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Ransom.Win32.LOCKBIT.YXEDKZ

April 18, 2024
 Analysis by: Melvin Jhun Palbusa
 ALIASES:

Ransom:Win32/Conti.AD!MTB (MICROSOFT)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, 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 drops files as ransom note.

  TECHNICAL DETAILS

File Size:

237,568 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

11 Apr 2024

Payload:

Encrypts files, 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 drops the following files:

  • {Log File Path}\{Log Filename} → If -log is used

It adds the following processes:

  • cmd.exe %System%\wbem\WMIC.exe shadowcopy where "ID={Shadow Copy ID}" delete → It will repeat this process depending on the number of shadow copies.

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

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

  • hsfjuukjzloqu28oajh727190

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 database storage files by looking for the following strings in their file path:
    • .4dd
    • .4dl
    • .accdb
    • .accdc
    • .accde
    • .accdr
    • .accdt
    • .accft
    • .adb
    • .ade
    • .adf
    • .adp
    • .arc
    • .ora
    • .alf
    • .ask
    • .btr
    • .bdf
    • .cat
    • .cdb
    • .ckp
    • .cma
    • .cpd
    • .dacpac
    • .dad
    • .dadiagrams
    • .daschema
    • .db
    • .db-shm
    • .db-wal
    • .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
    • .fmp
    • .fmp12
    • .fmpsl
    • .fol
    • .fp3
    • .fp4
    • .fp5
    • .fp7
    • .fpt
    • .frm
    • .gdb
    • .grdb
    • .gwi
    • .hdb
    • .his
    • .ib
    • .idb
    • .ihx
    • .itdb
    • .itw
    • .jet
    • .jtx
    • .kdb
    • .kexi
    • .kexic
    • .kexis
    • .lgc
    • .lwx
    • .maf
    • .maq
    • .mar
    • .mas
    • .mav
    • .mdb
    • .mdf
    • .mpd
    • .mrg
    • .mud
    • .mwb
    • .myd
    • .ndf
    • .nnt
    • .nrmlib
    • .ns2
    • .ns3
    • .ns4
    • .nsf
    • .nv
    • .nv2
    • .nwdb
    • .nyf
    • .odb
    • .oqy
    • .orx
    • .owc
    • .p96
    • .p97
    • .pan
    • .pdb
    • .pdm
    • .pnz
    • .qry
    • .qvd
    • .rbf
    • .rctd
    • .rod
    • .rodx
    • .rpd
    • .rsd
    • .sas7bdat
    • .sbf
    • .scx
    • .sdb
    • .sdc
    • .sdf
    • .sis
    • .spq
    • .sql
    • .sqlite
    • .sqlite3
    • .sqlitedb
    • .te
    • .temx
    • .tmd
    • .tps
    • .trc
    • .trm
    • .udb
    • .udl
    • .usr
    • .v12
    • .vis
    • .vpd
    • .vvv
    • .wdb
    • .wmdb
    • .wrk
    • .xdb
    • .xld
    • .xmlff
    • .abcddb
    • .abs
    • .abx
    • .accdw
    • .adn
    • .db2
    • .fm5
    • .hjt
    • .icg
    • .icr
    • .kdb
    • .lut
    • .maw
    • .mdn
    • .mdt
  • It encrypts disk image files by looking for the following file extensions in their file path:
    • .vdi
    • .vhd
    • .vmdk
    • .pvm
    • .vmem
    • .vmsn
    • .vmsd
    • .nvram
    • .vmx
    • .raw
    • .qcow2
    • .subvol
    • .bin
    • .vsv
    • .avhd
    • .vmrs
    • .vhdx
    • .avdx
    • .vmcx
    • .iso
  • It uses the Windows Restart Manager to unlock files it will encrypt.

It accepts the following parameters:

  • -p {Directory} → Encrypts the specific directory first
  • -size {chunk mode}
  • -log {Log File Path}\{Log Filename} → Log output to {Log File Path}\{Log Filename}
  • -nomutex → No mutex will be created
  • -m → {all|local|net|backups}
    • all → combination of net and local
    • local → delete backups and encrypt only locally found drives
    • net → delete backups and encrypt only network shares
    • backups → delete backups
  • -q → Does not append extension to encrypted files and won't drop the ransom note.

Ransomware Routine

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

  • .exe
  • .dll
  • .lnk
  • .sys
  • .msi
  • !!!-Restore-My-Files-!!!.txt
  • CONTI_LOG.txt
  • .bat
  • .3545c5e9

It avoids encrypting files with the following strings in their file path:

  • 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:

  • .3545c5e9

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

  • {Encrypted Directory}\!!!-Restore-My-Files-!!!.txt

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.273.00

FIRST VSAPI PATTERN DATE:

11 Apr 2024

VSAPI OPR PATTERN File:

19.273.00

VSAPI OPR PATTERN Date:

12 Apr 2024

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:

     
    • Ransom.Win32.TRX.XXPE50FFF079

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

Search and delete this file

[ Learn More ]
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.
  • {Log File Path}\{Log Filename}
  • {Encrypted Directory}\!!!-Restore-My-Files-!!!.txt

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.LOCKBIT.YXEDKZ. 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 6

Restore encrypted files from backup.


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