Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    debian-9_armhf
  • resource
    debian9-armhf-20240418-en
  • resource tags

    arch:armhfimage:debian9-armhf-20240418-enkernel:4.9.0-13-armmp-lpaelocale:en-usos:debian-9-armhfsystem
  • submitted
    02-11-2024 04:07

General

  • Target

    linux_arm7.elf

  • Size

    2.0MB

  • MD5

    a3ae5faa01a7db12ab76104d756cffe4

  • SHA1

    976dcf62f67e5acc7dd97b81530e226532323104

  • SHA256

    9c176e91a4175ef8e14a6408ab340439f6eb0f3d12c0c38d34bfdc44e8e278cd

  • SHA512

    5b1b9bea5dfcffbc15594b5d6f035c5b435a7af6e1d99fe9b7357a4a6c34f17b3216be60cb6b5eee802c772863ea971ed70090fd7d357023aacb05aac8771654

  • SSDEEP

    24576:gNwGGRggwEGpD5IaZIJzIDgliOAMUh1Rskiq1zpQHCaRU7axVL0rKUk3dVh/cviW:VrcNoLn3z82T16

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/linux_arm7.elf
    /tmp/linux_arm7.elf
    1⤵
    • Enumerates kernel/hardware configuration
    PID:639
    • /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
      • Enumerates kernel/hardware configuration
      • Reads runtime system information
      PID:644
      • /bin/sh
        /bin/sh -c "/etc/32676&"
        3⤵
        • Command and Scripting Interpreter: Unix Shell
        PID:658
      • /usr/sbin/service
        service crond start
        3⤵
          PID:661
          • /usr/bin/basename
            basename /usr/sbin/service
            4⤵
              PID:663
            • /usr/bin/basename
              basename /usr/sbin/service
              4⤵
                PID:667
              • /bin/systemctl
                systemctl --quiet is-active multi-user.target
                4⤵
                • Enumerates kernel/hardware configuration
                • Reads runtime system information
                PID:670
              • /bin/systemctl
                systemctl list-unit-files --full "--type=socket"
                4⤵
                • Enumerates kernel/hardware configuration
                • Reads runtime system information
                PID:675
              • /bin/sed
                sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                4⤵
                • Reads runtime system information
                PID:676
            • /usr/local/sbin/systemctl
              systemctl "--job-mode=ignore-dependencies" start crond.service
              3⤵
                PID:661
              • /usr/local/bin/systemctl
                systemctl "--job-mode=ignore-dependencies" start crond.service
                3⤵
                  PID:661
                • /usr/sbin/systemctl
                  systemctl "--job-mode=ignore-dependencies" start crond.service
                  3⤵
                    PID:661
                  • /usr/bin/systemctl
                    systemctl "--job-mode=ignore-dependencies" start crond.service
                    3⤵
                      PID:661
                    • /sbin/systemctl
                      systemctl "--job-mode=ignore-dependencies" start crond.service
                      3⤵
                        PID:661
                      • /bin/systemctl
                        systemctl "--job-mode=ignore-dependencies" start crond.service
                        3⤵
                        • Enumerates kernel/hardware configuration
                        • Reads runtime system information
                        PID:661
                      • /bin/sh
                        /bin/sh -c "echo \"*/1 * * * * root /.mod \" >> /etc/crontab"
                        3⤵
                        • Creates/modifies Cron job
                        • Command and Scripting Interpreter: Unix Shell
                        PID:682
                      • /usr/bin/renice
                        renice -20 644
                        3⤵
                          PID:687
                        • /bin/mount
                          mount -o bind /tmp/ /proc/644
                          3⤵
                            PID:688
                          • /usr/sbin/service
                            service cron start
                            3⤵
                              PID:689
                              • /usr/bin/basename
                                basename /usr/sbin/service
                                4⤵
                                  PID:690
                                • /usr/bin/basename
                                  basename /usr/sbin/service
                                  4⤵
                                    PID:692
                                  • /bin/systemctl
                                    systemctl --quiet is-active multi-user.target
                                    4⤵
                                    • Enumerates kernel/hardware configuration
                                    • Reads runtime system information
                                    PID:693
                                  • /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 start cron.service
                                    3⤵
                                      PID:689
                                    • /usr/local/bin/systemctl
                                      systemctl start cron.service
                                      3⤵
                                        PID:689
                                      • /usr/sbin/systemctl
                                        systemctl start cron.service
                                        3⤵
                                          PID:689
                                        • /usr/bin/systemctl
                                          systemctl start cron.service
                                          3⤵
                                            PID:689
                                          • /sbin/systemctl
                                            systemctl start cron.service
                                            3⤵
                                              PID:689
                                            • /bin/systemctl
                                              systemctl start cron.service
                                              3⤵
                                              • Enumerates kernel/hardware configuration
                                              • Reads runtime system information
                                              PID:689
                                            • /bin/systemctl
                                              systemctl start crond.service
                                              3⤵
                                              • Enumerates kernel/hardware configuration
                                              • Reads runtime system information
                                              PID:697
                                        • /etc/32676
                                          /etc/32676
                                          1⤵
                                          • Executes dropped EXE
                                          PID:660
                                          • /bin/sleep
                                            sleep 60
                                            2⤵
                                              PID:664
                                            • /etc/opt.services.cfg
                                              /etc/opt.services.cfg
                                              2⤵
                                              • Executes dropped EXE
                                              • Enumerates kernel/hardware configuration
                                              PID:808
                                              • /etc/opt.services.cfg
                                                /etc/opt.services.cfg " "
                                                3⤵
                                                • Executes dropped EXE
                                                • Enumerates kernel/hardware configuration
                                                PID:812
                                            • /bin/sleep
                                              sleep 60
                                              2⤵
                                                PID:813
                                              • /etc/opt.services.cfg
                                                /etc/opt.services.cfg
                                                2⤵
                                                • Executes dropped EXE
                                                • Enumerates kernel/hardware configuration
                                                PID:840
                                                • /etc/opt.services.cfg
                                                  /etc/opt.services.cfg " "
                                                  3⤵
                                                  • Executes dropped EXE
                                                  • Enumerates kernel/hardware configuration
                                                  PID:844
                                              • /bin/sleep
                                                sleep 60
                                                2⤵
                                                  PID:845

                                              Network

                                              MITRE ATT&CK Enterprise v15

                                              Replay Monitor

                                              Loading Replay Monitor...

                                              Downloads

                                              • /.mod

                                                Filesize

                                                34B

                                                MD5

                                                f5a3713282e43c200f30342f5ff5e2ea

                                                SHA1

                                                2b2ce1a207e2b691a074c6f78f71c4785aae426a

                                                SHA256

                                                6ab64e727571458d4884fb2fe82c27c467db0699cb8f648b3f0217c35d2b7511

                                                SHA512

                                                5bcb8cd360409147a486755f90e0cdd97183af02ce8de5135b7c6a8a010deb9ef12dcd5ee9a2a8fd2e159347f68e72d6b7fd75e943b4fcd928d7a74b97476013

                                              • /etc/.walk

                                                Filesize

                                                41B

                                                MD5

                                                848e7c35a84718fa1f17fce23a005c21

                                                SHA1

                                                5e389e1a4ad4364a30b9a0912685f55cc639876c

                                                SHA256

                                                5957056ad849acd3b6f945cf0a81d137d9e82541648717626050a3698a36a8fc

                                                SHA512

                                                22511d179960b0465d7a7107861177930312a77881ef213edd017804b12402a741bb61e5b68446de95ee81c477ef8dce9f0299746db72edd0a3dbbb559c5b893

                                              • /etc/.walk

                                                Filesize

                                                90B

                                                MD5

                                                0bd10991da51342224d669a2ba87403a

                                                SHA1

                                                982e4866d12e58576ddd307b2d0b6ca25ec53473

                                                SHA256

                                                e013e3dd84120e3bd1f0555e322cec5c30383f4e05c8130cc6b77a111f9817fe

                                                SHA512

                                                c4534c7b0f75ee2c603deeaca2cbe5b7117e254cfbc2fa9867fac0c4bcbf81d7621a836c3dd19fe4e593e4fa2a5be6a74cdc3980c22e788ab5f7ea3301950389

                                              • /etc/32676

                                                Filesize

                                                61B

                                                MD5

                                                47684525bfdf26f49fd1cf742b17c015

                                                SHA1

                                                c4ab14ba22420ff9acadfc698a38d0cd99e9fbfa

                                                SHA256

                                                b7ce294613dd2c237a4a50548bfcd5c14d166107f2d2e965499bc78695300d5b

                                                SHA512

                                                948f9c519ae9afe1c821c5d58da2e584e50356dabef597ccd408853a9038560b9fb1c5894900e2725b48977ffd49d18a439436bb4946e2164ac9fcf2a8637621

                                              • /etc/opt.services.cfg

                                                Filesize

                                                2.0MB

                                                MD5

                                                a3ae5faa01a7db12ab76104d756cffe4

                                                SHA1

                                                976dcf62f67e5acc7dd97b81530e226532323104

                                                SHA256

                                                9c176e91a4175ef8e14a6408ab340439f6eb0f3d12c0c38d34bfdc44e8e278cd

                                                SHA512

                                                5b1b9bea5dfcffbc15594b5d6f035c5b435a7af6e1d99fe9b7357a4a6c34f17b3216be60cb6b5eee802c772863ea971ed70090fd7d357023aacb05aac8771654

                                              • /etc/profile.d/gateway.sh

                                                Filesize

                                                915B

                                                MD5

                                                5107c4303eba6c0fc770956d43b4c7e6

                                                SHA1

                                                f9444e5004eec5817f60449b232e9854607383f6

                                                SHA256

                                                5707914b73384c71d032b52535e6a4ddbd9cd92a612b15e86b43c417ff51b9a1

                                                SHA512

                                                99addcaa167ced119746184f17dc9cc94b46715bb4f20b241d86db2f1b6f339eae9000b014d75c48f3b18817ce8380d218be15c2464b1c0e15f4289fb180861d

                                              • /usr/bin/include/find

                                                Filesize

                                                134KB

                                                MD5

                                                138a27d6fe52fa1132760a4fa48922e0

                                                SHA1

                                                e0250e4d7bf33a5a1064344224148b889cb15138

                                                SHA256

                                                81a10dad907b23521461bd3fc83c2cedb2218933a328d9a05e3c9f6a9a1d42aa

                                                SHA512

                                                ee0078afad63fc2aaffdebb7127d1c7d4459287fee75358f57c82d397c39b7bf64338fb6996dfb1747cd9a896d714b3c76f0948727be91550f1affa1c0298a9e