Overview

overview

7

Static

static

1

b831ba4a83...b2.elf

debian-12-armhf

7

Analysis

  • max time kernel
    148s
  • max time network
    147s
  • 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
    23/08/2026, 03:58

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General

  • Target
    b831ba4a83379eacb587fe2de298aec3031c8970a23170ede2b57a08060605b2.elf
  • Size 185KB
  • Sample260823-ejkvlaxvas
  • SHA256 ee98a0e1cb51ee3878b3ff67ec9adb74d4664e10c2d5223d0822037391a278cd
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
defense_evasionexecutionpersistenceprivilege_escalation

Malware Config

Signatures

  • Deletes itself 1 IoCs
  • 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
  • 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
  • Changes its process name 1 IoCs

Processes

  • /tmp/b831ba4a83379eacb587fe2de298aec3031c8970a23170ede2b57a08060605b2.elf
    /tmp/b831ba4a83379eacb587fe2de298aec3031c8970a23170ede2b57a08060605b2.elf
    1⤵
    • Deletes itself
    • Creates/modifies environment variables
    • Modifies init.d
    • Modifies rc script
    • Modifies systemd
    • Modifies Bash startup script
    • Changes its process name
    PID:790
    • /bin/sh
      sh -c "crontab -l 2>/dev/null"
      2⤵
        PID:794
        • /usr/bin/crontab
          crontab -l
          3⤵
            PID:798
        • /bin/sh
          sh -c "(crontab -l 2>/dev/null; echo '@reboot /usr/lib/kworker-helper') | crontab - 2>/dev/null"
          2⤵
            PID:803
            • /usr/bin/crontab
              crontab -l
              3⤵
                PID:807
              • /usr/bin/crontab
                crontab -
                3⤵
                • Creates/modifies Cron job
                PID:806
            • /bin/chattr
              chattr +i /etc/systemd/system/kworker-helper.service
              2⤵
                PID:811
            • /bin/chattr
              chattr +i /etc/init.d/kworker-helper
              1⤵
                PID:812
              • /bin/chattr
                chattr +i /usr/lib/kworker-helper
                1⤵
                  PID:810
                • /bin/busybox
                  chattr +i /usr/lib/kworker-helper
                  1⤵
                    PID:813
                  • /bin/busybox
                    chattr +i /etc/init.d/kworker-helper
                    1⤵
                      PID:815
                    • /bin/busybox
                      chattr +i /etc/systemd/system/kworker-helper.service
                      1⤵
                        PID:814

                      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

                            Discovery

                            Lateral Movement

                            Collection

                            Command and Control

                            Exfiltration

                            Impact

                            Replay Monitor

                            Loading Replay Monitor...

                            Downloads

                            kworker-helper
                            • Path /etc/init.d/kworker-helper
                            • Size 379B
                            • SHA256 daeb1a39fa3bf6fad15573d3aba269ac40fd43532bb487be2ed13453756cbe50
                            • MD5 SHA1 SHA512 TLSH
                            Submit Download

                            kworker-helper.service
                            • Path /etc/systemd/system/kworker-helper.service
                            • Size 190B
                            • SHA256 dcc492c83b938187ae12ae6df39f2350a98bb80761d79aa3ad4f29fa9a371c07
                            • MD5 SHA1 SHA512 TLSH
                            Submit Download

                            .ashrc
                            • Path /root/.ashrc
                            • Size 61B
                            • SHA256 30fc62ecc4fde897502efdd4821bd14c60694b758b6664f4044cfd48ca3a2efb
                            • MD5 SHA1 SHA512
                            Submit Download

                            kworker-helper
                            • Path /usr/lib/kworker-helper
                            • Size 185KB
                            • SHA256 ee98a0e1cb51ee3878b3ff67ec9adb74d4664e10c2d5223d0822037391a278cd
                            • MD5 SHA1 SHA512 SSDEEP TLSH
                            Submit Download

                            tmp.FAYEyC
                            • Path /var/spool/cron/crontabs/tmp.FAYEyC
                            • Size 207B
                            • SHA256 f77e74a6fe13d98908612539b8677119de5a98f8798212158f348ff6bf0bc85f
                            • MD5 SHA1 SHA512 TLSH
                            Submit Download