Overview

overview

10

Static

static

10

linux_amd64.elf

ubuntu-22.04-amd64

10

Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    ubuntu-22.04_amd64
  • resource
    ubuntu2204-amd64-20240611-en
  • resource tags

    arch:amd64arch:i386image:ubuntu2204-amd64-20240611-enkernel:5.15.0-105-genericlocale:en-usos:ubuntu-22.04-amd64system
  • submitted
    16-02-2025 16:07

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General

  • Target

    linux_amd64.elf

  • Size

    5.2MB

  • MD5

    645dd54b4f86542bc9bd64965576c6bc

  • SHA1

    50382f576e98dc1d4d35204cf1780fbc4b0d9b66

  • SHA256

    dc041ee1a2da8c8ba6e874f414d5b52a0237f39b2995890b56ac7fb173d86104

  • SHA512

    b8207db1e063382e8f165198e46f8cad92d2f204edef10a953fece5713fa9e7a99af479146891aa407abd2e6d328b940701f773bfada87ff0d10450814709042

  • SSDEEP

    49152:7Xa6xzZWhrb/T4vO90dL3BmAFd4A64nsfJPJ6TdXnT9aqeJaz2xNkapDnYRQoj1P:b2ONLBzSxtSTTElHz

Score
10/10
kaijidefense_evasiondiscoveryexecutionpersistenceprivilege_escalation

Malware Config

Extracted

Family

kaiji

C2

199.195.252.200:808

Signatures

  • Kaiji 1 IoCs

    Kaiji payload

  • Kaiji family
    kaiji
  • 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.

    defense_evasion
  • Creates/modifies Cron job 1 TTPs 1 IoCs

    Cron allows running tasks on a schedule, and is commonly used for malware persistence.

    executionpersistenceprivilege_escalation
  • Creates/modifies environment variables 1 TTPs 3 IoCs

    Creating/modifying environment variables is a common persistence mechanism.

    persistenceprivilege_escalationdefense_evasion
  • 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.

    persistence
  • Modifies systemd 2 TTPs 1 IoCs

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

    persistenceprivilege_escalation
  • Write file to user bin folder 6 IoCs
    persistence
  • Modifies Bash startup script 2 TTPs 3 IoCs
    persistence
  • Changes its process name 1 IoCs
  • Enumerates kernel/hardware configuration 1 TTPs 2 IoCs

    Reads contents of /sys virtual filesystem to enumerate system information.

    discovery
  • Reads runtime system information 64 IoCs

    Reads data from /proc virtual filesystem.

    discovery
  • GoLang User-Agent 1 IoCs

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

Processes

  • /tmp/linux_amd64.elf
    /tmp/linux_amd64.elf
    1⤵
    • Enumerates kernel/hardware configuration
    PID:1598
    • /usr/bin/sh
      sh -c "/etc/32678&"
      2⤵
      • Executes dropped EXE
      PID:1602
    • /usr/sbin/service
      service crond start
      2⤵
        PID:1603
        • /usr/bin/basename
          basename /usr/sbin/service
          3⤵
            PID:1606
          • /usr/bin/basename
            basename /usr/sbin/service
            3⤵
              PID:1617
            • /usr/bin/sed
              sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
              3⤵
              • Reads runtime system information
              PID:1620
            • /usr/bin/systemctl
              systemctl list-unit-files --full "--type=socket"
              3⤵
                PID:1619
            • /tmp/linux_amd64.elf
              /tmp/linux_amd64.elf " "
              2⤵
              • Modifies Watchdog functionality
              • 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:1605
              • /usr/sbin/update-rc.d
                update-rc.d linux_kill defaults
                3⤵
                  PID:1628
                  • /usr/local/sbin/systemctl
                    systemctl daemon-reload
                    4⤵
                      PID:1632
                    • /usr/local/bin/systemctl
                      systemctl daemon-reload
                      4⤵
                        PID:1632
                      • /usr/sbin/systemctl
                        systemctl daemon-reload
                        4⤵
                          PID:1632
                        • /usr/bin/systemctl
                          systemctl daemon-reload
                          4⤵
                            PID:1632
                        • /usr/bin/sh
                          sh -c "cd /boot;systemctl daemon-reload;systemctl enable linux.service;systemctl start linux.service;journalctl -xe --no-pager"
                          3⤵
                            PID:1666
                            • /usr/bin/systemctl
                              systemctl daemon-reload
                              4⤵
                              • Reads runtime system information
                              PID:1667
                            • /usr/bin/systemctl
                              systemctl enable linux.service
                              4⤵
                                PID:1707
                              • /usr/bin/systemctl
                                systemctl start linux.service
                                4⤵
                                • Reads runtime system information
                                PID:1741
                              • /usr/bin/journalctl
                                journalctl -xe --no-pager
                                4⤵
                                  PID:1752
                              • /usr/bin/sh
                                sh -c "cd /boot;ausearch -c 'System.img.conf' --raw | audit2allow -M my-Systemimgconf;semodule -X 300 -i my-Systemimgconf.pp"
                                3⤵
                                  PID:1760
                                • /usr/bin/bash
                                  bash -c "echo \"*/1 * * * * root /.img \" >> /etc/crontab"
                                  3⤵
                                  • Creates/modifies Cron job
                                  PID:1763
                                • /usr/bin/renice
                                  renice -20 1605
                                  3⤵
                                    PID:1764
                                  • /usr/bin/mount
                                    mount -o bind /tmp/ /proc/1605
                                    3⤵
                                      PID:1765
                                    • /usr/sbin/service
                                      service cron start
                                      3⤵
                                        PID:1767
                                        • /usr/bin/basename
                                          basename /usr/sbin/service
                                          4⤵
                                            PID:1768
                                          • /usr/bin/basename
                                            basename /usr/sbin/service
                                            4⤵
                                              PID:1769
                                            • /usr/bin/sed
                                              sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                              4⤵
                                                PID:1772
                                              • /usr/bin/systemctl
                                                systemctl list-unit-files --full "--type=socket"
                                                4⤵
                                                  PID:1771
                                              • /usr/local/sbin/systemctl
                                                systemctl start cron.service
                                                3⤵
                                                  PID:1767
                                                • /usr/local/bin/systemctl
                                                  systemctl start cron.service
                                                  3⤵
                                                    PID:1767
                                                  • /usr/sbin/systemctl
                                                    systemctl start cron.service
                                                    3⤵
                                                      PID:1767
                                                    • /usr/bin/systemctl
                                                      systemctl start cron.service
                                                      3⤵
                                                        PID:1767
                                                      • /usr/bin/systemctl
                                                        systemctl start crond.service
                                                        3⤵
                                                          PID:1773
                                                    • /etc/32678
                                                      /etc/32678
                                                      1⤵
                                                        PID:1604
                                                        • /usr/bin/sleep
                                                          sleep 60
                                                          2⤵
                                                            PID:1607
                                                        • /usr/local/sbin/systemctl
                                                          systemctl start crond.service
                                                          1⤵
                                                            PID:1603
                                                          • /usr/local/bin/systemctl
                                                            systemctl start crond.service
                                                            1⤵
                                                              PID:1603
                                                            • /usr/sbin/systemctl
                                                              systemctl start crond.service
                                                              1⤵
                                                                PID:1603
                                                              • /usr/bin/systemctl
                                                                systemctl start crond.service
                                                                1⤵
                                                                  PID:1603

                                                                Network

                                                                MITRE ATT&CK Enterprise v15

                                                                Reconnaissance

                                                                Resource Development

                                                                Initial Access

                                                                Execution

                                                                Scheduled Task/Job

                                                                1
                                                                T1053

                                                                Cron

                                                                1
                                                                T1053.003

                                                                Persistence

                                                                Boot or Logon Autostart Execution

                                                                3
                                                                T1547

                                                                XDG Autostart Entries

                                                                1
                                                                T1547.013

                                                                Boot or Logon Initialization Scripts

                                                                1
                                                                T1037

                                                                RC Scripts

                                                                1
                                                                T1037.004

                                                                Create or Modify System Process

                                                                1
                                                                T1543

                                                                Systemd Service

                                                                1
                                                                T1543.002

                                                                Event Triggered Execution

                                                                1
                                                                T1546

                                                                Unix Shell Configuration Modification

                                                                1
                                                                T1546.004

                                                                Hijack Execution Flow

                                                                1
                                                                T1574

                                                                Path Interception by PATH Environment Variable

                                                                1
                                                                T1574.007

                                                                Scheduled Task/Job

                                                                1
                                                                T1053

                                                                Cron

                                                                1
                                                                T1053.003

                                                                Privilege Escalation

                                                                Boot or Logon Autostart Execution

                                                                3
                                                                T1547

                                                                XDG Autostart Entries

                                                                1
                                                                T1547.013

                                                                Boot or Logon Initialization Scripts

                                                                1
                                                                T1037

                                                                RC Scripts

                                                                1
                                                                T1037.004

                                                                Create or Modify System Process

                                                                1
                                                                T1543

                                                                Systemd Service

                                                                1
                                                                T1543.002

                                                                Event Triggered Execution

                                                                1
                                                                T1546

                                                                Unix Shell Configuration Modification

                                                                1
                                                                T1546.004

                                                                Hijack Execution Flow

                                                                1
                                                                T1574

                                                                Path Interception by PATH Environment Variable

                                                                1
                                                                T1574.007

                                                                Scheduled Task/Job

                                                                1
                                                                T1053

                                                                Cron

                                                                1
                                                                T1053.003

                                                                Defense Evasion

                                                                Hijack Execution Flow

                                                                1
                                                                T1574

                                                                Path Interception by PATH Environment Variable

                                                                1
                                                                T1574.007

                                                                Impair Defenses

                                                                1
                                                                T1562

                                                                Credential Access

                                                                Discovery

                                                                System Information Discovery

                                                                1
                                                                T1082

                                                                Lateral Movement

                                                                Collection

                                                                Command and Control

                                                                Exfiltration

                                                                Impact

                                                                Replay Monitor

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                                                                Downloads

                                                                • /.img
                                                                  Filesize

                                                                  33B

                                                                  MD5

                                                                  d73d3376908ea075a939e3871ad0fabe

                                                                  SHA1

                                                                  320ff65831247ba199515f1b94df26cc8a3e5f76

                                                                  SHA256

                                                                  edbdabe30d8236a2c0a4eb89dfd597552130e4c1a4e93f8fe1568920442ad73a

                                                                  SHA512

                                                                  57b83fef88620598beb5d65626bf757d0abef242d2d6a01796a61474dedc5095a4a9d0f292b6abb450cad3d4410ab8456253600f58ddb66cfe6d79e1c8415536

                                                                  Download Submit

                                                                • /boot/System.img.config
                                                                  Filesize

                                                                  5.2MB

                                                                  MD5

                                                                  645dd54b4f86542bc9bd64965576c6bc

                                                                  SHA1

                                                                  50382f576e98dc1d4d35204cf1780fbc4b0d9b66

                                                                  SHA256

                                                                  dc041ee1a2da8c8ba6e874f414d5b52a0237f39b2995890b56ac7fb173d86104

                                                                  SHA512

                                                                  b8207db1e063382e8f165198e46f8cad92d2f204edef10a953fece5713fa9e7a99af479146891aa407abd2e6d328b940701f773bfada87ff0d10450814709042

                                                                  Download Submit

                                                                • /etc/32678
                                                                  Filesize

                                                                  61B

                                                                  MD5

                                                                  768eaf287796da19e1cf5e0b2fb1b161

                                                                  SHA1

                                                                  6a1ce2ee5ccc86d1f33806feb14547b35290df2a

                                                                  SHA256

                                                                  1d22620dfb2a6715e5d745aed5cf841ede0e75e1747f12b9b925a2d346bc7ecb

                                                                  SHA512

                                                                  e6af30c9df4f7f47696069511e64ecbc8e841629d692ee4056503df3533fb7a7a74960698826260355e1dba7b6c562482a27a39bb51a4237473ce4b68472d620

                                                                  Download Submit

                                                                • /etc/init.d/linux_kill
                                                                  Filesize

                                                                  189B

                                                                  MD5

                                                                  3909975f7cc0d1121c1819b800069f31

                                                                  SHA1

                                                                  3e68de708c2e6c40fab6794afdee3104e5590189

                                                                  SHA256

                                                                  6876dac71f13a068afb863d257134275f2edba43b2acaf4924fabf97c079070b

                                                                  SHA512

                                                                  50600cceeb03b05f45ae61d890caee9f51ff390b6776930866e527e071d65d08241fc66673fd9b99d62fbc77d3c00fc3de4d7378cbc42f5daba5d83072b0906e

                                                                  Download Submit

                                                                • /etc/profile.d/bash_config.sh
                                                                  Filesize

                                                                  37B

                                                                  MD5

                                                                  cfb4e51061485fe91169381fbdc1538e

                                                                  SHA1

                                                                  9a85b9b766a15b01737a41d680e4593b7a9bde87

                                                                  SHA256

                                                                  897f37267d0ceaa2fbdaa09847f5d08e6f8b01a0348a0d666264b0f10acd0c90

                                                                  SHA512

                                                                  fb154ec711d2090a7461da4db8ddad2b522649a27e74162ecb203f539b1729430288bc02d78d2071bde9c4bbc005693403a57612ef50277d52f816cb94524216

                                                                  Download Submit