Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    ubuntu-22.04_amd64
  • resource
    ubuntu2204-amd64-20250307-en
  • resource tags

    arch:amd64arch:i386image:ubuntu2204-amd64-20250307-enkernel:5.15.0-105-genericlocale:en-usos:ubuntu-22.04-amd64system
  • submitted
    19/04/2025, 18:49

General

  • Target

    linux_386.elf

  • Size

    5.0MB

  • MD5

    d21d21cb8de14e90f180b9c1f79276b3

  • SHA1

    b83ccf62b44343b28181924e5047fb034421e124

  • SHA256

    71ccac9d63fd1c2799963f5e5d87ee62f0c306741ae796dc4ea3777bdb0e8f09

  • SHA512

    5ba5ea34dbe8d8bf62a64640e86c449aa07153c5c4aac88a01db879829feb28f312cb5ad2869d3a0e3679c8159ebddbe7c863b439e4593a13960a1dcfcc00b3c

  • SSDEEP

    49152:uwybthh2kkjvF77Rn2o03wiEh4hgzRqtN9Tu+H+XfylvVt96CuajJpmhW16kDvrf:uwyRh7kzFkgzausxdaHY4A

Malware Config

Extracted

Family

kaiji

C2

2.59.151.111:8080

Signatures

  • Kaiji 1 IoCs

    Kaiji payload

  • Kaiji family
  • kaiji_chaosbot 1 IoCs

    Chaos-variant payload

  • 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 2 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 6 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.

  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

Processes

  • /etc/32678
    /etc/32678
    1⤵
      PID:1576
      • /usr/bin/sleep
        sleep 60
        2⤵
          PID:1579
      • /usr/bin/basename
        basename /usr/sbin/service
        1⤵
          PID:1578
        • /tmp/linux_386.elf
          /tmp/linux_386.elf " "
          1⤵
          • 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:1577
          • /usr/local/sbin/systemctl
            systemctl daemon-reload
            2⤵
              PID:1595
            • /usr/local/bin/systemctl
              systemctl daemon-reload
              2⤵
                PID:1595
              • /usr/sbin/systemctl
                systemctl daemon-reload
                2⤵
                  PID:1595
                • /usr/bin/systemctl
                  systemctl daemon-reload
                  2⤵
                  • Reads runtime system information
                  PID:1595
                • /usr/bin/systemctl
                  systemctl daemon-reload
                  2⤵
                  • Reads runtime system information
                  PID:1630
                • /usr/bin/systemctl
                  systemctl enable linux.service
                  2⤵
                  • Reads runtime system information
                  PID:1664
                • /usr/bin/systemctl
                  systemctl start linux.service
                  2⤵
                    PID:1698
                  • /usr/bin/journalctl
                    journalctl -xe --no-pager
                    2⤵
                      PID:1709
                    • /usr/bin/basename
                      basename /usr/sbin/service
                      2⤵
                        PID:1725
                      • /usr/bin/basename
                        basename /usr/sbin/service
                        2⤵
                          PID:1726
                        • /usr/bin/sed
                          sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                          2⤵
                            PID:1729
                          • /usr/bin/systemctl
                            systemctl list-unit-files --full "--type=socket"
                            2⤵
                            • Reads runtime system information
                            PID:1728
                          • /usr/local/sbin/systemctl
                            systemctl start cron.service
                            2⤵
                              PID:1724
                            • /usr/local/bin/systemctl
                              systemctl start cron.service
                              2⤵
                                PID:1724
                              • /usr/sbin/systemctl
                                systemctl start cron.service
                                2⤵
                                  PID:1724
                                • /usr/bin/systemctl
                                  systemctl start cron.service
                                  2⤵
                                    PID:1724
                                • /usr/bin/basename
                                  basename /usr/sbin/service
                                  1⤵
                                    PID:1580
                                  • /usr/bin/sed
                                    sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                    1⤵
                                      PID:1588
                                    • /usr/bin/systemctl
                                      systemctl list-unit-files --full "--type=socket"
                                      1⤵
                                      • Reads runtime system information
                                      PID:1587
                                    • /usr/local/sbin/systemctl
                                      systemctl start crond.service
                                      1⤵
                                        PID:1575
                                      • /usr/local/bin/systemctl
                                        systemctl start crond.service
                                        1⤵
                                          PID:1575
                                        • /usr/sbin/systemctl
                                          systemctl start crond.service
                                          1⤵
                                            PID:1575
                                          • /usr/bin/systemctl
                                            systemctl start crond.service
                                            1⤵
                                              PID:1575

                                            Network

                                            MITRE ATT&CK Enterprise v16

                                            Replay Monitor

                                            Loading Replay Monitor...

                                            Downloads

                                            • /.img

                                              Filesize

                                              33B

                                              MD5

                                              d73d3376908ea075a939e3871ad0fabe

                                              SHA1

                                              320ff65831247ba199515f1b94df26cc8a3e5f76

                                              SHA256

                                              edbdabe30d8236a2c0a4eb89dfd597552130e4c1a4e93f8fe1568920442ad73a

                                              SHA512

                                              57b83fef88620598beb5d65626bf757d0abef242d2d6a01796a61474dedc5095a4a9d0f292b6abb450cad3d4410ab8456253600f58ddb66cfe6d79e1c8415536

                                            • /boot/System.img.config

                                              Filesize

                                              5.0MB

                                              MD5

                                              d21d21cb8de14e90f180b9c1f79276b3

                                              SHA1

                                              b83ccf62b44343b28181924e5047fb034421e124

                                              SHA256

                                              71ccac9d63fd1c2799963f5e5d87ee62f0c306741ae796dc4ea3777bdb0e8f09

                                              SHA512

                                              5ba5ea34dbe8d8bf62a64640e86c449aa07153c5c4aac88a01db879829feb28f312cb5ad2869d3a0e3679c8159ebddbe7c863b439e4593a13960a1dcfcc00b3c

                                            • /etc/32678

                                              Filesize

                                              61B

                                              MD5

                                              768eaf287796da19e1cf5e0b2fb1b161

                                              SHA1

                                              6a1ce2ee5ccc86d1f33806feb14547b35290df2a

                                              SHA256

                                              1d22620dfb2a6715e5d745aed5cf841ede0e75e1747f12b9b925a2d346bc7ecb

                                              SHA512

                                              e6af30c9df4f7f47696069511e64ecbc8e841629d692ee4056503df3533fb7a7a74960698826260355e1dba7b6c562482a27a39bb51a4237473ce4b68472d620

                                            • /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