Analysis

  • max time kernel
    149s
  • max time network
    151s
  • 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 17:27

General

  • Target

    linux_arm6.elf

  • Size

    5.1MB

  • MD5

    8bd999abd9893c4be18600f481b04ad3

  • SHA1

    10080f79cd6bed96cb3c35e896443c37460b10bf

  • SHA256

    3bd7660e77cbac4a9c8e0d85c03fe144ff34177087dc739e2b66a1293653aeb0

  • SHA512

    81601a5cfa807f87628bc75aa16c7d9a4d052961e33e0423bffd520063fcb399f79ba6594715704e2dc8926989fd1293a5842c8cd08a60f4fed55fb88e519c09

  • SSDEEP

    98304:8cSBHdgN2a7JP97kJru8cYWPAXqDu+60:8cS03Lu+6

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

  • Creates a large amount of network flows 1 TTPs

    This may indicate a network scan to discover remotely running services.

  • 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_arm6.elf
    /tmp/linux_arm6.elf
    1⤵
    • Enumerates kernel/hardware configuration
    PID:657
    • /bin/sh
      sh -c "/etc/32678&"
      2⤵
        PID:676
      • /usr/sbin/service
        service crond start
        2⤵
          PID:677
          • /usr/bin/basename
            basename /usr/sbin/service
            3⤵
              PID:682
            • /usr/bin/basename
              basename /usr/sbin/service
              3⤵
                PID:688
              • /bin/systemctl
                systemctl --quiet is-active multi-user.target
                3⤵
                • Enumerates kernel/hardware configuration
                • Reads runtime system information
                PID:691
              • /bin/sed
                sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                3⤵
                  PID:701
                • /bin/systemctl
                  systemctl list-unit-files --full "--type=socket"
                  3⤵
                  • Enumerates kernel/hardware configuration
                  PID:700
              • /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:678
                • /usr/sbin/update-rc.d
                  update-rc.d linux_kill defaults
                  3⤵
                    PID:694
                    • /usr/local/sbin/systemctl
                      systemctl daemon-reload
                      4⤵
                        PID:704
                      • /usr/local/bin/systemctl
                        systemctl daemon-reload
                        4⤵
                          PID:704
                        • /usr/sbin/systemctl
                          systemctl daemon-reload
                          4⤵
                            PID:704
                          • /usr/bin/systemctl
                            systemctl daemon-reload
                            4⤵
                              PID:704
                            • /sbin/systemctl
                              systemctl daemon-reload
                              4⤵
                                PID:704
                              • /bin/systemctl
                                systemctl daemon-reload
                                4⤵
                                • Enumerates kernel/hardware configuration
                                PID:704
                            • /bin/bash
                              bash -c "echo \"*/1 * * * * root /.img \" >> /etc/crontab"
                              3⤵
                              • Creates/modifies Cron job
                              PID:710
                            • /usr/bin/renice
                              renice -20 678
                              3⤵
                                PID:711
                              • /bin/mount
                                mount -o bind /tmp/ /proc/678
                                3⤵
                                  PID:712
                                • /usr/sbin/service
                                  service cron start
                                  3⤵
                                    PID:713
                                    • /usr/bin/basename
                                      basename /usr/sbin/service
                                      4⤵
                                        PID:714
                                      • /usr/bin/basename
                                        basename /usr/sbin/service
                                        4⤵
                                          PID:715
                                        • /bin/systemctl
                                          systemctl --quiet is-active multi-user.target
                                          4⤵
                                          • Enumerates kernel/hardware configuration
                                          PID:716
                                        • /bin/systemctl
                                          systemctl list-unit-files --full "--type=socket"
                                          4⤵
                                          • Enumerates kernel/hardware configuration
                                          PID:718
                                        • /bin/sed
                                          sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                          4⤵
                                          • Reads runtime system information
                                          PID:719
                                      • /usr/local/sbin/systemctl
                                        systemctl "--job-mode=ignore-dependencies" start cron.service
                                        3⤵
                                          PID:713
                                        • /usr/local/bin/systemctl
                                          systemctl "--job-mode=ignore-dependencies" start cron.service
                                          3⤵
                                            PID:713
                                          • /usr/sbin/systemctl
                                            systemctl "--job-mode=ignore-dependencies" start cron.service
                                            3⤵
                                              PID:713
                                            • /usr/bin/systemctl
                                              systemctl "--job-mode=ignore-dependencies" start cron.service
                                              3⤵
                                                PID:713
                                              • /sbin/systemctl
                                                systemctl "--job-mode=ignore-dependencies" start cron.service
                                                3⤵
                                                  PID:713
                                                • /bin/systemctl
                                                  systemctl "--job-mode=ignore-dependencies" start cron.service
                                                  3⤵
                                                  • Enumerates kernel/hardware configuration
                                                  PID:713
                                                • /bin/systemctl
                                                  systemctl start crond.service
                                                  3⤵
                                                  • Enumerates kernel/hardware configuration
                                                  • Reads runtime system information
                                                  PID:720
                                            • /etc/32678
                                              /etc/32678
                                              1⤵
                                              • Executes dropped EXE
                                              PID:680
                                              • /bin/sleep
                                                sleep 60
                                                2⤵
                                                  PID:684
                                                • /etc/id.services.conf
                                                  /etc/id.services.conf
                                                  2⤵
                                                  • Executes dropped EXE
                                                  • Enumerates kernel/hardware configuration
                                                  PID:824
                                                  • /usr/bin/pkill
                                                    pkill -9 32678
                                                    3⤵
                                                    • Reads CPU attributes
                                                    • Reads runtime system information
                                                    PID:828
                                                  • /bin/sh
                                                    sh -c "/etc/32678&"
                                                    3⤵
                                                      PID:829
                                                    • /usr/sbin/service
                                                      service crond start
                                                      3⤵
                                                        PID:830
                                                        • /usr/bin/basename
                                                          basename /usr/sbin/service
                                                          4⤵
                                                            PID:833
                                                          • /usr/bin/basename
                                                            basename /usr/sbin/service
                                                            4⤵
                                                              PID:838
                                                            • /bin/systemctl
                                                              systemctl --quiet is-active multi-user.target
                                                              4⤵
                                                              • Enumerates kernel/hardware configuration
                                                              PID:839
                                                            • /bin/systemctl
                                                              systemctl list-unit-files --full "--type=socket"
                                                              4⤵
                                                              • Enumerates kernel/hardware configuration
                                                              • Reads runtime system information
                                                              PID:841
                                                            • /bin/sed
                                                              sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                                              4⤵
                                                                PID:842
                                                            • /etc/id.services.conf
                                                              /etc/id.services.conf " "
                                                              3⤵
                                                              • Executes dropped EXE
                                                              • Enumerates kernel/hardware configuration
                                                              PID:831
                                                        • /usr/local/sbin/systemctl
                                                          systemctl "--job-mode=ignore-dependencies" start crond.service
                                                          1⤵
                                                            PID:677
                                                          • /usr/local/bin/systemctl
                                                            systemctl "--job-mode=ignore-dependencies" start crond.service
                                                            1⤵
                                                              PID:677
                                                            • /usr/sbin/systemctl
                                                              systemctl "--job-mode=ignore-dependencies" start crond.service
                                                              1⤵
                                                                PID:677
                                                              • /usr/bin/systemctl
                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                1⤵
                                                                  PID:677
                                                                • /sbin/systemctl
                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                  1⤵
                                                                    PID:677
                                                                  • /bin/systemctl
                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                    1⤵
                                                                    • Enumerates kernel/hardware configuration
                                                                    PID:677
                                                                  • /etc/32678
                                                                    /etc/32678
                                                                    1⤵
                                                                    • Executes dropped EXE
                                                                    PID:832
                                                                    • /bin/sleep
                                                                      sleep 60
                                                                      2⤵
                                                                        PID:834
                                                                      • /etc/id.services.conf
                                                                        /etc/id.services.conf
                                                                        2⤵
                                                                        • Executes dropped EXE
                                                                        • Enumerates kernel/hardware configuration
                                                                        PID:863
                                                                        • /usr/bin/pkill
                                                                          pkill -9 32678
                                                                          3⤵
                                                                          • Reads CPU attributes
                                                                          • Reads runtime system information
                                                                          PID:867
                                                                        • /bin/sh
                                                                          sh -c "/etc/32678&"
                                                                          3⤵
                                                                            PID:868
                                                                          • /usr/sbin/service
                                                                            service crond start
                                                                            3⤵
                                                                              PID:869
                                                                              • /usr/bin/basename
                                                                                basename /usr/sbin/service
                                                                                4⤵
                                                                                  PID:872
                                                                                • /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:878
                                                                                  • /bin/sed
                                                                                    sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                                                                    4⤵
                                                                                      PID:881
                                                                                    • /bin/systemctl
                                                                                      systemctl list-unit-files --full "--type=socket"
                                                                                      4⤵
                                                                                      • Enumerates kernel/hardware configuration
                                                                                      • Reads runtime system information
                                                                                      PID:880
                                                                                  • /etc/id.services.conf
                                                                                    /etc/id.services.conf " "
                                                                                    3⤵
                                                                                    • Executes dropped EXE
                                                                                    • Enumerates kernel/hardware configuration
                                                                                    PID:870
                                                                              • /usr/local/sbin/systemctl
                                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                1⤵
                                                                                  PID:830
                                                                                • /usr/local/bin/systemctl
                                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                  1⤵
                                                                                    PID:830
                                                                                  • /usr/sbin/systemctl
                                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                    1⤵
                                                                                      PID:830
                                                                                    • /usr/bin/systemctl
                                                                                      systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                      1⤵
                                                                                        PID:830
                                                                                      • /sbin/systemctl
                                                                                        systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                        1⤵
                                                                                          PID:830
                                                                                        • /bin/systemctl
                                                                                          systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                          1⤵
                                                                                          • Enumerates kernel/hardware configuration
                                                                                          • Reads runtime system information
                                                                                          PID:830
                                                                                        • /etc/32678
                                                                                          /etc/32678
                                                                                          1⤵
                                                                                          • Executes dropped EXE
                                                                                          PID:871
                                                                                          • /bin/sleep
                                                                                            sleep 60
                                                                                            2⤵
                                                                                              PID:873
                                                                                          • /usr/local/sbin/systemctl
                                                                                            systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                            1⤵
                                                                                              PID:869
                                                                                            • /usr/local/bin/systemctl
                                                                                              systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                              1⤵
                                                                                                PID:869
                                                                                              • /usr/sbin/systemctl
                                                                                                systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                1⤵
                                                                                                  PID:869
                                                                                                • /usr/bin/systemctl
                                                                                                  systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                  1⤵
                                                                                                    PID:869
                                                                                                  • /sbin/systemctl
                                                                                                    systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                    1⤵
                                                                                                      PID:869
                                                                                                    • /bin/systemctl
                                                                                                      systemctl "--job-mode=ignore-dependencies" start crond.service
                                                                                                      1⤵
                                                                                                      • Enumerates kernel/hardware configuration
                                                                                                      PID:869

                                                                                                    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

                                                                                                      8bd999abd9893c4be18600f481b04ad3

                                                                                                      SHA1

                                                                                                      10080f79cd6bed96cb3c35e896443c37460b10bf

                                                                                                      SHA256

                                                                                                      3bd7660e77cbac4a9c8e0d85c03fe144ff34177087dc739e2b66a1293653aeb0

                                                                                                      SHA512

                                                                                                      81601a5cfa807f87628bc75aa16c7d9a4d052961e33e0423bffd520063fcb399f79ba6594715704e2dc8926989fd1293a5842c8cd08a60f4fed55fb88e519c09

                                                                                                    • /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