Overview

overview

7

Static

static

1

arm5.elf

debian-12-armhf

7

Analysis

  • max time kernel
    29s
  • max time network
    142s
  • 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
    25/09/2026, 22:54

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General

  • Target
    arm5.elf
  • Size 250KB
  • Sample260925-2vmvnaydle
  • SHA256 37f65cc49edad552f1ba17c024927f8448e721284cacf7e2e09eed12289ea7e8
  • 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 64 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
  • System Network Configuration Discovery 1 TTPs 5 IoCs

    Adversaries may gather information about the network configuration of a system.

    discovery

Processes

  • /tmp/arm5.elf
    /tmp/arm5.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:788
    • /bin/sh
      sh -c "systemctl daemon-reload 2>/dev/null"
      2⤵
        PID:798
        • /usr/bin/systemctl
          systemctl daemon-reload
          3⤵
            PID:803
        • /bin/sh
          sh -c "killall -9 sshd 2>/dev/null"
          2⤵
            PID:825
          • /bin/sh
            sh -c "killall -9 telnetd 2>/dev/null"
            2⤵
              PID:826
            • /bin/sh
              sh -c "killall -9 dropbear 2>/dev/null"
              2⤵
                PID:827
              • /bin/sh
                sh -c "killall -9 in.telnetd 2>/dev/null"
                2⤵
                  PID:828
                • /bin/sh
                  sh -c "killall -9 lighttpd 2>/dev/null"
                  2⤵
                    PID:829
                  • /bin/sh
                    sh -c "killall -9 nginx 2>/dev/null"
                    2⤵
                      PID:830
                    • /bin/sh
                      sh -c "killall -9 apache2 2>/dev/null"
                      2⤵
                        PID:831
                      • /bin/sh
                        sh -c "killall -9 httpd 2>/dev/null"
                        2⤵
                          PID:832
                        • /bin/sh
                          sh -c "iptables -F 2>/dev/null"
                          2⤵
                          • System Network Configuration Discovery
                          PID:833
                        • /bin/sh
                          sh -c "iptables -X 2>/dev/null"
                          2⤵
                          • System Network Configuration Discovery
                          PID:834
                        • /bin/sh
                          sh -c "iptables -t nat -F 2>/dev/null"
                          2⤵
                          • System Network Configuration Discovery
                          PID:835
                        • /bin/sh
                          sh -c "ip6tables -F 2>/dev/null"
                          2⤵
                          • System Network Configuration Discovery
                          PID:836
                        • /bin/sh
                          sh -c "ip6tables -X 2>/dev/null"
                          2⤵
                          • System Network Configuration Discovery
                          PID:837
                        • /bin/sh
                          sh -c "systemctl enable system-service 2>/dev/null"
                          2⤵
                            PID:838
                            • /usr/bin/systemctl
                              systemctl enable system-service
                              3⤵
                                PID:839
                            • /bin/chattr
                              chattr +ia /var/tmp/.cache/sysd
                              2⤵
                                PID:840
                              • /bin/sh
                                sh -c "update-rc.d system-service defaults 2>/dev/null"
                                2⤵
                                  PID:863
                                  • /usr/sbin/update-rc.d
                                    update-rc.d system-service defaults
                                    3⤵
                                      PID:864
                                      • /usr/local/sbin/systemctl
                                        systemctl daemon-reload
                                        4⤵
                                          PID:865
                                        • /usr/local/bin/systemctl
                                          systemctl daemon-reload
                                          4⤵
                                            PID:865
                                          • /usr/sbin/systemctl
                                            systemctl daemon-reload
                                            4⤵
                                              PID:865
                                            • /usr/bin/systemctl
                                              systemctl daemon-reload
                                              4⤵
                                                PID:865
                                          • /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:881
                                            • /bin/sh
                                              sh -c "crontab -l 2>/dev/null"
                                              2⤵
                                                PID:882
                                                • /usr/bin/crontab
                                                  crontab -l
                                                  3⤵
                                                    PID:883
                                                • /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:884
                                                    • /usr/bin/crontab
                                                      crontab -
                                                      3⤵
                                                      • Creates/modifies Cron job
                                                      PID:886
                                                    • /usr/bin/crontab
                                                      crontab -l
                                                      3⤵
                                                        PID:887
                                                  • /bin/chattr
                                                    chattr +ia /etc/systemd/system/system-service.service
                                                    1⤵
                                                      PID:842
                                                    • /bin/busybox
                                                      chattr +ia /etc/systemd/system/system-service.service
                                                      1⤵
                                                        PID:843
                                                      • /bin/busybox
                                                        chattr +ia /var/tmp/.cache/sysd
                                                        1⤵
                                                          PID:841

                                                        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

                                                              2
                                                              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.Xv7IB5
                                                              • Path /var/spool/cron/crontabs/tmp.Xv7IB5
                                                              • Size 231B
                                                              • SHA256 7de91b7ab1c24278c50de224eea18dacc41ebed3fb259e18847d50b9cc15b6f0
                                                              • MD5 SHA1 SHA512 TLSH
                                                              Submit Download

                                                              sysd
                                                              • Path /var/tmp/.cache/sysd
                                                              • Size 250KB
                                                              • SHA256 37f65cc49edad552f1ba17c024927f8448e721284cacf7e2e09eed12289ea7e8
                                                              • MD5 SHA1 SHA512 SSDEEP TLSH
                                                              Submit Download