Analysis

  • max time kernel
    149s
  • max time network
    166s
  • 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
    04-11-2024 16:17

General

  • Target

    linux_arm7.elf

  • Size

    5.1MB

  • MD5

    b3d5067ad7cc5c330ea53579d837f8b3

  • SHA1

    a8519299f1ab0945ff9f5607fa308a01f8055454

  • SHA256

    35808f69f5f76ddd48c2668e78256b04df0758c952d4b41323030c1ff160bac9

  • SHA512

    e33b0ecae001719dbe5df6780c2e5ef04a27745ea2bb1e551a99115dec3b89c378313edfccea3829b3ed659d25c205658a183d273f248c8b9220bb679edea05f

  • SSDEEP

    49152:PJzG9XxZPF773LVPN9GnMbaVZGNJru8cYWPAXq7nLYvV/rzmpxUIU1F1:hzG9Xn53LtN9pbu0Jru8cYWPAXqZ

Malware Config

Extracted

Family

kaiji

C2

78789.dns.army: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.

  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

Processes

  • /tmp/linux_arm7.elf
    /tmp/linux_arm7.elf
    1⤵
    • Enumerates kernel/hardware configuration
    PID:641
    • /bin/sh
      sh -c "/etc/32678&"
      2⤵
        PID:658
        • /etc/32678
          /etc/32678
          3⤵
          • Executes dropped EXE
          PID:662
          • /bin/sleep
            sleep 60
            4⤵
              PID:666
            • /etc/id.services.conf
              /etc/id.services.conf
              4⤵
              • Executes dropped EXE
              • Enumerates kernel/hardware configuration
              PID:800
              • /usr/bin/pkill
                pkill -9 32678
                5⤵
                • Reads CPU attributes
                • Reads runtime system information
                PID:804
              • /bin/sh
                sh -c "/etc/32678&"
                5⤵
                  PID:805
                • /usr/sbin/service
                  service crond start
                  5⤵
                    PID:806
                    • /usr/bin/basename
                      basename /usr/sbin/service
                      6⤵
                        PID:809
                      • /usr/bin/basename
                        basename /usr/sbin/service
                        6⤵
                          PID:810
                        • /bin/systemctl
                          systemctl --quiet is-active multi-user.target
                          6⤵
                          • Enumerates kernel/hardware configuration
                          • Reads runtime system information
                          PID:815
                        • /bin/systemctl
                          systemctl list-unit-files --full "--type=socket"
                          6⤵
                          • Enumerates kernel/hardware configuration
                          • Reads runtime system information
                          PID:818
                        • /bin/sed
                          sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                          6⤵
                            PID:819
                        • /etc/id.services.conf
                          /etc/id.services.conf " "
                          5⤵
                          • Executes dropped EXE
                          • Enumerates kernel/hardware configuration
                          PID:807
                  • /usr/sbin/service
                    service crond start
                    2⤵
                      PID:660
                      • /usr/bin/basename
                        basename /usr/sbin/service
                        3⤵
                          PID:664
                        • /usr/bin/basename
                          basename /usr/sbin/service
                          3⤵
                            PID:670
                          • /bin/systemctl
                            systemctl --quiet is-active multi-user.target
                            3⤵
                            • Enumerates kernel/hardware configuration
                            PID:676
                          • /bin/systemctl
                            systemctl list-unit-files --full "--type=socket"
                            3⤵
                            • Enumerates kernel/hardware configuration
                            • Reads runtime system information
                            PID:681
                          • /bin/sed
                            sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                            3⤵
                              PID:682
                          • /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:677
                                • /usr/local/sbin/systemctl
                                  systemctl daemon-reload
                                  4⤵
                                    PID:686
                                  • /usr/local/bin/systemctl
                                    systemctl daemon-reload
                                    4⤵
                                      PID:686
                                    • /usr/sbin/systemctl
                                      systemctl daemon-reload
                                      4⤵
                                        PID:686
                                      • /usr/bin/systemctl
                                        systemctl daemon-reload
                                        4⤵
                                          PID:686
                                        • /sbin/systemctl
                                          systemctl daemon-reload
                                          4⤵
                                            PID:686
                                          • /bin/systemctl
                                            systemctl daemon-reload
                                            4⤵
                                            • Enumerates kernel/hardware configuration
                                            PID:686
                                        • /bin/bash
                                          bash -c "echo \"*/1 * * * * root /.img \" >> /etc/crontab"
                                          3⤵
                                          • Creates/modifies Cron job
                                          PID:695
                                        • /usr/bin/renice
                                          renice -20 661
                                          3⤵
                                            PID:696
                                          • /bin/mount
                                            mount -o bind /tmp/ /proc/661
                                            3⤵
                                              PID:697
                                            • /usr/sbin/service
                                              service cron start
                                              3⤵
                                                PID:698
                                                • /usr/bin/basename
                                                  basename /usr/sbin/service
                                                  4⤵
                                                    PID:699
                                                  • /usr/bin/basename
                                                    basename /usr/sbin/service
                                                    4⤵
                                                      PID:700
                                                    • /bin/systemctl
                                                      systemctl --quiet is-active multi-user.target
                                                      4⤵
                                                      • Enumerates kernel/hardware configuration
                                                      PID:701
                                                    • /bin/systemctl
                                                      systemctl list-unit-files --full "--type=socket"
                                                      4⤵
                                                      • Enumerates kernel/hardware configuration
                                                      • Reads runtime system information
                                                      PID:704
                                                    • /bin/sed
                                                      sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                                      4⤵
                                                        PID:705
                                                    • /usr/local/sbin/systemctl
                                                      systemctl "--job-mode=ignore-dependencies" start cron.service
                                                      3⤵
                                                        PID:698
                                                      • /usr/local/bin/systemctl
                                                        systemctl "--job-mode=ignore-dependencies" start cron.service
                                                        3⤵
                                                          PID:698
                                                        • /usr/sbin/systemctl
                                                          systemctl "--job-mode=ignore-dependencies" start cron.service
                                                          3⤵
                                                            PID:698
                                                          • /usr/bin/systemctl
                                                            systemctl "--job-mode=ignore-dependencies" start cron.service
                                                            3⤵
                                                              PID:698
                                                            • /sbin/systemctl
                                                              systemctl "--job-mode=ignore-dependencies" start cron.service
                                                              3⤵
                                                                PID:698
                                                              • /bin/systemctl
                                                                systemctl "--job-mode=ignore-dependencies" start cron.service
                                                                3⤵
                                                                • Enumerates kernel/hardware configuration
                                                                PID:698
                                                              • /bin/systemctl
                                                                systemctl start crond.service
                                                                3⤵
                                                                • Enumerates kernel/hardware configuration
                                                                PID:706
                                                          • /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
                                                                      • Reads runtime system information
                                                                      PID:660
                                                                    • /etc/32678
                                                                      /etc/32678
                                                                      1⤵
                                                                      • Executes dropped EXE
                                                                      PID:808
                                                                      • /bin/sleep
                                                                        sleep 60
                                                                        2⤵
                                                                          PID:811
                                                                        • /etc/id.services.conf
                                                                          /etc/id.services.conf
                                                                          2⤵
                                                                          • Executes dropped EXE
                                                                          • Enumerates kernel/hardware configuration
                                                                          PID:838
                                                                          • /usr/bin/pkill
                                                                            pkill -9 32678
                                                                            3⤵
                                                                            • Reads CPU attributes
                                                                            • Reads runtime system information
                                                                            PID:842
                                                                          • /bin/sh
                                                                            sh -c "/etc/32678&"
                                                                            3⤵
                                                                              PID:843
                                                                            • /usr/sbin/service
                                                                              service crond start
                                                                              3⤵
                                                                                PID:844
                                                                                • /usr/bin/basename
                                                                                  basename /usr/sbin/service
                                                                                  4⤵
                                                                                    PID:847
                                                                                  • /usr/bin/basename
                                                                                    basename /usr/sbin/service
                                                                                    4⤵
                                                                                      PID:849
                                                                                    • /bin/systemctl
                                                                                      systemctl --quiet is-active multi-user.target
                                                                                      4⤵
                                                                                      • Enumerates kernel/hardware configuration
                                                                                      • Reads runtime system information
                                                                                      PID:853
                                                                                    • /bin/sed
                                                                                      sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                                                                      4⤵
                                                                                        PID:856
                                                                                      • /bin/systemctl
                                                                                        systemctl list-unit-files --full "--type=socket"
                                                                                        4⤵
                                                                                        • Enumerates kernel/hardware configuration
                                                                                        • Reads runtime system information
                                                                                        PID:855
                                                                                    • /etc/id.services.conf
                                                                                      /etc/id.services.conf " "
                                                                                      3⤵
                                                                                      • Executes dropped EXE
                                                                                      • Enumerates kernel/hardware configuration
                                                                                      PID:845
                                                                                • /usr/local/sbin/systemctl
                                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                  1⤵
                                                                                    PID:806
                                                                                  • /usr/local/bin/systemctl
                                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                    1⤵
                                                                                      PID:806
                                                                                    • /usr/sbin/systemctl
                                                                                      systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                      1⤵
                                                                                        PID:806
                                                                                      • /usr/bin/systemctl
                                                                                        systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                        1⤵
                                                                                          PID:806
                                                                                        • /sbin/systemctl
                                                                                          systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                          1⤵
                                                                                            PID:806
                                                                                          • /bin/systemctl
                                                                                            systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                            1⤵
                                                                                            • Enumerates kernel/hardware configuration
                                                                                            PID:806
                                                                                          • /etc/32678
                                                                                            /etc/32678
                                                                                            1⤵
                                                                                            • Executes dropped EXE
                                                                                            PID:846
                                                                                            • /bin/sleep
                                                                                              sleep 60
                                                                                              2⤵
                                                                                                PID:848
                                                                                            • /usr/local/sbin/systemctl
                                                                                              systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                              1⤵
                                                                                                PID:844
                                                                                              • /usr/local/bin/systemctl
                                                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                1⤵
                                                                                                  PID:844
                                                                                                • /usr/sbin/systemctl
                                                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                  1⤵
                                                                                                    PID:844
                                                                                                  • /usr/bin/systemctl
                                                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                    1⤵
                                                                                                      PID:844
                                                                                                    • /sbin/systemctl
                                                                                                      systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                      1⤵
                                                                                                        PID:844
                                                                                                      • /bin/systemctl
                                                                                                        systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                        1⤵
                                                                                                        • Enumerates kernel/hardware configuration
                                                                                                        • Reads runtime system information
                                                                                                        PID:844

                                                                                                      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

                                                                                                        b3d5067ad7cc5c330ea53579d837f8b3

                                                                                                        SHA1

                                                                                                        a8519299f1ab0945ff9f5607fa308a01f8055454

                                                                                                        SHA256

                                                                                                        35808f69f5f76ddd48c2668e78256b04df0758c952d4b41323030c1ff160bac9

                                                                                                        SHA512

                                                                                                        e33b0ecae001719dbe5df6780c2e5ef04a27745ea2bb1e551a99115dec3b89c378313edfccea3829b3ed659d25c205658a183d273f248c8b9220bb679edea05f

                                                                                                      • /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