Overview

overview

6

Static

static

1

arm4.elf

debian-12-armhf

6

Analysis

  • max time kernel
    149s
  • max time network
    139s
  • platform
    debian-12_armhf
  • resource
    debian12-armhf-20260513-en
  • resource tags

    arch:armhfimage:debian12-armhf-20260513-enkernel:6.1.0-17-armmp-lpaelocale:en-usos:debian-12-armhfsystem
  • submitted
    07/08/2026, 01:54

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General

  • Target
    arm4.elf
  • Size 149KB
  • Sample260807-cbtfnade49
  • SHA256 924194012db5ee8721227fa456bff10954996a7c519bac33babd4236e987c941
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
6/10
discoveryexecutionpersistenceprivilege_escalation

Malware Config

Signatures

  • Creates/modifies Cron job 1 TTPs 1 IoCs

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

    executionpersistenceprivilege_escalation
  • Looks up external IP address via web service 1 TTPs 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

    discovery
  • Modifies rc script 2 TTPs 1 IoCs

    Adding/modifying system rc scripts is a common persistence mechanism.

    persistence
  • Modifies systemd 2 TTPs 1 IoCs

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

    persistenceprivilege_escalation
  • Write file to user bin folder 1 IoCs
    persistence
  • Changes its process name 5 IoCs
  • Reads runtime system information 3 IoCs

    Reads data from /proc virtual filesystem.

    discovery

Processes

  • /tmp/arm4.elf
    /tmp/arm4.elf
    1⤵
    • Modifies rc script
    • Modifies systemd
    • Write file to user bin folder
    • Changes its process name
    • Reads runtime system information
    PID:784
    • /bin/sh
      sh -c "systemctl enable k3jub3wb1s9.service >/dev/null 2>&1"
      2⤵
        PID:805
        • /usr/bin/systemctl
          systemctl enable k3jub3wb1s9.service
          3⤵
          • Reads runtime system information
          PID:806
      • /bin/sh
        sh -c "(crontab -l 2>/dev/null | grep -qF '/usr/local/bin/56g4glu8bd68f11') || { (crontab -l 2>/dev/null; echo '@reboot /usr/local/bin/56g4glu8bd68f11 &') | crontab -; } >/dev/null 2>&1"
        2⤵
          PID:826
          • /usr/bin/grep
            grep -qF /usr/local/bin/56g4glu8bd68f11
            3⤵
            • Reads runtime system information
            PID:829
          • /usr/bin/crontab
            crontab -l
            3⤵
              PID:828
            • /usr/bin/crontab
              crontab -
              3⤵
              • Creates/modifies Cron job
              PID:831
            • /usr/bin/crontab
              crontab -l
              3⤵
                PID:832

          Network

                MITRE ATT&CK Enterprise v16

                Reconnaissance

                Resource Development

                Initial Access

                Execution

                Scheduled Task/Job

                1
                T1053

                Cron

                1
                T1053.003

                Persistence

                Boot or Logon Autostart Execution

                2
                T1547

                XDG Autostart Entries

                1
                T1547.013

                Boot or Logon Initialization Scripts

                1
                T1037

                RC Scripts

                1
                T1037.004

                Create or Modify System Process

                1
                T1543

                Systemd Service

                1
                T1543.002

                Scheduled Task/Job

                1
                T1053

                Cron

                1
                T1053.003

                Privilege Escalation

                Boot or Logon Autostart Execution

                2
                T1547

                XDG Autostart Entries

                1
                T1547.013

                Boot or Logon Initialization Scripts

                1
                T1037

                RC Scripts

                1
                T1037.004

                Create or Modify System Process

                1
                T1543

                Systemd Service

                1
                T1543.002

                Scheduled Task/Job

                1
                T1053

                Cron

                1
                T1053.003

                Defense Evasion

                Credential Access

                Discovery

                System Network Configuration Discovery

                1
                T1016

                Internet Connection Discovery

                1
                T1016.001

                Lateral Movement

                Collection

                Command and Control

                Exfiltration

                Impact

                Replay Monitor

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                Downloads

                k3jub3wb1s9.service
                • Path /etc/systemd/system/k3jub3wb1s9.service
                • Size 186B
                • SHA256 ccc3e3e284d3589cea4f2fae7f3fd794fd6c1e05e101ed19b2dc46adf08880b3
                • MD5 SHA1 SHA512 TLSH
                Submit Download

                56g4glu8bd68f11
                • Path /usr/local/bin/56g4glu8bd68f11
                • Size 149KB
                • SHA256 924194012db5ee8721227fa456bff10954996a7c519bac33babd4236e987c941
                • MD5 SHA1 SHA512 SSDEEP TLSH
                Submit Download

                tmp.LXqoBl
                • Path /var/spool/cron/crontabs/tmp.LXqoBl
                • Size 216B
                • SHA256 574e5bcf85a29c8edd7cc4b0e8803ad7b50915ceb44feb70ac0dcc0288d6ecd1
                • MD5 SHA1 SHA512 TLSH
                Submit Download