Overview

overview

9

Static

static

5

ntb.arm7.elf

debian-12-armhf

9

Analysis

  • max time kernel
    150s
  • max time network
    144s
  • 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
    08/08/2026, 18:00

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General

  • Target
    ntb.arm7.elf
  • Size 99KB
  • Sample260808-wlsrnabl9v
  • SHA256 75ba2cc4707db9c5b1813ad7beaef10834ae7676c52ed3687eb75ada0ee86c30
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
9/10
antivmdefense_evasiondiscoveryexectionexecutionpersistenceprivilege_escalationupx

Malware Config

Signatures

  • Modifies the dynamic linker configuration file 2 TTPs 1 IoCs

    Malware can modify the configuration file of the dynamic linker to preload malicous libraries with every executed process.

    exectionpersistenceprivilege_escalationdefense_evasion
  • Executes dropped EXE 2 IoCs
  • Creates/modifies Cron job 1 TTPs 4 IoCs

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

    executionpersistenceprivilege_escalation
  • Creates/modifies environment variables 1 TTPs 2 IoCs

    Creating/modifying environment variables is a common persistence mechanism.

    persistenceprivilege_escalationdefense_evasion
  • Enumerates running processes

    Discovers information about currently running processes on the system

  • Modifies init.d 2 TTPs 2 IoCs

    Adds/modifies system service, likely for persistence.

    persistence
  • Modifies rc script 2 TTPs 2 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
  • Schedules an At job 1 TTPs 1 IoCs

    Schedules a job to be run using the at command.

    executionpersistenceprivilege_escalation
  • Modifies Bash startup script 2 TTPs 2 IoCs
    persistence
  • UPX packed file 1 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

    upx
  • Changes its process name 2 IoCs
  • Checks CPU configuration 1 TTPs 1 IoCs

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

    antivm
  • Reads runtime system information 64 IoCs

    Reads data from /proc virtual filesystem.

    discovery
  • Writes file to shm directory 1 IoCs

    Malware can drop malicious files in the shm directory which will run directly from RAM.

  • Writes file to tmp directory 2 IoCs

    Malware often drops required files in the /tmp directory.

Processes

  • /tmp/ntb.arm7.elf
    /tmp/ntb.arm7.elf
    1⤵
    • Modifies the dynamic linker configuration file
    • Creates/modifies Cron job
    • Creates/modifies environment variables
    • Modifies init.d
    • Modifies rc script
    • Modifies systemd
    • Modifies Bash startup script
    • Changes its process name
    • Checks CPU configuration
    • Reads runtime system information
    • Writes file to shm directory
    • Writes file to tmp directory
    PID:802
    • /bin/sh
      sh -c "systemctl daemon-reload 2>/dev/null"
      2⤵
        PID:828
        • /usr/bin/systemctl
          systemctl daemon-reload
          3⤵
          • Reads runtime system information
          PID:830
      • /bin/sh
        sh -c "systemctl enable resolver-helper.service 2>/dev/null"
        2⤵
          PID:880
          • /usr/bin/systemctl
            systemctl enable resolver-helper.service
            3⤵
            • Reads runtime system information
            PID:881
        • /bin/sh
          sh -c "systemctl start resolver-helper.service 2>/dev/null"
          2⤵
            PID:899
            • /usr/bin/systemctl
              systemctl start resolver-helper.service
              3⤵
              • Reads runtime system information
              PID:901
          • /bin/sh
            sh -c "update-rc.d syshelper defaults 2>/dev/null"
            2⤵
              PID:903
              • /usr/sbin/update-rc.d
                update-rc.d syshelper defaults
                3⤵
                  PID:904
                  • /usr/local/sbin/systemctl
                    systemctl daemon-reload
                    4⤵
                      PID:905
                    • /usr/local/bin/systemctl
                      systemctl daemon-reload
                      4⤵
                        PID:905
                      • /usr/sbin/systemctl
                        systemctl daemon-reload
                        4⤵
                          PID:905
                        • /usr/bin/systemctl
                          systemctl daemon-reload
                          4⤵
                          • Reads runtime system information
                          PID:905
                    • /bin/sh
                      sh -c "chkconfig --add syshelper 2>/dev/null"
                      2⤵
                        PID:923
                      • /bin/sh
                        sh -c "chkconfig syshelper on 2>/dev/null"
                        2⤵
                          PID:924
                        • /bin/sh
                          sh -c "/etc/init.d/syshelper start 2>/dev/null"
                          2⤵
                          • Executes dropped EXE
                          PID:925
                          • /etc/init.d/syshelper
                            /etc/init.d/syshelper start
                            3⤵
                            • Executes dropped EXE
                            PID:926
                        • /bin/sh
                          sh -c "echo '/tmp/.sys unknown' | at now + 1 minute 2>/dev/null"
                          2⤵
                            PID:928
                            • /usr/bin/at
                              at now + 1 minute
                              3⤵
                              • Creates/modifies Cron job
                              • Schedules an At job
                              • Reads runtime system information
                              PID:930
                        • /tmp/.sys
                          /tmp/.sys unknown
                          1⤵
                          • Reads runtime system information
                          PID:927

                        Network

                              MITRE ATT&CK Enterprise v16

                              Reconnaissance

                              Resource Development

                              Initial Access

                              Execution

                              Scheduled Task/Job

                              2
                              T1053

                              At

                              1
                              T1053.002

                              Cron

                              1
                              T1053.003

                              Shared Modules

                              1
                              T1129

                              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

                              2
                              T1574

                              Dynamic Linker Hijacking

                              1
                              T1574.006

                              Path Interception by PATH Environment Variable

                              1
                              T1574.007

                              Scheduled Task/Job

                              2
                              T1053

                              At

                              1
                              T1053.002

                              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

                              2
                              T1574

                              Dynamic Linker Hijacking

                              1
                              T1574.006

                              Path Interception by PATH Environment Variable

                              1
                              T1574.007

                              Scheduled Task/Job

                              2
                              T1053

                              At

                              1
                              T1053.002

                              Cron

                              1
                              T1053.003

                              Defense Evasion

                              Hijack Execution Flow

                              2
                              T1574

                              Dynamic Linker Hijacking

                              1
                              T1574.006

                              Path Interception by PATH Environment Variable

                              1
                              T1574.007

                              Virtualization/Sandbox Evasion

                              1
                              T1497

                              System Checks

                              1
                              T1497.001

                              Credential Access

                              Discovery

                              Virtualization/Sandbox Evasion

                              1
                              T1497

                              System Checks

                              1
                              T1497.001

                              Lateral Movement

                              Collection

                              Command and Control

                              Exfiltration

                              Impact

                              Replay Monitor

                              Loading Replay Monitor...

                              Downloads

                              rcS
                              • Path /etc/init.d/rcS
                              • Size 21B
                              • SHA256 d2ba62c5dfead9118eeb89c22c3e4c38b6494407c4c976e487664ea6352368df
                              • MD5 SHA1 SHA512
                              Submit Download

                              syshelper
                              • Path /etc/init.d/syshelper
                              • Size 409B
                              • SHA256 006e687bfbef0854e7c4a59c9c78b87c470e25badfdcb4c3ed2382c5d61b5e90
                              • MD5 SHA1 SHA512 TLSH
                              Submit Download

                              inittab
                              • Path /etc/inittab
                              • Size 29B
                              • SHA256 1d896113670eaf02603a5165f93fdf963a548f181dc06357b1a038a722a56972
                              • MD5 SHA1 SHA512
                              Submit Download

                              syshelper.sh
                              • Path /etc/profile.d/syshelper.sh
                              • Size 30B
                              • SHA256 2757007b591de047b3436ea483e340a301f41807479ddb267a32f42b695f8dd1
                              • MD5 SHA1 SHA512
                              Submit Download

                              resolver-helper.service
                              • Path /etc/systemd/system/resolver-helper.service
                              • Size 162B
                              • SHA256 54fb322ff7f0b3bae4ace80f06c02c42231238ec41ac7e722cd86ffcda6e4a1c
                              • MD5 SHA1 SHA512 TLSH
                              Submit Download

                              .name
                              • Path /tmp/.name
                              • Size 8B
                              • SHA256 753f70a79e3ef632fdba038c083d27582b7824e012ab4b2e8871abc9cb68adb4
                              • MD5 SHA1 SHA512
                              Submit Download

                              .sys
                              • Path /tmp/.sys
                              • Size 99KB
                              • SHA256 75ba2cc4707db9c5b1813ad7beaef10834ae7676c52ed3687eb75ada0ee86c30
                              • MD5 SHA1 SHA512 SSDEEP TLSH
                              Submit Download

                              a0000101c641da
                              • Path /var/spool/cron/atjobs/a0000101c641da
                              • Size 427B
                              • SHA256 a7a990893927694eccf7afd772287ecba31d46c4d33c7f3c1e1606c6964c1db5
                              • MD5 SHA1 SHA512 TLSH
                              Submit Download

                              root
                              • Path /var/spool/cron/crontabs/root
                              • Size 47B
                              • SHA256 fd48d43a55451a39aea34e389f01289760d138675bfeee7fa2b94593da3966f6
                              • MD5 SHA1 SHA512
                              Submit Download