabilities.

Other Details

This Ransomware does the following:

• By default, it encrypts local drives, removable drives and network shares.
• When encrypting network shares it will check if the IP address starts with the following to ensure that it is encrypting local, non-internet, systems:
  
  • 172.
  • 192.168.
  • 10.
  • 169.
• It encrypts files with the following extensions using a different encryption method:
  
  • .4dd
  • .4dl
  • .abcddb
  • .abs
  • .abx
  • .accdb
  • .accdc
  • .accde
  • .accdr
  • .accdt
  • .accdw
  • .accft
  • .adb
  • .ade
  • .adf
  • .adn
  • .adp
  • .alf
  • .arc
  • .ask
  • .avdx
  • .avhd
  • .bdf
  • .bin
  • .btr
  • .cat
  • .cdb
  • .ckp
  • .cma
  • .cpd
  • .dacpac
  • .dad
  • .dadiagrams
  • .daschema
  • .db
  • .db-shm
  • .db-wal
  • .db2
  • .db3
  • .dbc
  • .dbf
  • .dbs
  • .dbt
  • .dbv
  • .dbx
  • .dcb
  • .dct
  • .dcx
  • .ddl
  • .dlis
  • .dp1
  • .dqy
  • .dsk
  • .dsn
  • .dtsx
  • .dxl
  • .eco
  • .ecx
  • .edb
  • .epim
  • .exb
  • .fcd
  • .fdb
  • .fic
  • .fm5
  • .fmp
  • .fmp12
  • .fmps1
  • .fol
  • .fp3
  • .fp4
  • .fp5
  • .fp7
  • .fpt
  • .frm
  • .gdb
  • .grbd
  • .gwi
  • .hdb
  • .his
  • .hjt
  • .ib
  • .icg
  • .icr
  • .idb
  • .ihx
  • .iso
  • .itdb
  • .itw
  • .jet
  • .jtx
  • .kdb
  • .kdb
  • .kexi
  • .kexic
  • .kexis
  • .lgc
  • .lut
  • .lwx
  • .maf
  • .maq
  • .mar
  • .mas
  • .mav
  • .maw
  • .mdb
  • .mdf
  • .mdn
  • .mdt
  • .mpd
  • .mrg
  • .mud
  • .mwb
  • .myd
  • .ndf
  • .nnt
  • .nrmlib
  • .ns2
  • .ns3
  • .ns4
  • .nsf
  • .nv
  • .nv2
  • .nvram
  • .nwdb
  • .nyf
  • .odb
  • .oqy
  • .ora
  • .orx
  • .owc
  • .p96
  • .p97
  • .pan
  • .pdb
  • .pdm
  • .pnz
  • .pvm
  • .qcow2
  • .qry
  • .qvd
  • .raw
  • .rbf
  • .rctd
  • .rod
  • .rodx
  • .rpd
  • .rsd
  • .sas7bdat
  • .sbf
  • .sbf
  • .scx
  • .scx
  • .sdb
  • .sdb
  • .sdc
  • .sdc
  • .sdf
  • .sis
  • .spq
  • .sql
  • .sqlite
  • .sqlite3
  • .sqlitedb
  • .subvol
  • .te
  • .temx
  • .tmd
  • .tps
  • .trc
  • .trm
  • .udb
  • .udl
  • .usr
  • .v12
  • .vdi
  • .vhd
  • .vhdx
  • .vis
  • .vmcx
  • .vmdk
  • .vmem
  • .vmrs
  • .vmsd
  • .vmsn
  • .vmx
  • .vpd
  • .vsv
  • .vvv
  • .wdb
  • .wmdb
  • .wrk
  • .xdb
  • .xld
  • .xmlff
• It appends specific hex values to the encrypted files depending on their file size and extension.

It accepts the following parameters:

• -p {Path} → Encrypts files in the specified path first before encrypting other paths
• -m {all|local|net|backups}
  
  • local → delete backups and encrypt local drives
  • net → delete backups and encrypt only network shares
  • all → combination of net and local
  • backups → delete backups
• -size {chunk mode} → chunk mode for encrypting large files
• -nomutex → does not create mutex
• -log {File name to create} → create a log file in {Malware File Path} unless a different file path is specified

It does not exploit any vulnerability.

Ransomware Routine

This Ransomware avoids encrypting files with the following strings in their file name:

• !!!-Restore-My-Files-!!!.txt
• CONTI_LOG.txt

It avoids encrypting files found in the following folders:

• tmp
• winnt
• temp
• thumb
• $Recycle.Bin
• $RECYCLE.BIN
• System Volume Information
• Boot
• Windows
• Trend Micro
• perflogs

It appends the following extension to the file name of the encrypted files:

• .098fd602

It drops the following file(s) as ransom note:

• {Drive Letter}:\!!!-Restore-My-Files-!!!.txt
• {Directory with Encrypted Files}\!!!-Restore-My-Files-!!!.txt
• %Desktop%\!!!-Restore-My-Files-!!!.txt
  

It avoids encrypting files with the following file extensions:

• .exe
• .dll
• .lnk
• .sys
• .msi
• .bat
• .098fd602