Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    debian-9_armhf
  • resource
    debian9-armhf-20240611-en
  • resource tags

    arch:armhfimage:debian9-armhf-20240611-enkernel:4.9.0-13-armmp-lpaelocale:en-usos:debian-9-armhfsystem
  • submitted
    08-11-2024 09:23

General

  • Target

    linux_arm6.elf

  • Size

    5.1MB

  • MD5

    86bb8faea996492c43f67dbe4c0f3bd7

  • SHA1

    0c2e3cc38c1770fe65ca4a28feb254fdbbe5d5b1

  • SHA256

    c2110e85ca4b04d8b191823d74c7b89d2ac1c339340df25c4bc23a1ef8cb55a5

  • SHA512

    dda73408ff0d14050d23b7e9eb732599de018dd16d9e603812e0d17811847790e0fbde1fcacdd0f21c7df9af223081e10b1471d74172c8a99322045c813736ff

  • SSDEEP

    98304:8cSBHdgN2a7JP97kJru8cYWPAXqWu+60:8cS03eu+6

Malware Config

Extracted

Family

kaiji

C2

154.201.84.237:7850

Signatures

  • Kaiji 1 IoCs

    Kaiji payload

  • Kaiji family
  • kaiji_chaosbot 1 IoCs

    Chaos-variant payload

  • Executes dropped EXE 7 IoCs
  • Modifies Watchdog functionality 1 TTPs 2 IoCs

    Malware like Mirai modifies the Watchdog to prevent it restarting an infected system.

  • Creates/modifies Cron job 1 TTPs 1 IoCs

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

  • Creates/modifies environment variables 1 TTPs 3 IoCs

    Creating/modifying environment variables is a common persistence mechanism.

  • 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.

  • Write file to user bin folder 1 IoCs
  • Modifies Bash startup script 2 TTPs 3 IoCs
  • Changes its process name 1 IoCs
  • Reads CPU attributes 1 TTPs 2 IoCs
  • Enumerates kernel/hardware configuration 1 TTPs 20 IoCs

    Reads contents of /sys virtual filesystem to enumerate system information.

  • Reads runtime system information 64 IoCs

    Reads data from /proc virtual filesystem.

Processes

  • /tmp/linux_arm6.elf
    /tmp/linux_arm6.elf
    1⤵
    • Enumerates kernel/hardware configuration
    PID:658
    • /bin/sh
      sh -c "/etc/32678&"
      2⤵
        PID:679
      • /usr/sbin/service
        service crond start
        2⤵
          PID:680
          • /usr/bin/basename
            basename /usr/sbin/service
            3⤵
              PID:683
            • /usr/bin/basename
              basename /usr/sbin/service
              3⤵
                PID:687
              • /bin/systemctl
                systemctl --quiet is-active multi-user.target
                3⤵
                • Enumerates kernel/hardware configuration
                • Reads runtime system information
                PID:692
              • /bin/systemctl
                systemctl list-unit-files --full "--type=socket"
                3⤵
                • Enumerates kernel/hardware configuration
                • Reads runtime system information
                PID:703
              • /bin/sed
                sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                3⤵
                • Reads runtime system information
                PID:704
            • /tmp/linux_arm6.elf
              /tmp/linux_arm6.elf " "
              2⤵
              • Modifies Watchdog functionality
              • Creates/modifies environment variables
              • Modifies init.d
              • Write file to user bin folder
              • Modifies Bash startup script
              • Changes its process name
              • Enumerates kernel/hardware configuration
              • Reads runtime system information
              PID:681
              • /usr/sbin/update-rc.d
                update-rc.d linux_kill defaults
                3⤵
                  PID:700
                  • /usr/local/sbin/systemctl
                    systemctl daemon-reload
                    4⤵
                      PID:708
                    • /usr/local/bin/systemctl
                      systemctl daemon-reload
                      4⤵
                        PID:708
                      • /usr/sbin/systemctl
                        systemctl daemon-reload
                        4⤵
                          PID:708
                        • /usr/bin/systemctl
                          systemctl daemon-reload
                          4⤵
                            PID:708
                          • /sbin/systemctl
                            systemctl daemon-reload
                            4⤵
                              PID:708
                            • /bin/systemctl
                              systemctl daemon-reload
                              4⤵
                              • Enumerates kernel/hardware configuration
                              • Reads runtime system information
                              PID:708
                          • /bin/bash
                            bash -c "echo \"*/1 * * * * root /.img \" >> /etc/crontab"
                            3⤵
                            • Creates/modifies Cron job
                            PID:714
                          • /usr/bin/renice
                            renice -20 681
                            3⤵
                              PID:719
                            • /bin/mount
                              mount -o bind /tmp/ /proc/681
                              3⤵
                                PID:720
                              • /usr/sbin/service
                                service cron start
                                3⤵
                                  PID:722
                                  • /usr/bin/basename
                                    basename /usr/sbin/service
                                    4⤵
                                      PID:723
                                    • /usr/bin/basename
                                      basename /usr/sbin/service
                                      4⤵
                                        PID:725
                                      • /bin/systemctl
                                        systemctl --quiet is-active multi-user.target
                                        4⤵
                                        • Enumerates kernel/hardware configuration
                                        • Reads runtime system information
                                        PID:726
                                      • /bin/systemctl
                                        systemctl list-unit-files --full "--type=socket"
                                        4⤵
                                        • Enumerates kernel/hardware configuration
                                        • Reads runtime system information
                                        PID:728
                                      • /bin/sed
                                        sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                        4⤵
                                          PID:729
                                      • /usr/local/sbin/systemctl
                                        systemctl "--job-mode=ignore-dependencies" start cron.service
                                        3⤵
                                          PID:722
                                        • /usr/local/bin/systemctl
                                          systemctl "--job-mode=ignore-dependencies" start cron.service
                                          3⤵
                                            PID:722
                                          • /usr/sbin/systemctl
                                            systemctl "--job-mode=ignore-dependencies" start cron.service
                                            3⤵
                                              PID:722
                                            • /usr/bin/systemctl
                                              systemctl "--job-mode=ignore-dependencies" start cron.service
                                              3⤵
                                                PID:722
                                              • /sbin/systemctl
                                                systemctl "--job-mode=ignore-dependencies" start cron.service
                                                3⤵
                                                  PID:722
                                                • /bin/systemctl
                                                  systemctl "--job-mode=ignore-dependencies" start cron.service
                                                  3⤵
                                                  • Enumerates kernel/hardware configuration
                                                  • Reads runtime system information
                                                  PID:722
                                                • /bin/systemctl
                                                  systemctl start crond.service
                                                  3⤵
                                                  • Enumerates kernel/hardware configuration
                                                  PID:732
                                            • /etc/32678
                                              /etc/32678
                                              1⤵
                                              • Executes dropped EXE
                                              PID:684
                                              • /bin/sleep
                                                sleep 60
                                                2⤵
                                                  PID:686
                                                • /etc/id.services.conf
                                                  /etc/id.services.conf
                                                  2⤵
                                                  • Executes dropped EXE
                                                  • Enumerates kernel/hardware configuration
                                                  PID:828
                                                  • /usr/bin/pkill
                                                    pkill -9 32678
                                                    3⤵
                                                    • Reads CPU attributes
                                                    • Reads runtime system information
                                                    PID:832
                                                  • /bin/sh
                                                    sh -c "/etc/32678&"
                                                    3⤵
                                                      PID:833
                                                    • /usr/sbin/service
                                                      service crond start
                                                      3⤵
                                                        PID:834
                                                        • /usr/bin/basename
                                                          basename /usr/sbin/service
                                                          4⤵
                                                            PID:837
                                                          • /usr/bin/basename
                                                            basename /usr/sbin/service
                                                            4⤵
                                                              PID:842
                                                            • /bin/systemctl
                                                              systemctl --quiet is-active multi-user.target
                                                              4⤵
                                                              • Enumerates kernel/hardware configuration
                                                              • Reads runtime system information
                                                              PID:843
                                                            • /bin/systemctl
                                                              systemctl list-unit-files --full "--type=socket"
                                                              4⤵
                                                              • Enumerates kernel/hardware configuration
                                                              PID:845
                                                            • /bin/sed
                                                              sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                                              4⤵
                                                                PID:846
                                                            • /etc/id.services.conf
                                                              /etc/id.services.conf " "
                                                              3⤵
                                                              • Executes dropped EXE
                                                              • Enumerates kernel/hardware configuration
                                                              PID:835
                                                        • /usr/local/sbin/systemctl
                                                          systemctl "--job-mode=ignore-dependencies" start crond.service
                                                          1⤵
                                                            PID:680
                                                          • /usr/local/bin/systemctl
                                                            systemctl "--job-mode=ignore-dependencies" start crond.service
                                                            1⤵
                                                              PID:680
                                                            • /usr/sbin/systemctl
                                                              systemctl "--job-mode=ignore-dependencies" start crond.service
                                                              1⤵
                                                                PID:680
                                                              • /usr/bin/systemctl
                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                1⤵
                                                                  PID:680
                                                                • /sbin/systemctl
                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                  1⤵
                                                                    PID:680
                                                                  • /bin/systemctl
                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                    1⤵
                                                                    • Enumerates kernel/hardware configuration
                                                                    PID:680
                                                                  • /etc/32678
                                                                    /etc/32678
                                                                    1⤵
                                                                    • Executes dropped EXE
                                                                    PID:836
                                                                    • /bin/sleep
                                                                      sleep 60
                                                                      2⤵
                                                                        PID:838
                                                                      • /etc/id.services.conf
                                                                        /etc/id.services.conf
                                                                        2⤵
                                                                        • Executes dropped EXE
                                                                        • Enumerates kernel/hardware configuration
                                                                        PID:864
                                                                        • /usr/bin/pkill
                                                                          pkill -9 32678
                                                                          3⤵
                                                                          • Reads CPU attributes
                                                                          • Reads runtime system information
                                                                          PID:868
                                                                        • /bin/sh
                                                                          sh -c "/etc/32678&"
                                                                          3⤵
                                                                            PID:869
                                                                          • /usr/sbin/service
                                                                            service crond start
                                                                            3⤵
                                                                              PID:870
                                                                              • /usr/bin/basename
                                                                                basename /usr/sbin/service
                                                                                4⤵
                                                                                  PID:873
                                                                                • /usr/bin/basename
                                                                                  basename /usr/sbin/service
                                                                                  4⤵
                                                                                    PID:877
                                                                                  • /bin/systemctl
                                                                                    systemctl --quiet is-active multi-user.target
                                                                                    4⤵
                                                                                    • Enumerates kernel/hardware configuration
                                                                                    PID:881
                                                                                  • /bin/sed
                                                                                    sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                                                                    4⤵
                                                                                      PID:884
                                                                                    • /bin/systemctl
                                                                                      systemctl list-unit-files --full "--type=socket"
                                                                                      4⤵
                                                                                      • Enumerates kernel/hardware configuration
                                                                                      • Reads runtime system information
                                                                                      PID:883
                                                                                  • /etc/id.services.conf
                                                                                    /etc/id.services.conf " "
                                                                                    3⤵
                                                                                    • Executes dropped EXE
                                                                                    • Enumerates kernel/hardware configuration
                                                                                    PID:871
                                                                              • /usr/local/sbin/systemctl
                                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                1⤵
                                                                                  PID:834
                                                                                • /usr/local/bin/systemctl
                                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                  1⤵
                                                                                    PID:834
                                                                                  • /usr/sbin/systemctl
                                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                    1⤵
                                                                                      PID:834
                                                                                    • /usr/bin/systemctl
                                                                                      systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                      1⤵
                                                                                        PID:834
                                                                                      • /sbin/systemctl
                                                                                        systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                        1⤵
                                                                                          PID:834
                                                                                        • /bin/systemctl
                                                                                          systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                          1⤵
                                                                                          • Enumerates kernel/hardware configuration
                                                                                          • Reads runtime system information
                                                                                          PID:834
                                                                                        • /etc/32678
                                                                                          /etc/32678
                                                                                          1⤵
                                                                                          • Executes dropped EXE
                                                                                          PID:872
                                                                                          • /bin/sleep
                                                                                            sleep 60
                                                                                            2⤵
                                                                                              PID:875
                                                                                          • /usr/local/sbin/systemctl
                                                                                            systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                            1⤵
                                                                                              PID:870
                                                                                            • /usr/local/bin/systemctl
                                                                                              systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                              1⤵
                                                                                                PID:870
                                                                                              • /usr/sbin/systemctl
                                                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                1⤵
                                                                                                  PID:870
                                                                                                • /usr/bin/systemctl
                                                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                  1⤵
                                                                                                    PID:870
                                                                                                  • /sbin/systemctl
                                                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                    1⤵
                                                                                                      PID:870
                                                                                                    • /bin/systemctl
                                                                                                      systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                      1⤵
                                                                                                      • Enumerates kernel/hardware configuration
                                                                                                      PID:870

                                                                                                    Network

                                                                                                    MITRE ATT&CK Enterprise v15

                                                                                                    Replay Monitor

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                                                                                                    Downloads

                                                                                                    • /.img

                                                                                                      Filesize

                                                                                                      33B

                                                                                                      MD5

                                                                                                      d73d3376908ea075a939e3871ad0fabe

                                                                                                      SHA1

                                                                                                      320ff65831247ba199515f1b94df26cc8a3e5f76

                                                                                                      SHA256

                                                                                                      edbdabe30d8236a2c0a4eb89dfd597552130e4c1a4e93f8fe1568920442ad73a

                                                                                                      SHA512

                                                                                                      57b83fef88620598beb5d65626bf757d0abef242d2d6a01796a61474dedc5095a4a9d0f292b6abb450cad3d4410ab8456253600f58ddb66cfe6d79e1c8415536

                                                                                                    • /etc/32678

                                                                                                      Filesize

                                                                                                      61B

                                                                                                      MD5

                                                                                                      768eaf287796da19e1cf5e0b2fb1b161

                                                                                                      SHA1

                                                                                                      6a1ce2ee5ccc86d1f33806feb14547b35290df2a

                                                                                                      SHA256

                                                                                                      1d22620dfb2a6715e5d745aed5cf841ede0e75e1747f12b9b925a2d346bc7ecb

                                                                                                      SHA512

                                                                                                      e6af30c9df4f7f47696069511e64ecbc8e841629d692ee4056503df3533fb7a7a74960698826260355e1dba7b6c562482a27a39bb51a4237473ce4b68472d620

                                                                                                    • /etc/id.services.conf

                                                                                                      Filesize

                                                                                                      5.1MB

                                                                                                      MD5

                                                                                                      86bb8faea996492c43f67dbe4c0f3bd7

                                                                                                      SHA1

                                                                                                      0c2e3cc38c1770fe65ca4a28feb254fdbbe5d5b1

                                                                                                      SHA256

                                                                                                      c2110e85ca4b04d8b191823d74c7b89d2ac1c339340df25c4bc23a1ef8cb55a5

                                                                                                      SHA512

                                                                                                      dda73408ff0d14050d23b7e9eb732599de018dd16d9e603812e0d17811847790e0fbde1fcacdd0f21c7df9af223081e10b1471d74172c8a99322045c813736ff

                                                                                                    • /etc/init.d/linux_kill

                                                                                                      Filesize

                                                                                                      189B

                                                                                                      MD5

                                                                                                      3909975f7cc0d1121c1819b800069f31

                                                                                                      SHA1

                                                                                                      3e68de708c2e6c40fab6794afdee3104e5590189

                                                                                                      SHA256

                                                                                                      6876dac71f13a068afb863d257134275f2edba43b2acaf4924fabf97c079070b

                                                                                                      SHA512

                                                                                                      50600cceeb03b05f45ae61d890caee9f51ff390b6776930866e527e071d65d08241fc66673fd9b99d62fbc77d3c00fc3de4d7378cbc42f5daba5d83072b0906e

                                                                                                    • /etc/profile.d/bash_config.sh

                                                                                                      Filesize

                                                                                                      37B

                                                                                                      MD5

                                                                                                      cfb4e51061485fe91169381fbdc1538e

                                                                                                      SHA1

                                                                                                      9a85b9b766a15b01737a41d680e4593b7a9bde87

                                                                                                      SHA256

                                                                                                      897f37267d0ceaa2fbdaa09847f5d08e6f8b01a0348a0d666264b0f10acd0c90

                                                                                                      SHA512

                                                                                                      fb154ec711d2090a7461da4db8ddad2b522649a27e74162ecb203f539b1729430288bc02d78d2071bde9c4bbc005693403a57612ef50277d52f816cb94524216