Analysis

  • max time kernel
    149s
  • max time network
    154s
  • 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
    02-11-2024 02:52

General

  • Target

    639af202eb3c903183b8ae3d8ba4951e.elf

  • Size

    2.0MB

  • MD5

    639af202eb3c903183b8ae3d8ba4951e

  • SHA1

    78ad606c247165cb75c4e349d9be702517203224

  • SHA256

    668e2cdc076b620be68a4d5aa2ed14d2fa9b48b556f0e8f69548d8a972436155

  • SHA512

    1eb84b880900795da9bb834e88422c8a81bd83f7fb0dcdf090f8b178b21e486e0010126bd249c84cf2b2f6dcad3fc0597acad073b299512fba8f9f02ef0c4767

  • SSDEEP

    24576:J1rMILphWsdRm6vM7lUVJtq8wfe9OqbVgYQ3k48jtIMoG34RJnWVh1BPnjKqZdtX:JVfjmRMo2T1

Malware Config

Extracted

Family

kaiji

C2

ss.us-tv.top:1930

Signatures

  • Kaiji 1 IoCs

    Kaiji payload

  • Kaiji family
  • Executes dropped EXE 5 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 17 IoCs

    Adds/modifies system service, likely for persistence.

  • Write file to user bin folder 2 IoCs
  • Modifies Bash startup script 2 TTPs 3 IoCs
  • Command and Scripting Interpreter: Unix Shell 1 TTPs 2 IoCs

    Execute scripts via Unix Shell.

  • Enumerates kernel/hardware configuration 1 TTPs 13 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/639af202eb3c903183b8ae3d8ba4951e.elf
    /tmp/639af202eb3c903183b8ae3d8ba4951e.elf
    1⤵
    • Enumerates kernel/hardware configuration
    PID:660
    • /tmp/639af202eb3c903183b8ae3d8ba4951e.elf
      /tmp/639af202eb3c903183b8ae3d8ba4951e.elf " "
      2⤵
      • Modifies Watchdog functionality
      • Creates/modifies environment variables
      • Modifies init.d
      • Write file to user bin folder
      • Modifies Bash startup script
      • Enumerates kernel/hardware configuration
      • Reads runtime system information
      PID:666
      • /bin/sh
        /bin/sh -c "/etc/32676&"
        3⤵
        • Command and Scripting Interpreter: Unix Shell
        PID:679
      • /usr/sbin/service
        service crond start
        3⤵
          PID:682
          • /usr/bin/basename
            basename /usr/sbin/service
            4⤵
              PID:685
            • /usr/bin/basename
              basename /usr/sbin/service
              4⤵
                PID:687
              • /bin/systemctl
                systemctl --quiet is-active multi-user.target
                4⤵
                • Enumerates kernel/hardware configuration
                • Reads runtime system information
                PID:690
              • /bin/sed
                sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                4⤵
                  PID:696
                • /bin/systemctl
                  systemctl list-unit-files --full "--type=socket"
                  4⤵
                  • Enumerates kernel/hardware configuration
                  • Reads runtime system information
                  PID:695
              • /usr/local/sbin/systemctl
                systemctl "--job-mode=ignore-dependencies" start crond.service
                3⤵
                  PID:682
                • /usr/local/bin/systemctl
                  systemctl "--job-mode=ignore-dependencies" start crond.service
                  3⤵
                    PID:682
                  • /usr/sbin/systemctl
                    systemctl "--job-mode=ignore-dependencies" start crond.service
                    3⤵
                      PID:682
                    • /usr/bin/systemctl
                      systemctl "--job-mode=ignore-dependencies" start crond.service
                      3⤵
                        PID:682
                      • /sbin/systemctl
                        systemctl "--job-mode=ignore-dependencies" start crond.service
                        3⤵
                          PID:682
                        • /bin/systemctl
                          systemctl "--job-mode=ignore-dependencies" start crond.service
                          3⤵
                          • Enumerates kernel/hardware configuration
                          • Reads runtime system information
                          PID:682
                        • /bin/sh
                          /bin/sh -c "echo \"*/1 * * * * root /.mod \" >> /etc/crontab"
                          3⤵
                          • Creates/modifies Cron job
                          • Command and Scripting Interpreter: Unix Shell
                          PID:703
                        • /usr/bin/renice
                          renice -20 666
                          3⤵
                            PID:710
                          • /bin/mount
                            mount -o bind /tmp/ /proc/666
                            3⤵
                            • Reads runtime system information
                            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
                                    • Reads runtime system information
                                    PID:716
                                  • /bin/systemctl
                                    systemctl list-unit-files --full "--type=socket"
                                    4⤵
                                    • Enumerates kernel/hardware configuration
                                    • Reads runtime system information
                                    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
                                            • Reads runtime system information
                                            PID:713
                                          • /bin/systemctl
                                            systemctl start crond.service
                                            3⤵
                                            • Enumerates kernel/hardware configuration
                                            • Reads runtime system information
                                            PID:720
                                      • /etc/32676
                                        /etc/32676
                                        1⤵
                                        • Executes dropped EXE
                                        PID:681
                                        • /bin/sleep
                                          sleep 60
                                          2⤵
                                            PID:684
                                          • /etc/opt.services.cfg
                                            /etc/opt.services.cfg
                                            2⤵
                                            • Executes dropped EXE
                                            • Enumerates kernel/hardware configuration
                                            PID:829
                                            • /etc/opt.services.cfg
                                              /etc/opt.services.cfg " "
                                              3⤵
                                              • Executes dropped EXE
                                              • Enumerates kernel/hardware configuration
                                              PID:834
                                          • /bin/sleep
                                            sleep 60
                                            2⤵
                                              PID:835
                                            • /etc/opt.services.cfg
                                              /etc/opt.services.cfg
                                              2⤵
                                              • Executes dropped EXE
                                              • Enumerates kernel/hardware configuration
                                              PID:860
                                              • /etc/opt.services.cfg
                                                /etc/opt.services.cfg " "
                                                3⤵
                                                • Executes dropped EXE
                                                • Enumerates kernel/hardware configuration
                                                PID:864
                                            • /bin/sleep
                                              sleep 60
                                              2⤵
                                                PID:865

                                            Network

                                            MITRE ATT&CK Enterprise v15

                                            Replay Monitor

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                                            Downloads

                                            • /.mod

                                              Filesize

                                              34B

                                              MD5

                                              f5a3713282e43c200f30342f5ff5e2ea

                                              SHA1

                                              2b2ce1a207e2b691a074c6f78f71c4785aae426a

                                              SHA256

                                              6ab64e727571458d4884fb2fe82c27c467db0699cb8f648b3f0217c35d2b7511

                                              SHA512

                                              5bcb8cd360409147a486755f90e0cdd97183af02ce8de5135b7c6a8a010deb9ef12dcd5ee9a2a8fd2e159347f68e72d6b7fd75e943b4fcd928d7a74b97476013

                                            • /etc/.walk

                                              Filesize

                                              41B

                                              MD5

                                              bd5200042c2d93c06332794e70842aa3

                                              SHA1

                                              c1ed0f33ebe8c81f83893d3a7c11307807243114

                                              SHA256

                                              36365132b46f5a24a78d726ea48c64fb4ee15712e90a3d9ead78fd4ec9da34db

                                              SHA512

                                              6f85dc569cc94562bb693754467ecf50959720ad5210ce436b08c8169105a983adc23ef5daf851acb3618e078ab014c89c373cf88779621df86c3d6c8a56185b

                                            • /etc/.walk

                                              Filesize

                                              90B

                                              MD5

                                              165cd16149a4db6c9bac369094f58268

                                              SHA1

                                              ba97b130648042a2f0d1337474e9e7c94f512033

                                              SHA256

                                              ef735507a28452384d2dfcbb26e9e735ea1f2fa7898273e529714c1877bcdcc5

                                              SHA512

                                              618624ca3e53fa500ad0e93a23d3299c43731b3f0a5ec983182f5797ab64b5302104284f2c033af98a9573cc971c147e5072c58aca16beb3fdd85d5bafeb1560

                                            • /etc/32676

                                              Filesize

                                              61B

                                              MD5

                                              47684525bfdf26f49fd1cf742b17c015

                                              SHA1

                                              c4ab14ba22420ff9acadfc698a38d0cd99e9fbfa

                                              SHA256

                                              b7ce294613dd2c237a4a50548bfcd5c14d166107f2d2e965499bc78695300d5b

                                              SHA512

                                              948f9c519ae9afe1c821c5d58da2e584e50356dabef597ccd408853a9038560b9fb1c5894900e2725b48977ffd49d18a439436bb4946e2164ac9fcf2a8637621

                                            • /etc/opt.services.cfg

                                              Filesize

                                              2.0MB

                                              MD5

                                              639af202eb3c903183b8ae3d8ba4951e

                                              SHA1

                                              78ad606c247165cb75c4e349d9be702517203224

                                              SHA256

                                              668e2cdc076b620be68a4d5aa2ed14d2fa9b48b556f0e8f69548d8a972436155

                                              SHA512

                                              1eb84b880900795da9bb834e88422c8a81bd83f7fb0dcdf090f8b178b21e486e0010126bd249c84cf2b2f6dcad3fc0597acad073b299512fba8f9f02ef0c4767

                                            • /etc/profile.d/gateway.sh

                                              Filesize

                                              937B

                                              MD5

                                              dc6a9b4472df32de481b4167da1e6b2a

                                              SHA1

                                              d637ce0d6f1da12df1b1db75048483ad0880e2f6

                                              SHA256

                                              6edd780fb06a8238388aa1f757772ffe629eaf377d7a611a8aed1f994bf8dcc2

                                              SHA512

                                              46b3d2dc982bcadb78c811fa7dee33e17347319b512a2d7afa3463b122bef4fbde4754f406d369b536f06c5ee402e577ccdb2fe2af5ba128135bec136afd0760

                                            • /usr/bin/include/find

                                              Filesize

                                              134KB

                                              MD5

                                              138a27d6fe52fa1132760a4fa48922e0

                                              SHA1

                                              e0250e4d7bf33a5a1064344224148b889cb15138

                                              SHA256

                                              81a10dad907b23521461bd3fc83c2cedb2218933a328d9a05e3c9f6a9a1d42aa

                                              SHA512

                                              ee0078afad63fc2aaffdebb7127d1c7d4459287fee75358f57c82d397c39b7bf64338fb6996dfb1747cd9a896d714b3c76f0948727be91550f1affa1c0298a9e