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
    03-11-2024 02:51

General

  • Target

    5b1c5fca09994aa52e8e572d48c6569b04b531cd334f3e4d4e1fc2c3e77ce0cf.elf

  • Size

    2.0MB

  • MD5

    790576a357429568ac84093b6f785f3a

  • SHA1

    b8a5de8ce8570856744717b9872afa7546c5a01e

  • SHA256

    5b1c5fca09994aa52e8e572d48c6569b04b531cd334f3e4d4e1fc2c3e77ce0cf

  • SHA512

    245af8ba5b83069bb51d11735545dd72c9dafad667fc4ba3a2e19f9de254df8ce8ee21f003bfa2487553ffe4639a64a6aa729fe6e75d96345cf53c6bc43e500c

  • SSDEEP

    24576:JgCbFbDVZ7bVCj3ozPQPTUkrtQ05OYRWNOrdErF4ff1kRrxnyVhv8uofvsRWA1SH:VCWpuM2T1s

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/5b1c5fca09994aa52e8e572d48c6569b04b531cd334f3e4d4e1fc2c3e77ce0cf.elf
    /tmp/5b1c5fca09994aa52e8e572d48c6569b04b531cd334f3e4d4e1fc2c3e77ce0cf.elf
    1⤵
    • Enumerates kernel/hardware configuration
    PID:663
    • /tmp/5b1c5fca09994aa52e8e572d48c6569b04b531cd334f3e4d4e1fc2c3e77ce0cf.elf
      /tmp/5b1c5fca09994aa52e8e572d48c6569b04b531cd334f3e4d4e1fc2c3e77ce0cf.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:672
      • /bin/sh
        /bin/sh -c "/etc/32676&"
        3⤵
        • Command and Scripting Interpreter: Unix Shell
        PID:683
      • /usr/sbin/service
        service crond start
        3⤵
          PID:686
          • /usr/bin/basename
            basename /usr/sbin/service
            4⤵
              PID:689
            • /usr/bin/basename
              basename /usr/sbin/service
              4⤵
                PID:691
              • /bin/systemctl
                systemctl --quiet is-active multi-user.target
                4⤵
                • Enumerates kernel/hardware configuration
                • Reads runtime system information
                PID:693
              • /bin/systemctl
                systemctl list-unit-files --full "--type=socket"
                4⤵
                • Enumerates kernel/hardware configuration
                • Reads runtime system information
                PID:698
              • /bin/sed
                sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                4⤵
                • Reads runtime system information
                PID:699
            • /usr/local/sbin/systemctl
              systemctl "--job-mode=ignore-dependencies" start crond.service
              3⤵
                PID:686
              • /usr/local/bin/systemctl
                systemctl "--job-mode=ignore-dependencies" start crond.service
                3⤵
                  PID:686
                • /usr/sbin/systemctl
                  systemctl "--job-mode=ignore-dependencies" start crond.service
                  3⤵
                    PID:686
                  • /usr/bin/systemctl
                    systemctl "--job-mode=ignore-dependencies" start crond.service
                    3⤵
                      PID:686
                    • /sbin/systemctl
                      systemctl "--job-mode=ignore-dependencies" start crond.service
                      3⤵
                        PID:686
                      • /bin/systemctl
                        systemctl "--job-mode=ignore-dependencies" start crond.service
                        3⤵
                        • Enumerates kernel/hardware configuration
                        • Reads runtime system information
                        PID:686
                      • /bin/sh
                        /bin/sh -c "echo \"*/1 * * * * root /.mod \" >> /etc/crontab"
                        3⤵
                        • Creates/modifies Cron job
                        • Command and Scripting Interpreter: Unix Shell
                        PID:706
                      • /usr/bin/renice
                        renice -20 672
                        3⤵
                          PID:709
                        • /bin/mount
                          mount -o bind /tmp/ /proc/672
                          3⤵
                          • Reads runtime system information
                          PID:711
                        • /usr/sbin/service
                          service cron start
                          3⤵
                            PID:712
                            • /usr/bin/basename
                              basename /usr/sbin/service
                              4⤵
                                PID:713
                              • /usr/bin/basename
                                basename /usr/sbin/service
                                4⤵
                                  PID:714
                                • /bin/systemctl
                                  systemctl --quiet is-active multi-user.target
                                  4⤵
                                  • Enumerates kernel/hardware configuration
                                  • Reads runtime system information
                                  PID:715
                                • /bin/systemctl
                                  systemctl list-unit-files --full "--type=socket"
                                  4⤵
                                  • Enumerates kernel/hardware configuration
                                  • Reads runtime system information
                                  PID:717
                                • /bin/sed
                                  sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                  4⤵
                                  • Reads runtime system information
                                  PID:718
                              • /usr/local/sbin/systemctl
                                systemctl "--job-mode=ignore-dependencies" start cron.service
                                3⤵
                                  PID:712
                                • /usr/local/bin/systemctl
                                  systemctl "--job-mode=ignore-dependencies" start cron.service
                                  3⤵
                                    PID:712
                                  • /usr/sbin/systemctl
                                    systemctl "--job-mode=ignore-dependencies" start cron.service
                                    3⤵
                                      PID:712
                                    • /usr/bin/systemctl
                                      systemctl "--job-mode=ignore-dependencies" start cron.service
                                      3⤵
                                        PID:712
                                      • /sbin/systemctl
                                        systemctl "--job-mode=ignore-dependencies" start cron.service
                                        3⤵
                                          PID:712
                                        • /bin/systemctl
                                          systemctl "--job-mode=ignore-dependencies" start cron.service
                                          3⤵
                                          • Enumerates kernel/hardware configuration
                                          • Reads runtime system information
                                          PID:712
                                        • /bin/systemctl
                                          systemctl start crond.service
                                          3⤵
                                          • Enumerates kernel/hardware configuration
                                          • Reads runtime system information
                                          PID:719
                                    • /etc/32676
                                      /etc/32676
                                      1⤵
                                      • Executes dropped EXE
                                      PID:685
                                      • /bin/sleep
                                        sleep 60
                                        2⤵
                                          PID:688
                                        • /etc/opt.services.cfg
                                          /etc/opt.services.cfg
                                          2⤵
                                          • Executes dropped EXE
                                          • Enumerates kernel/hardware configuration
                                          PID:831
                                          • /etc/opt.services.cfg
                                            /etc/opt.services.cfg " "
                                            3⤵
                                            • Executes dropped EXE
                                            • Enumerates kernel/hardware configuration
                                            PID:835
                                        • /bin/sleep
                                          sleep 60
                                          2⤵
                                            PID:836
                                          • /etc/opt.services.cfg
                                            /etc/opt.services.cfg
                                            2⤵
                                            • Executes dropped EXE
                                            • Enumerates kernel/hardware configuration
                                            PID:864
                                            • /etc/opt.services.cfg
                                              /etc/opt.services.cfg " "
                                              3⤵
                                              • Executes dropped EXE
                                              • Enumerates kernel/hardware configuration
                                              PID:868
                                          • /bin/sleep
                                            sleep 60
                                            2⤵
                                              PID:869

                                          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

                                            3e1d74bd686afbf77d0f9d5b77c0ea9c

                                            SHA1

                                            64ccc7e067c42f09965fa76321508d8a32ad9d45

                                            SHA256

                                            f54a9abd0cdefbfeacd0b7b4a37c3931184096b548c7794ebf0ecc8a19a93ca1

                                            SHA512

                                            4da32baf8a55bb578cfd276bea8bacb68fd99cd4d7129e17f6c32645a21e17944164d945a682539c702d1266d8f149268b6c1470376b234bf56d9ce58951a117

                                          • /etc/.walk

                                            Filesize

                                            90B

                                            MD5

                                            5b45c2aa481c7bb2f665a585b15e8644

                                            SHA1

                                            b1917a98723e77824a7d0e3e32f6f8fd60740c37

                                            SHA256

                                            1281cb800a02b87ff21d2f1465c4bdc85caf324e428133758bc3dab7db4f96f0

                                            SHA512

                                            b36d2ddffa139949e0809d93449e011a6e53aaed3fdb98c1bc9519e4931eed79f6514e98a170b3d92502956d47c93adb0735b9bef9911e33e66c78111b58ad21

                                          • /etc/32676

                                            Filesize

                                            61B

                                            MD5

                                            47684525bfdf26f49fd1cf742b17c015

                                            SHA1

                                            c4ab14ba22420ff9acadfc698a38d0cd99e9fbfa

                                            SHA256

                                            b7ce294613dd2c237a4a50548bfcd5c14d166107f2d2e965499bc78695300d5b

                                            SHA512

                                            948f9c519ae9afe1c821c5d58da2e584e50356dabef597ccd408853a9038560b9fb1c5894900e2725b48977ffd49d18a439436bb4946e2164ac9fcf2a8637621

                                          • /etc/opt.services.cfg

                                            Filesize

                                            2.0MB

                                            MD5

                                            790576a357429568ac84093b6f785f3a

                                            SHA1

                                            b8a5de8ce8570856744717b9872afa7546c5a01e

                                            SHA256

                                            5b1c5fca09994aa52e8e572d48c6569b04b531cd334f3e4d4e1fc2c3e77ce0cf

                                            SHA512

                                            245af8ba5b83069bb51d11735545dd72c9dafad667fc4ba3a2e19f9de254df8ce8ee21f003bfa2487553ffe4639a64a6aa729fe6e75d96345cf53c6bc43e500c

                                          • /etc/profile.d/gateway.sh

                                            Filesize

                                            969B

                                            MD5

                                            0e25d4ef58442ed4063c1c878e2ddf7a

                                            SHA1

                                            8f7ac18d2c32725ad4ad98b9222b87cae9e0906e

                                            SHA256

                                            820875bf1d8ba790245c4b9e8f4804272856147fa0367c0a553ed23916bc117e

                                            SHA512

                                            1a12290dc73c5068542560f948ec7fa66d333355a50943931dcac5b6137807aea76b9a1eb6e19c4740acd4ff59fd97a055b780c1d998592e1efa669235ed32f6

                                          • /usr/bin/include/find

                                            Filesize

                                            134KB

                                            MD5

                                            138a27d6fe52fa1132760a4fa48922e0

                                            SHA1

                                            e0250e4d7bf33a5a1064344224148b889cb15138

                                            SHA256

                                            81a10dad907b23521461bd3fc83c2cedb2218933a328d9a05e3c9f6a9a1d42aa

                                            SHA512

                                            ee0078afad63fc2aaffdebb7127d1c7d4459287fee75358f57c82d397c39b7bf64338fb6996dfb1747cd9a896d714b3c76f0948727be91550f1affa1c0298a9e