Ransom.MacOS.LOCKBIT.A

 Analysis by: Ricardo III Valdez

 ALIASES:

UDS:Trojan-Ransom.OSX.Agent.gen (KASPERSKY)

 PLATFORM:

MacOS

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

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 avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size:

412,227 bytes

File Type:

Mach-O

Memory Resident:

No

Initial Samples Received Date:

16 Apr 2023

Payload:

Encrypts 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.

Other Details

This Ransomware does the following:

  • It disables the autostart using the following command:
    • vim-cmd hostsvc/autostartmanager/enable_autostart false
  • It runs this command to power off the running virtual machine:
    • esxcli vm process kill--type force--world-id

Ransomware Routine

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

  • restore-my-files.txt
  • xkeyboard-config
  • ntuser.dat.log
  • bootsect.bak
  • autorun.inf
  • thumbs.db
  • iconcache.db

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

  • .lockbit

It leaves text files that serve as ransom notes containing the following text:

It avoids encrypting files with the following file extensions:

  • cmd
  • ani
  • adv
  • msi
  • msp
  • com
  • nls
  • ocx
  • mpa
  • cpl
  • mod
  • hta
  • prf
  • rtp
  • rdp
  • bin
  • shs
  • wpx
  • bat
  • rom
  • msc
  • spl
  • ics
  • key
  • exe
  • dll

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.390.04

FIRST VSAPI PATTERN DATE:

17 Apr 2023

VSAPI OPR PATTERN File:

18.391.00

VSAPI OPR PATTERN Date:

18 Apr 2023

Scan your computer with your Trend Micro product to delete files detected as Ransom.MacOS.LOCKBIT.A. 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:


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