Overview

overview

7

Static

static

1

i686.elf

ubuntu-22.04-amd64

7

Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    ubuntu-22.04_amd64
  • resource
    ubuntu2204-amd64-20250619-en
  • resource tags

    arch:amd64arch:i386image:ubuntu2204-amd64-20250619-enkernel:5.15.0-105-genericlocale:en-usos:ubuntu-22.04-amd64system
  • submitted
    10/07/2025, 12:14

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General

  • Target
    i686.elf
  • Size 573KB
  • Sample250710-pef1yshp21
  • SHA256 8a53f093762bd090f48e056b79c140ff7159ee24089c41063de185942f112e19
  • MD5 SHA1 SHA512 SSDEEP
Score
7/10
antivmdefense_evasiondiscoveryexecutionpersistenceprivilege_escalation

Malware Config

Signatures

  • Renames itself 1 IoCs
  • Checks hardware identifiers (DMI) 1 TTPs 2 IoCs

    Checks DMI information which indicate if the system is a virtual machine.

    antivm
  • Creates/modifies Cron job 1 TTPs 1 IoCs

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

    executionpersistenceprivilege_escalation
  • Enumerates running processes

    Discovers information about currently running processes on the system

  • Reads MAC address of network interface 2 TTPs 1 IoCs

    Fetches the MAC address of active network interfaces. May be used to detect known values for hypervisors.

    defense_evasiondiscovery
  • Reads hardware information 1 TTPs 4 IoCs

    Accesses system info like serial numbers, manufacturer names etc.

    discovery
  • Checks CPU configuration 1 TTPs 1 IoCs

    Checks CPU information which indicate if the system is a virtual machine.

    antivm
  • Enumerates kernel/hardware configuration 1 TTPs 1 IoCs

    Reads contents of /sys virtual filesystem to enumerate system information.

    discovery
  • Reads runtime system information 64 IoCs

    Reads data from /proc virtual filesystem.

    discovery
  • Writes file to tmp directory 1 IoCs

    Malware often drops required files in the /tmp directory.

Processes

  • /usr/bin/crontab
    crontab -l
    1⤵
      PID:1570
    • /usr/bin/crontab
      crontab -
      1⤵
      • Creates/modifies Cron job
      PID:1573
    • /usr/bin/crontab
      crontab -l
      1⤵
        PID:1574
      • /root/.sys/configuration
        /tmp/i686.elf
        1⤵
        • Checks hardware identifiers (DMI)
        • Reads MAC address of network interface
        • Reads hardware information
        • Checks CPU configuration
        • Enumerates kernel/hardware configuration
        • Reads runtime system information
        • Writes file to tmp directory
        PID:1568

      Network

            MITRE ATT&CK Enterprise v16

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            Downloads

            tmp.nrlinh
            • Path /var/spool/cron/crontabs/tmp.nrlinh
            • Size 208B
            • SHA256 25e5d03519e48083bcb88d5ee88f1d7e789e08ddca9ebfd2c8f7eed4c3de24d2
            • MD5 SHA1 SHA512
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