Overview

overview

10

Static

static

10

bash.elf

ubuntu-18.04-amd64

10

Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    ubuntu-18.04_amd64
  • resource
    ubuntu1804-amd64-20260513-en
  • resource tags

    arch:amd64arch:i386image:ubuntu1804-amd64-20260513-enkernel:4.15.0-213-genericlocale:en-usos:ubuntu-18.04-amd64system
  • submitted
    15/09/2026, 06:10

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General

  • Target
    bash.elf
  • Size 88KB
  • Sample260915-gw92csscnc
  • SHA256 7eb420b8676a35cc75e252c37cd1d70fdf1c9f0ce83574696dd2516a293bb28f
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
botnetdefense_evasiondiscoveryexecutiongafgytpersistenceprivilege_escalation

Malware Config

Extracted

Family

  • gafgyt

C2

  • 64.89.160.222:55487

Signatures

  • Family: Gafgyt/Bashlite

    IoT botnet with numerous variants first seen in 2014.

    botnetgafgyt
  • Detected Gafgyt variant 1 IoCs
  • File and Directory Permissions Modification 1 TTPs 2 IoCs

    Adversaries may modify file or directory permissions to evade defenses.

    defense_evasion
  • Creates/modifies Cron job 1 TTPs 5 IoCs

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

    executionpersistenceprivilege_escalation
  • Creates/modifies environment variables 1 TTPs 4 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
  • Reads system routing table 1 TTPs 1 IoCs

    Gets active network interfaces from /proc virtual filesystem.

    discovery
  • 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 4 IoCs
    persistence
  • Changes its process name 2 IoCs
  • Reads system network configuration 1 TTPs 1 IoCs

    Uses contents of /proc filesystem to enumerate network settings.

    discovery
  • Reads runtime system information 64 IoCs

    Reads data from /proc virtual filesystem.

    discovery
  • Writes file to tmp directory 1 IoCs

    Malware often drops required files in the /tmp directory.

Processes

  • /tmp/bash.elf
    /tmp/bash.elf
    1⤵
    • Creates/modifies Cron job
    • Creates/modifies environment variables
    • Modifies init.d
    • Modifies rc script
    • Modifies systemd
    • Reads system routing table
    • Modifies Bash startup script
    • Changes its process name
    • Reads system network configuration
    • Reads runtime system information
    PID:1512
    • /bin/sh
      sh -c "/usr/sbin/update-rc.d bot defaults 2>/dev/null"
      2⤵
        PID:1515
        • /usr/sbin/update-rc.d
          /usr/sbin/update-rc.d bot defaults
          3⤵
            PID:1516
            • /usr/local/sbin/systemctl
              systemctl daemon-reload
              4⤵
                PID:1517
              • /usr/local/bin/systemctl
                systemctl daemon-reload
                4⤵
                  PID:1517
                • /usr/sbin/systemctl
                  systemctl daemon-reload
                  4⤵
                    PID:1517
                  • /usr/bin/systemctl
                    systemctl daemon-reload
                    4⤵
                      PID:1517
                    • /sbin/systemctl
                      systemctl daemon-reload
                      4⤵
                        PID:1517
                      • /bin/systemctl
                        systemctl daemon-reload
                        4⤵
                        • Reads runtime system information
                        PID:1517
                  • /bin/sh
                    sh -c "/sbin/chkconfig --add bot 2>/dev/null"
                    2⤵
                      PID:1546
                      • /sbin/chkconfig
                        /sbin/chkconfig --add bot
                        3⤵
                          PID:1547
                      • /bin/sh
                        sh -c "systemctl enable bot.service 2>/dev/null"
                        2⤵
                          PID:1548
                          • /bin/systemctl
                            systemctl enable bot.service
                            3⤵
                            • Changes its process name
                            • Reads runtime system information
                            PID:1549
                            • /lib/systemd/systemd-sysv-install
                              /lib/systemd/systemd-sysv-install enable bot
                              4⤵
                                PID:1550
                                • /usr/bin/getopt
                                  getopt -o r: --long root: -- enable bot
                                  5⤵
                                    PID:1551
                                  • /usr/sbin/update-rc.d
                                    /usr/sbin/update-rc.d bot defaults
                                    5⤵
                                      PID:1552
                                      • /usr/local/sbin/systemctl
                                        systemctl daemon-reload
                                        6⤵
                                          PID:1553
                                        • /usr/local/bin/systemctl
                                          systemctl daemon-reload
                                          6⤵
                                            PID:1553
                                          • /usr/sbin/systemctl
                                            systemctl daemon-reload
                                            6⤵
                                              PID:1553
                                            • /usr/bin/systemctl
                                              systemctl daemon-reload
                                              6⤵
                                                PID:1553
                                              • /sbin/systemctl
                                                systemctl daemon-reload
                                                6⤵
                                                  PID:1553
                                                • /bin/systemctl
                                                  systemctl daemon-reload
                                                  6⤵
                                                  • Reads runtime system information
                                                  PID:1553
                                              • /usr/sbin/update-rc.d
                                                /usr/sbin/update-rc.d bot enable
                                                5⤵
                                                  PID:1574
                                                  • /usr/local/sbin/systemctl
                                                    systemctl daemon-reload
                                                    6⤵
                                                      PID:1576
                                                    • /usr/local/bin/systemctl
                                                      systemctl daemon-reload
                                                      6⤵
                                                        PID:1576
                                                      • /usr/sbin/systemctl
                                                        systemctl daemon-reload
                                                        6⤵
                                                          PID:1576
                                                        • /usr/bin/systemctl
                                                          systemctl daemon-reload
                                                          6⤵
                                                            PID:1576
                                                          • /sbin/systemctl
                                                            systemctl daemon-reload
                                                            6⤵
                                                              PID:1576
                                                            • /bin/systemctl
                                                              systemctl daemon-reload
                                                              6⤵
                                                              • Reads runtime system information
                                                              PID:1576
                                                    • /bin/sh
                                                      sh -c "echo \"/tmp/bash.elf\" | at now + 1 minute 2>/dev/null"
                                                      2⤵
                                                        PID:1617
                                                        • /usr/bin/at
                                                          at now + 1 minute
                                                          3⤵
                                                          • Creates/modifies Cron job
                                                          • Schedules an At job
                                                          • Reads runtime system information
                                                          PID:1619
                                                      • /bin/sh
                                                        sh -c "cp /tmp/bash.elf /tmp/.kworker 2>/dev/null; chmod 755 /tmp/.kworker 2>/dev/null"
                                                        2⤵
                                                        • File and Directory Permissions Modification
                                                        PID:1620
                                                        • /bin/cp
                                                          cp /tmp/bash.elf /tmp/.kworker
                                                          3⤵
                                                          • Reads runtime system information
                                                          • Writes file to tmp directory
                                                          PID:1621
                                                        • /bin/chmod
                                                          chmod 755 /tmp/.kworker
                                                          3⤵
                                                          • File and Directory Permissions Modification
                                                          PID:1622

                                                    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

                                                          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

                                                          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

                                                          1
                                                          T1574

                                                          Path Interception by PATH Environment Variable

                                                          1
                                                          T1574.007

                                                          Scheduled Task/Job

                                                          2
                                                          T1053

                                                          At

                                                          1
                                                          T1053.002

                                                          Cron

                                                          1
                                                          T1053.003

                                                          Defense Evasion

                                                          File and Directory Permissions Modification

                                                          1
                                                          T1222

                                                          Linux and Mac File and Directory Permissions Modification

                                                          1
                                                          T1222.002

                                                          Hijack Execution Flow

                                                          1
                                                          T1574

                                                          Path Interception by PATH Environment Variable

                                                          1
                                                          T1574.007

                                                          Credential Access

                                                          Discovery

                                                          System Network Configuration Discovery

                                                          2
                                                          T1016

                                                          Internet Connection Discovery

                                                          2
                                                          T1016.001

                                                          Lateral Movement

                                                          Collection

                                                          Command and Control

                                                          Exfiltration

                                                          Impact

                                                          Replay Monitor

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                                                          Downloads

                                                          root
                                                          • Path /etc/cron.d/root
                                                          • Size 47B
                                                          • SHA256 c88ea3860096f5cd7055fe40623650fea8d816d9c1c48fb59cf1446b6284a5fb
                                                          • MD5 SHA1 SHA512
                                                          Submit Download

                                                          S99bot
                                                          • Path /etc/init.d/S99bot
                                                          • Size 82B
                                                          • SHA256 41dda35d0890a2f3c8fd444f9261a786e4fae64fa1c5ab877795e81accbb9857
                                                          • MD5 SHA1 SHA512 TLSH
                                                          Submit Download

                                                          bot
                                                          • Path /etc/init.d/bot
                                                          • Size 212B
                                                          • SHA256 2ec6941247a8c08a1dd7b43c06e1acf6ec8061c1e173d087e9cfa3dc43fdf157
                                                          • MD5 SHA1 SHA512 TLSH
                                                          Submit Download

                                                          bot.sh
                                                          • Path /etc/profile.d/bot.sh
                                                          • Size 44B
                                                          • SHA256 7c2ea42d5ddf05e66b82e9f73cd19c48f0537cd455371aebaf1c19f4eef3e36d
                                                          • MD5 SHA1 SHA512
                                                          Submit Download

                                                          rc.local
                                                          • Path /etc/rc.local
                                                          • Size 16B
                                                          • SHA256 2d6135d61f7653c351fceedecee4de747c2b16c31fb652bf2d8bd33b85f4d16b
                                                          • MD5 SHA1 SHA512
                                                          Submit Download

                                                          bot.service
                                                          • Path /etc/systemd/system/bot.service
                                                          • Size 172B
                                                          • SHA256 58953975b936aa6358da491074cb4d94cca3ba8cf30716491d72f59b8359cf8e
                                                          • MD5 SHA1 SHA512 TLSH
                                                          Submit Download

                                                          .bash_profile
                                                          • Path /root/.bash_profile
                                                          • Size 35B
                                                          • SHA256 457cbc1f01d3875f8fa4bdd025c83d17eb635ecf2ba67448c36eca0e8defb105
                                                          • MD5 SHA1 SHA512
                                                          Submit Download

                                                          .kworker
                                                          • Path /tmp/.kworker
                                                          • Size 88KB
                                                          • SHA256 7eb420b8676a35cc75e252c37cd1d70fdf1c9f0ce83574696dd2516a293bb28f
                                                          • MD5 SHA1 SHA512 SSDEEP TLSH
                                                          Submit Download

                                                          a0000101c714d3
                                                          • Path /var/spool/cron/atjobs/a0000101c714d3
                                                          • Size 387B
                                                          • SHA256 e49638259d400b2d8f9cd2350897e53be375827e4782eef5dcda1b9b3aac7dff
                                                          • MD5 SHA1 SHA512 TLSH
                                                          Submit Download

                                                          root
                                                          • Path /var/spool/cron/crontabs/root
                                                          • Size 42B
                                                          • SHA256 9550c9b690d72e201a51901e54bc76ff5de177eaff8ca9d117118c1527959a58
                                                          • MD5 SHA1 SHA512
                                                          Submit Download