General

  • Target
    9066394b24a05f71b1908c6761ea0a37e91a4cb9ab1f718e7ed06f2ff72e79cb.elf
  • Size 5.1MB
  • Sample240922-bsajfavgpr
  • SHA256 9066394b24a05f71b1908c6761ea0a37e91a4cb9ab1f718e7ed06f2ff72e79cb
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • kaiji

C2
  • cc.ava9527.cc:60888

Targets

    • Target
      9066394b24a05f71b1908c6761ea0a37e91a4cb9ab1f718e7ed06f2ff72e79cb.elf
    • Size 5.1MB
    • SHA256 9066394b24a05f71b1908c6761ea0a37e91a4cb9ab1f718e7ed06f2ff72e79cb
    • MD5 SHA1 SHA512 SSDEEP
    • Renames multiple (1156) files with added filename extension

      This suggests ransomware activity of encrypting all the files on the system.

    • Executes dropped EXE

    • Modifies Watchdog functionality

      Malware like Mirai modifies the Watchdog to prevent it restarting an infected system.

    • Reads EFI boot settings

      Reads EFI boot settings from the efivars filesystem, may contain security secrets or sensitive data.

    • Creates/modifies Cron job

      Cron allows running tasks on a schedule, and is commonly used for malware persistence.

    • Creates/modifies environment variables

      Creating/modifying environment variables is a common persistence mechanism.

    • Disables SELinux

      Disables SELinux security module.

    • Enumerates running processes

      Discovers information about currently running processes on the system

    • Modifies init.d

      Adds/modifies system service, likely for persistence.

    • Modifies systemd

      Adds/ modifies systemd service files. Likely to achieve persistence.

    • Write file to user bin folder

    • Modifies Bash startup script

MITRE ATT&CK Enterprise v15

Tasks