Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    debian-9_armhf
  • resource
    debian9-armhf-20240418-en
  • resource tags

    arch:armhfimage:debian9-armhf-20240418-enkernel:4.9.0-13-armmp-lpaelocale:en-usos:debian-9-armhfsystem
  • submitted
    08-11-2024 09:23

General

  • Target

    linux_arm7.elf

  • Size

    5.1MB

  • MD5

    7c906062c4cbd0ca1eb795a1adcd48bb

  • SHA1

    8253d4e0fa13fe8a05961ffbf8e1245c9080556c

  • SHA256

    ff466605516a4e2b5b2baf5f98efff8178892a96d9043a77b29088953ea3f12a

  • SHA512

    37f969c03ec5c07e3d4facd241b0c5d808570f6535fb785aee85352d849278fdf98a091b5234fc104fd24251f6d6e79c19c4df53ff2079a4ec7c261255978b1c

  • SSDEEP

    49152:PJzG9XxZPF773LVPN9GnMbaVZGNJru8cYWPAXq7nLYvV0rzmpxUIU1F1:hzG9Xn53LtN9pbu0Jru8cYWPAXqG

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_arm7.elf
    /tmp/linux_arm7.elf
    1⤵
    • Enumerates kernel/hardware configuration
    PID:638
    • /bin/sh
      sh -c "/etc/32678&"
      2⤵
        PID:659
      • /usr/sbin/service
        service crond start
        2⤵
          PID:660
          • /usr/bin/basename
            basename /usr/sbin/service
            3⤵
              PID:665
            • /usr/bin/basename
              basename /usr/sbin/service
              3⤵
                PID:671
              • /bin/systemctl
                systemctl --quiet is-active multi-user.target
                3⤵
                • Enumerates kernel/hardware configuration
                • Reads runtime system information
                PID:674
              • /bin/sed
                sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                3⤵
                  PID:682
                • /bin/systemctl
                  systemctl list-unit-files --full "--type=socket"
                  3⤵
                  • Enumerates kernel/hardware configuration
                  • Reads runtime system information
                  PID:681
              • /tmp/linux_arm7.elf
                /tmp/linux_arm7.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:661
                • /usr/sbin/update-rc.d
                  update-rc.d linux_kill defaults
                  3⤵
                    PID:676
                    • /usr/local/sbin/systemctl
                      systemctl daemon-reload
                      4⤵
                        PID:685
                      • /usr/local/bin/systemctl
                        systemctl daemon-reload
                        4⤵
                          PID:685
                        • /usr/sbin/systemctl
                          systemctl daemon-reload
                          4⤵
                            PID:685
                          • /usr/bin/systemctl
                            systemctl daemon-reload
                            4⤵
                              PID:685
                            • /sbin/systemctl
                              systemctl daemon-reload
                              4⤵
                                PID:685
                              • /bin/systemctl
                                systemctl daemon-reload
                                4⤵
                                • Enumerates kernel/hardware configuration
                                PID:685
                            • /bin/bash
                              bash -c "echo \"*/1 * * * * root /.img \" >> /etc/crontab"
                              3⤵
                              • Creates/modifies Cron job
                              PID:691
                            • /usr/bin/renice
                              renice -20 661
                              3⤵
                                PID:692
                              • /bin/mount
                                mount -o bind /tmp/ /proc/661
                                3⤵
                                  PID:693
                                • /usr/sbin/service
                                  service cron start
                                  3⤵
                                    PID:695
                                    • /usr/bin/basename
                                      basename /usr/sbin/service
                                      4⤵
                                        PID:696
                                      • /usr/bin/basename
                                        basename /usr/sbin/service
                                        4⤵
                                          PID:697
                                        • /bin/systemctl
                                          systemctl --quiet is-active multi-user.target
                                          4⤵
                                          • Enumerates kernel/hardware configuration
                                          PID:698
                                        • /bin/systemctl
                                          systemctl list-unit-files --full "--type=socket"
                                          4⤵
                                          • Enumerates kernel/hardware configuration
                                          • Reads runtime system information
                                          PID:700
                                        • /bin/sed
                                          sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                          4⤵
                                          • Reads runtime system information
                                          PID:701
                                      • /usr/local/sbin/systemctl
                                        systemctl "--job-mode=ignore-dependencies" start cron.service
                                        3⤵
                                          PID:695
                                        • /usr/local/bin/systemctl
                                          systemctl "--job-mode=ignore-dependencies" start cron.service
                                          3⤵
                                            PID:695
                                          • /usr/sbin/systemctl
                                            systemctl "--job-mode=ignore-dependencies" start cron.service
                                            3⤵
                                              PID:695
                                            • /usr/bin/systemctl
                                              systemctl "--job-mode=ignore-dependencies" start cron.service
                                              3⤵
                                                PID:695
                                              • /sbin/systemctl
                                                systemctl "--job-mode=ignore-dependencies" start cron.service
                                                3⤵
                                                  PID:695
                                                • /bin/systemctl
                                                  systemctl "--job-mode=ignore-dependencies" start cron.service
                                                  3⤵
                                                  • Enumerates kernel/hardware configuration
                                                  • Reads runtime system information
                                                  PID:695
                                                • /bin/systemctl
                                                  systemctl start crond.service
                                                  3⤵
                                                  • Enumerates kernel/hardware configuration
                                                  PID:702
                                            • /etc/32678
                                              /etc/32678
                                              1⤵
                                              • Executes dropped EXE
                                              PID:663
                                              • /bin/sleep
                                                sleep 60
                                                2⤵
                                                  PID:666
                                                • /etc/id.services.conf
                                                  /etc/id.services.conf
                                                  2⤵
                                                  • Executes dropped EXE
                                                  • Enumerates kernel/hardware configuration
                                                  PID:805
                                                  • /usr/bin/pkill
                                                    pkill -9 32678
                                                    3⤵
                                                    • Reads CPU attributes
                                                    • Reads runtime system information
                                                    PID:809
                                                  • /bin/sh
                                                    sh -c "/etc/32678&"
                                                    3⤵
                                                      PID:810
                                                    • /usr/sbin/service
                                                      service crond start
                                                      3⤵
                                                        PID:811
                                                        • /usr/bin/basename
                                                          basename /usr/sbin/service
                                                          4⤵
                                                            PID:814
                                                          • /usr/bin/basename
                                                            basename /usr/sbin/service
                                                            4⤵
                                                              PID:819
                                                            • /bin/systemctl
                                                              systemctl --quiet is-active multi-user.target
                                                              4⤵
                                                              • Enumerates kernel/hardware configuration
                                                              PID:820
                                                            • /bin/systemctl
                                                              systemctl list-unit-files --full "--type=socket"
                                                              4⤵
                                                              • Enumerates kernel/hardware configuration
                                                              • Reads runtime system information
                                                              PID:822
                                                            • /bin/sed
                                                              sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                                              4⤵
                                                                PID:823
                                                            • /etc/id.services.conf
                                                              /etc/id.services.conf " "
                                                              3⤵
                                                              • Executes dropped EXE
                                                              • Enumerates kernel/hardware configuration
                                                              PID:812
                                                        • /usr/local/sbin/systemctl
                                                          systemctl "--job-mode=ignore-dependencies" start crond.service
                                                          1⤵
                                                            PID:660
                                                          • /usr/local/bin/systemctl
                                                            systemctl "--job-mode=ignore-dependencies" start crond.service
                                                            1⤵
                                                              PID:660
                                                            • /usr/sbin/systemctl
                                                              systemctl "--job-mode=ignore-dependencies" start crond.service
                                                              1⤵
                                                                PID:660
                                                              • /usr/bin/systemctl
                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                1⤵
                                                                  PID:660
                                                                • /sbin/systemctl
                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                  1⤵
                                                                    PID:660
                                                                  • /bin/systemctl
                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                    1⤵
                                                                    • Enumerates kernel/hardware configuration
                                                                    PID:660
                                                                  • /etc/32678
                                                                    /etc/32678
                                                                    1⤵
                                                                    • Executes dropped EXE
                                                                    PID:813
                                                                    • /bin/sleep
                                                                      sleep 60
                                                                      2⤵
                                                                        PID:815
                                                                      • /etc/id.services.conf
                                                                        /etc/id.services.conf
                                                                        2⤵
                                                                        • Executes dropped EXE
                                                                        • Enumerates kernel/hardware configuration
                                                                        PID:844
                                                                        • /usr/bin/pkill
                                                                          pkill -9 32678
                                                                          3⤵
                                                                          • Reads CPU attributes
                                                                          • Reads runtime system information
                                                                          PID:848
                                                                        • /bin/sh
                                                                          sh -c "/etc/32678&"
                                                                          3⤵
                                                                            PID:849
                                                                          • /usr/sbin/service
                                                                            service crond start
                                                                            3⤵
                                                                              PID:850
                                                                              • /usr/bin/basename
                                                                                basename /usr/sbin/service
                                                                                4⤵
                                                                                  PID:853
                                                                                • /usr/bin/basename
                                                                                  basename /usr/sbin/service
                                                                                  4⤵
                                                                                    PID:858
                                                                                  • /bin/systemctl
                                                                                    systemctl --quiet is-active multi-user.target
                                                                                    4⤵
                                                                                    • Enumerates kernel/hardware configuration
                                                                                    • Reads runtime system information
                                                                                    PID:859
                                                                                  • /bin/sed
                                                                                    sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                                                                    4⤵
                                                                                      PID:862
                                                                                    • /bin/systemctl
                                                                                      systemctl list-unit-files --full "--type=socket"
                                                                                      4⤵
                                                                                      • Enumerates kernel/hardware configuration
                                                                                      PID:861
                                                                                  • /etc/id.services.conf
                                                                                    /etc/id.services.conf " "
                                                                                    3⤵
                                                                                    • Executes dropped EXE
                                                                                    • Enumerates kernel/hardware configuration
                                                                                    PID:851
                                                                              • /usr/local/sbin/systemctl
                                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                1⤵
                                                                                  PID:811
                                                                                • /usr/local/bin/systemctl
                                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                  1⤵
                                                                                    PID:811
                                                                                  • /usr/sbin/systemctl
                                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                    1⤵
                                                                                      PID:811
                                                                                    • /usr/bin/systemctl
                                                                                      systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                      1⤵
                                                                                        PID:811
                                                                                      • /sbin/systemctl
                                                                                        systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                        1⤵
                                                                                          PID:811
                                                                                        • /bin/systemctl
                                                                                          systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                          1⤵
                                                                                          • Enumerates kernel/hardware configuration
                                                                                          PID:811
                                                                                        • /etc/32678
                                                                                          /etc/32678
                                                                                          1⤵
                                                                                          • Executes dropped EXE
                                                                                          PID:852
                                                                                          • /bin/sleep
                                                                                            sleep 60
                                                                                            2⤵
                                                                                              PID:854
                                                                                          • /usr/local/sbin/systemctl
                                                                                            systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                            1⤵
                                                                                              PID:850
                                                                                            • /usr/local/bin/systemctl
                                                                                              systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                              1⤵
                                                                                                PID:850
                                                                                              • /usr/sbin/systemctl
                                                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                1⤵
                                                                                                  PID:850
                                                                                                • /usr/bin/systemctl
                                                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                  1⤵
                                                                                                    PID:850
                                                                                                  • /sbin/systemctl
                                                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                    1⤵
                                                                                                      PID:850
                                                                                                    • /bin/systemctl
                                                                                                      systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                      1⤵
                                                                                                      • Enumerates kernel/hardware configuration
                                                                                                      • Reads runtime system information
                                                                                                      PID:850

                                                                                                    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

                                                                                                      7c906062c4cbd0ca1eb795a1adcd48bb

                                                                                                      SHA1

                                                                                                      8253d4e0fa13fe8a05961ffbf8e1245c9080556c

                                                                                                      SHA256

                                                                                                      ff466605516a4e2b5b2baf5f98efff8178892a96d9043a77b29088953ea3f12a

                                                                                                      SHA512

                                                                                                      37f969c03ec5c07e3d4facd241b0c5d808570f6535fb785aee85352d849278fdf98a091b5234fc104fd24251f6d6e79c19c4df53ff2079a4ec7c261255978b1c

                                                                                                    • /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