Analysis by: Neljorn Nathaniel Aguas

 ALIASES:

Ransom:Linux/Interlock.A (MICROSOFT)

 PLATFORM:

FreeBSD

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Canal de infecção: Dropped by other malware, Downloaded from the Internet

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. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

Tipo de compactação: 808,240 bytes
Tipo de arquivo: ELF
Residente na memória: No
Data de recebimento das amostras iniciais: 10 Oct 2024
Carga útil: 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 accepts the following parameters:

  • -d | --directory → encrypts a specified directory including its subdirectories
  • -f | --file → encrypts a specified file
  • -del | --delete → encrypts files then deletes itself using unlink() system call
  • -s | --system

Ransomware Routine

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

  • {Any String}boot.cfg
  • {Any String}!__README__!.txt

It avoids encrypting files found in the following folders:

  • bin
  • boot
  • cdrom
  • dev
  • etc
  • home
  • lib
  • lib32
  • lib64
  • libx32
  • lost+found
  • media
  • mnt
  • opt
  • proc
  • root
  • run
  • sbin
  • snap
  • srv
  • sys
  • tmp
  • usr
  • var

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

  • .interlock

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

  • {Encrypted Path}/!__README__!.txt

It avoids encrypting files with the following file extensions:

  • .b00
  • .sf
  • .t00
  • .v00
  • .v01
  • .v02
  • .v03
  • .v04
  • .v05
  • .v06
  • .v07
  • .interlock

  SOLUTION

Mecanismo de varredura mínima: 9.800
Primeiro arquivo padrão VSAPI: 19.700.06
Data do lançamento do primeiro padrão VSAPI: 07 Nov 2024
VSAPI OPR Pattern Version: 19.701.00
VSAPI OPR Pattern veröffentlicht am: 08 Nov 2024

Step 1

Scan your computer with your Trend Micro product to delete files detected as Ransom.FreeBSD.INTERLOCK.THJBBBD. 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 2

Restore encrypted files from backup.


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