Analysis

  • max time kernel
    148s
  • max time network
    146s
  • platform
    ubuntu-22.04_amd64
  • resource
    ubuntu2204-amd64-20250410-en
  • resource tags

    arch:amd64arch:i386image:ubuntu2204-amd64-20250410-enkernel:5.15.0-105-genericlocale:en-usos:ubuntu-22.04-amd64system
  • submitted
    16/04/2025, 18:41

General

  • Target

    linux_386.elf

  • Size

    1.8MB

  • MD5

    259800bf6d1eb21a74ff1737f9826a0a

  • SHA1

    1a13ffb1f327ae411689568840b0e812b7d40a59

  • SHA256

    5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7

  • SHA512

    d3b013396695920dde44c4bc8af2b91e9e4142592151056e27946af54096056f2a70d528c4fd9abb27042d6a5ed2839648fbe3054b3e8a218bf29586237c1beb

  • SSDEEP

    24576:Inoxw1zy7RvFMNRlnmxlJgAaI0ODBBri8wnJPVwchQItBPUgpxv2SzVVOMaWz1v:s/MBFBuEItpRpsSIWz1

Malware Config

Extracted

Family

kaiji

C2

154.40.47.248:809

Signatures

  • Kaiji 1 IoCs

    Kaiji payload

  • Kaiji family
  • Executes dropped EXE 1 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 33 IoCs

    Adds/modifies system service, likely for persistence.

  • Modifies systemd 2 TTPs 1 IoCs

    Adds/ modifies systemd service files. Likely to achieve persistence.

  • Write file to user bin folder 12 IoCs
  • Modifies Bash startup script 2 TTPs 3 IoCs
  • Changes its process name 1 IoCs
  • Enumerates kernel/hardware configuration 1 TTPs 2 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_386.elf
    /tmp/linux_386.elf " "
    1⤵
    • Executes dropped EXE
    • Modifies Watchdog functionality
    • Creates/modifies Cron job
    • Creates/modifies environment variables
    • Modifies init.d
    • Modifies systemd
    • Write file to user bin folder
    • Modifies Bash startup script
    • Changes its process name
    • Enumerates kernel/hardware configuration
    • Reads runtime system information
    PID:1567
    • /usr/bin/basename
      basename /usr/sbin/service
      2⤵
        PID:1575
      • /usr/bin/basename
        basename /usr/sbin/service
        2⤵
          PID:1576
        • /usr/bin/sed
          sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
          2⤵
          • Reads runtime system information
          PID:1579
        • /usr/bin/systemctl
          systemctl list-unit-files --full "--type=socket"
          2⤵
            PID:1578
          • /usr/local/sbin/systemctl
            systemctl start crond.service
            2⤵
              PID:1573
            • /usr/local/bin/systemctl
              systemctl start crond.service
              2⤵
                PID:1573
              • /usr/sbin/systemctl
                systemctl start crond.service
                2⤵
                  PID:1573
                • /usr/bin/systemctl
                  systemctl start crond.service
                  2⤵
                    PID:1573
                  • /usr/bin/systemctl
                    systemctl daemon-reload
                    2⤵
                      PID:1584
                    • /usr/bin/systemctl
                      systemctl enable quotaoff.service
                      2⤵
                        PID:1618
                      • /usr/bin/systemctl
                        systemctl start quotaoff.service
                        2⤵
                        • Reads runtime system information
                        PID:1654
                      • /usr/bin/journalctl
                        journalctl -xe --no-pager
                        2⤵
                        • Reads runtime system information
                        PID:1676
                      • /usr/bin/basename
                        basename /usr/sbin/service
                        2⤵
                          PID:1685
                        • /usr/bin/basename
                          basename /usr/sbin/service
                          2⤵
                            PID:1686
                          • /usr/bin/sed
                            sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                            2⤵
                            • Reads runtime system information
                            PID:1689
                          • /usr/bin/systemctl
                            systemctl list-unit-files --full "--type=socket"
                            2⤵
                            • Reads runtime system information
                            PID:1688
                          • /usr/local/sbin/systemctl
                            systemctl start cron.service
                            2⤵
                              PID:1684
                            • /usr/local/bin/systemctl
                              systemctl start cron.service
                              2⤵
                                PID:1684
                              • /usr/sbin/systemctl
                                systemctl start cron.service
                                2⤵
                                  PID:1684
                                • /usr/bin/systemctl
                                  systemctl start cron.service
                                  2⤵
                                    PID:1684
                                • /etc/32676
                                  /etc/32676
                                  1⤵
                                    PID:1572
                                    • /usr/bin/sleep
                                      sleep 60
                                      2⤵
                                        PID:1574
                                      • /usr/bin/sleep
                                        sleep 60
                                        2⤵
                                          PID:1772
                                        • /usr/bin/sleep
                                          sleep 60
                                          2⤵
                                            PID:1787

                                        Network

                                        MITRE ATT&CK Enterprise v16

                                        Replay Monitor

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                                        Downloads

                                        • /.mod

                                          Filesize

                                          34B

                                          MD5

                                          f5a3713282e43c200f30342f5ff5e2ea

                                          SHA1

                                          2b2ce1a207e2b691a074c6f78f71c4785aae426a

                                          SHA256

                                          6ab64e727571458d4884fb2fe82c27c467db0699cb8f648b3f0217c35d2b7511

                                          SHA512

                                          5bcb8cd360409147a486755f90e0cdd97183af02ce8de5135b7c6a8a010deb9ef12dcd5ee9a2a8fd2e159347f68e72d6b7fd75e943b4fcd928d7a74b97476013

                                        • /boot/System.mod

                                          Filesize

                                          1.8MB

                                          MD5

                                          259800bf6d1eb21a74ff1737f9826a0a

                                          SHA1

                                          1a13ffb1f327ae411689568840b0e812b7d40a59

                                          SHA256

                                          5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7

                                          SHA512

                                          d3b013396695920dde44c4bc8af2b91e9e4142592151056e27946af54096056f2a70d528c4fd9abb27042d6a5ed2839648fbe3054b3e8a218bf29586237c1beb

                                        • /etc/.walk

                                          Filesize

                                          49B

                                          MD5

                                          be61c2bc8a19feeea95e41d0e94962fd

                                          SHA1

                                          b6c8e9a0a0cbf3e798f1e6669508bc7e9ad43173

                                          SHA256

                                          edb1c48d5c2a89d9e1a570967cf2dff861485814636c1c4a26bf4ee6dbe402e1

                                          SHA512

                                          e229c10ac49bf73a846ed9a58fa4fdb6e49a8cc07209094b92a2bf9bc6b72954c68c129800e4c356a7c7b383a8a5fe70d0401eafa8cb1382142778303179c6ac

                                        • /etc/.walk

                                          Filesize

                                          98B

                                          MD5

                                          7fb437af67907135c8eb965295be8ea2

                                          SHA1

                                          325692899cabcbb1fbf3ecb751f53ca78db88436

                                          SHA256

                                          69b3cbc38cafc06e2a36e10cec346941953745563e2239d6284bd38bb0b1b5e7

                                          SHA512

                                          c7eb8050562741c375a13b1076dc6e2cbb3533541f33222b09db0a9bd8cd02b8a1932566d53e5b2822d6b21feb2cf94ba0695b7bd9d6902874b1acfacf3ff2a8

                                        • /etc/32676

                                          Filesize

                                          56B

                                          MD5

                                          585f408444cbca746945f0cb63f2c3f0

                                          SHA1

                                          0e44bae17174f04514e770ca7fc4bec1007e39cd

                                          SHA256

                                          ebb961c647363dfa90f302de378e0e61807b9b792fc86616635a713cca8f4299

                                          SHA512

                                          022241dbafad55164701f67ef5b84154e3af97c5dfe77dee7bf8406f2befbd2962bbf4f243432b2f41d6c2376b87fcf551fd6945e03ddb02a5619c2f0f69c596

                                        • /etc/profile.d/gateway.sh

                                          Filesize

                                          5KB

                                          MD5

                                          f2b1f3db600ea068846bf5937f3f0ea4

                                          SHA1

                                          ec98496f6cfbd295a9679a912f3d75a72e1183fe

                                          SHA256

                                          bd6a2dbd29257d09768bc45cbbd3a75fbafe26f49f8d1487ac35644cb7a53e47

                                          SHA512

                                          7cc944508882ea9bf98c7f6e7d86394410fc273643430422d267595d498a919999e5ca939d90f4fdc81a69201b83cd1a687a7ffa9f4f671799fb5a0a6ea294be

                                        • /usr/lib/systemd/system/quotaoff.service

                                          Filesize

                                          186B

                                          MD5

                                          b02de6cd28cd922b18d9d93375a70d8b

                                          SHA1

                                          021426a5a2ff9edc80ba5936c94b37525538885e

                                          SHA256

                                          d8d8e5cd33aa3450cd74c63716a02f3dff39efef2836559f110bc93663b1380a

                                          SHA512

                                          db3fe03ad5e599e6c03aaec7bf1242f5509fbb624adb9afb7499e25487daef3f3f1c6babf51570b527a5ac5c9f4b079ae4cc53baa9497c0a121328bef8d04422