Overview

overview

7

Static

static

1

arm4.elf

debian-12-armhf

7

Analysis

  • max time kernel
    149s
  • max time network
    152s
  • 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
    07/10/2026, 16:20

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General

  • Target
    arm4.elf
  • Size 274KB
  • Sample261007-ts74tabv71
  • SHA256 a5ca1ca0b96cd88a51372644a03de594a98330e586efb4555c613dad07ca6d5d
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
credential_accessdefense_evasiondiscoveryexecutionpersistenceprivilege_escalation

Malware Config

Signatures

  • Deletes itself 1 IoCs
  • Modifies the /etc/hosts DNS resolution file 1 TTPs 1 IoCs

    Modifying the /etc/hosts name-resolution file changes IP routing, which can facilitate traffic hijacking or the blocking of (security update) endpoints.

  • Creates/modifies Cron job 1 TTPs 1 IoCs

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

    executionpersistenceprivilege_escalation
  • Creates/modifies environment variables 1 TTPs 8 IoCs

    Creating/modifying environment variables is a common persistence mechanism.

    persistenceprivilege_escalationdefense_evasion
  • Enumerates active TCP sockets 1 TTPs 1 IoCs

    Gets active TCP sockets from /proc virtual filesystem.

    discovery
  • Enumerates running processes

    Discovers information about currently running processes on the system

  • Modifies init.d 2 TTPs 1 IoCs

    Adds/modifies system service, likely for persistence.

    persistence
  • 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
  • Modifies Bash startup script 2 TTPs 8 IoCs
    persistence
  • Reads process memory 1 TTPs 53 IoCs

    Read the memory of a process through the /proc virtual filesystem. This can be used to steal credentials.

    credential_access
  • Changes its process name 2 IoCs
  • Reads system network configuration 1 TTPs 1 IoCs

    Uses contents of /proc filesystem to enumerate network settings.

    discovery
  • Enumerates kernel/hardware configuration 1 TTPs 64 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

Processes

  • /tmp/arm4.elf
    /tmp/arm4.elf
    1⤵
    • Deletes itself
    • Modifies the /etc/hosts DNS resolution file
    • Creates/modifies environment variables
    • Enumerates active TCP sockets
    • Modifies init.d
    • Modifies rc script
    • Modifies systemd
    • Modifies Bash startup script
    • Reads process memory
    • Changes its process name
    • Reads system network configuration
    • Enumerates kernel/hardware configuration
    • Reads runtime system information
    PID:786
    • /bin/sh
      sh -c "systemctl daemon-reload 2>/dev/null"
      2⤵
        PID:815
        • /usr/bin/systemctl
          systemctl daemon-reload
          3⤵
            PID:816
        • /bin/sh
          sh -c "systemctl enable system-service 2>/dev/null"
          2⤵
            PID:832
            • /usr/bin/systemctl
              systemctl enable system-service
              3⤵
                PID:833
            • /bin/chattr
              chattr +ia /var/tmp/.cache/sysd
              2⤵
                PID:834
              • /bin/busybox
                chattr +ia /var/tmp/.cache/sysd
                2⤵
                  PID:835
                • /bin/chattr
                  chattr +ia /etc/systemd/system/system-service.service
                  2⤵
                    PID:836
                  • /bin/busybox
                    chattr +ia /etc/systemd/system/system-service.service
                    2⤵
                      PID:837
                    • /bin/sh
                      sh -c "update-rc.d system-service defaults 2>/dev/null"
                      2⤵
                        PID:853
                        • /usr/sbin/update-rc.d
                          update-rc.d system-service defaults
                          3⤵
                            PID:854
                            • /usr/local/sbin/systemctl
                              systemctl daemon-reload
                              4⤵
                                PID:855
                              • /usr/local/bin/systemctl
                                systemctl daemon-reload
                                4⤵
                                  PID:855
                                • /usr/sbin/systemctl
                                  systemctl daemon-reload
                                  4⤵
                                    PID:855
                                  • /usr/bin/systemctl
                                    systemctl daemon-reload
                                    4⤵
                                      PID:855
                                • /bin/sh
                                  sh -c "[ -d /etc/rc.d ] && ln -sf /etc/init.d/system-service /etc/rc.d/S99system-service 2>/dev/null"
                                  2⤵
                                    PID:871
                                  • /bin/sh
                                    sh -c "crontab -l 2>/dev/null"
                                    2⤵
                                      PID:872
                                      • /usr/bin/crontab
                                        crontab -l
                                        3⤵
                                          PID:873
                                      • /bin/sh
                                        sh -c "(crontab -l 2>/dev/null; echo '* * * * * /var/tmp/.cache/sysd >/dev/null 2>&1 # sysmon') | crontab - 2>/dev/null"
                                        2⤵
                                          PID:874
                                          • /usr/bin/crontab
                                            crontab -
                                            3⤵
                                            • Creates/modifies Cron job
                                            PID:876
                                          • /usr/bin/crontab
                                            crontab -l
                                            3⤵
                                              PID:877
                                          • /bin/chattr
                                            chattr +ia /var/tmp/.cache/sysd
                                            2⤵
                                              PID:884
                                            • /bin/busybox
                                              chattr +ia /var/tmp/.cache/sysd
                                              2⤵
                                                PID:885
                                              • /bin/chattr
                                                chattr +ia /etc/init.d/system-service
                                                2⤵
                                                  PID:886
                                                • /bin/busybox
                                                  chattr +ia /etc/init.d/system-service
                                                  2⤵
                                                    PID:887
                                                  • /bin/chattr
                                                    chattr +ia /etc/systemd/system/system-service.service
                                                    2⤵
                                                      PID:888
                                                    • /bin/busybox
                                                      chattr +ia /etc/systemd/system/system-service.service
                                                      2⤵
                                                        PID:889
                                                      • /bin/chattr
                                                        chattr +ia /var/tmp/.cache/sysd
                                                        2⤵
                                                          PID:896
                                                        • /bin/busybox
                                                          chattr +ia /var/tmp/.cache/sysd
                                                          2⤵
                                                            PID:897
                                                          • /bin/chattr
                                                            chattr +ia /etc/init.d/system-service
                                                            2⤵
                                                              PID:898
                                                            • /bin/busybox
                                                              chattr +ia /etc/init.d/system-service
                                                              2⤵
                                                                PID:899
                                                              • /bin/chattr
                                                                chattr +ia /etc/systemd/system/system-service.service
                                                                2⤵
                                                                  PID:900
                                                                • /bin/busybox
                                                                  chattr +ia /etc/systemd/system/system-service.service
                                                                  2⤵
                                                                    PID:901

                                                                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

                                                                      4
                                                                      T1547

                                                                      XDG Autostart Entries

                                                                      1
                                                                      T1547.013

                                                                      Boot or Logon Initialization Scripts

                                                                      2
                                                                      T1037

                                                                      RC Scripts

                                                                      2
                                                                      T1037.004

                                                                      Create or Modify System Process

                                                                      1
                                                                      T1543

                                                                      Systemd Service

                                                                      1
                                                                      T1543.002

                                                                      Event Triggered Execution

                                                                      1
                                                                      T1546

                                                                      Unix Shell Configuration Modification

                                                                      1
                                                                      T1546.004

                                                                      Hijack Execution Flow

                                                                      1
                                                                      T1574

                                                                      Path Interception by PATH Environment Variable

                                                                      1
                                                                      T1574.007

                                                                      Scheduled Task/Job

                                                                      1
                                                                      T1053

                                                                      Cron

                                                                      1
                                                                      T1053.003

                                                                      Privilege Escalation

                                                                      Boot or Logon Autostart Execution

                                                                      4
                                                                      T1547

                                                                      XDG Autostart Entries

                                                                      1
                                                                      T1547.013

                                                                      Boot or Logon Initialization Scripts

                                                                      2
                                                                      T1037

                                                                      RC Scripts

                                                                      2
                                                                      T1037.004

                                                                      Create or Modify System Process

                                                                      1
                                                                      T1543

                                                                      Systemd Service

                                                                      1
                                                                      T1543.002

                                                                      Event Triggered Execution

                                                                      1
                                                                      T1546

                                                                      Unix Shell Configuration Modification

                                                                      1
                                                                      T1546.004

                                                                      Hijack Execution Flow

                                                                      1
                                                                      T1574

                                                                      Path Interception by PATH Environment Variable

                                                                      1
                                                                      T1574.007

                                                                      Scheduled Task/Job

                                                                      1
                                                                      T1053

                                                                      Cron

                                                                      1
                                                                      T1053.003

                                                                      Defense Evasion

                                                                      Hijack Execution Flow

                                                                      1
                                                                      T1574

                                                                      Path Interception by PATH Environment Variable

                                                                      1
                                                                      T1574.007

                                                                      Credential Access

                                                                      Adversary-in-the-Middle

                                                                      1
                                                                      T1557

                                                                      OS Credential Dumping

                                                                      1
                                                                      T1003

                                                                      Proc Filesystem

                                                                      1
                                                                      T1003.007

                                                                      Discovery

                                                                      System Information Discovery

                                                                      1
                                                                      T1082

                                                                      System Network Configuration Discovery

                                                                      1
                                                                      T1016

                                                                      Internet Connection Discovery

                                                                      1
                                                                      T1016.001

                                                                      System Network Connections Discovery

                                                                      1
                                                                      T1049

                                                                      Lateral Movement

                                                                      Collection

                                                                      Adversary-in-the-Middle

                                                                      1
                                                                      T1557

                                                                      Command and Control

                                                                      Exfiltration

                                                                      Impact

                                                                      Replay Monitor

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                                                                      Downloads

                                                                      system-service
                                                                      • Path /etc/init.d/system-service
                                                                      • Size 281B
                                                                      • SHA256 6b12b3aebe89a8b83f17aac06db83faacbb3d304071eaa5e0be2360506537750
                                                                      • MD5 SHA1 SHA512 TLSH
                                                                      Submit Download

                                                                      system-service.service
                                                                      • Path /etc/systemd/system/system-service.service
                                                                      • Size 239B
                                                                      • SHA256 d87189495e7b2df9de53f91d04936b0d0ce05d905d437fa956fa444e89c29616
                                                                      • MD5 SHA1 SHA512 TLSH
                                                                      Submit Download

                                                                      .ashrc
                                                                      • Path /root/.ashrc
                                                                      • Size 132B
                                                                      • SHA256 cb4e70c1869ed130f8b46ae08f05d6e19d9219412396589bb082e1e450d3ddb8
                                                                      • MD5 SHA1 SHA512 TLSH
                                                                      Submit Download

                                                                      tmp.rlMmHY
                                                                      • Path /var/spool/cron/crontabs/tmp.rlMmHY
                                                                      • Size 231B
                                                                      • SHA256 6154d290bfe84821796dde290c3fdd582dc2c05f1c3c54e85bbff181522dc1ee
                                                                      • MD5 SHA1 SHA512 TLSH
                                                                      Submit Download

                                                                      sysd
                                                                      • Path /var/tmp/.cache/sysd
                                                                      • Size 274KB
                                                                      • SHA256 a5ca1ca0b96cd88a51372644a03de594a98330e586efb4555c613dad07ca6d5d
                                                                      • MD5 SHA1 SHA512 SSDEEP TLSH
                                                                      Submit Download