Overview

overview

10

Static

static

10

linux_386.elf

ubuntu-22.04-amd64

10

Analysis

  • max time kernel
    149s
  • max time network
    150s
  • 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
    20/03/2025, 23:26

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General

  • Target

    linux_386.elf

  • Size

    5.0MB

  • MD5

    21ef8d4e6816e58f43beb0aee2422366

  • SHA1

    0fcb6e72f604ab6e2afef0a40433b06a29c373bb

  • SHA256

    e353d704ff45ff8513fa0ce6685d6dcb84cf7921f6173a935c9a312cde206631

  • SHA512

    e091ba1d17ca25af8718114884fa6c0724bc08c561df2adc80d4994eeb37ee2a16000c07c3bf91429c17a800e1af993a12f2a5be0696cb1459f86fdc0a7c8f3b

  • SSDEEP

    49152:E33d0lGt6UHcFL7Rn2o03wiEhiDmzzd/9sARlBs/00Cpfx9a9uN+p9hW16klbU6V:E33GlbU8FwmzzRDZ9mpqRV

Score
10/10
kaijidefense_evasiondiscoveryexecutionpersistenceprivilege_escalation

Malware Config

Extracted

Family

kaiji

C2

156.225.31.175:808

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

  • /etc/32678
    /etc/32678
    1⤵
      PID:1573
      • /usr/bin/sleep
        sleep 60
        2⤵
          PID:1576
      • /usr/bin/basename
        basename /usr/sbin/service
        1⤵
          PID:1575
        • /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:1574
          • /usr/local/sbin/systemctl
            systemctl daemon-reload
            2⤵
              PID:1592
            • /usr/local/bin/systemctl
              systemctl daemon-reload
              2⤵
                PID:1592
              • /usr/sbin/systemctl
                systemctl daemon-reload
                2⤵
                  PID:1592
                • /usr/bin/systemctl
                  systemctl daemon-reload
                  2⤵
                    PID:1592
                  • /usr/bin/systemctl
                    systemctl daemon-reload
                    2⤵
                      PID:1627
                    • /usr/bin/systemctl
                      systemctl enable linux.service
                      2⤵
                      • Reads runtime system information
                      PID:1661
                    • /usr/bin/systemctl
                      systemctl start linux.service
                      2⤵
                        PID:1695
                      • /usr/bin/journalctl
                        journalctl -xe --no-pager
                        2⤵
                          PID:1706
                        • /usr/bin/basename
                          basename /usr/sbin/service
                          2⤵
                            PID:1722
                          • /usr/bin/basename
                            basename /usr/sbin/service
                            2⤵
                              PID:1723
                            • /usr/bin/systemctl
                              systemctl list-unit-files --full "--type=socket"
                              2⤵
                                PID:1725
                              • /usr/bin/sed
                                sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                2⤵
                                  PID:1726
                                • /usr/local/sbin/systemctl
                                  systemctl start cron.service
                                  2⤵
                                    PID:1721
                                  • /usr/local/bin/systemctl
                                    systemctl start cron.service
                                    2⤵
                                      PID:1721
                                    • /usr/sbin/systemctl
                                      systemctl start cron.service
                                      2⤵
                                        PID:1721
                                      • /usr/bin/systemctl
                                        systemctl start cron.service
                                        2⤵
                                        • Reads runtime system information
                                        PID:1721
                                    • /usr/bin/basename
                                      basename /usr/sbin/service
                                      1⤵
                                        PID:1577
                                      • /usr/bin/sed
                                        sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
                                        1⤵
                                          PID:1586
                                        • /usr/bin/systemctl
                                          systemctl list-unit-files --full "--type=socket"
                                          1⤵
                                            PID:1585
                                          • /usr/local/sbin/systemctl
                                            systemctl start crond.service
                                            1⤵
                                              PID:1572
                                            • /usr/local/bin/systemctl
                                              systemctl start crond.service
                                              1⤵
                                                PID:1572
                                              • /usr/sbin/systemctl
                                                systemctl start crond.service
                                                1⤵
                                                  PID:1572
                                                • /usr/bin/systemctl
                                                  systemctl start crond.service
                                                  1⤵
                                                    PID:1572

                                                  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

                                                    5.0MB

                                                    MD5

                                                    21ef8d4e6816e58f43beb0aee2422366

                                                    SHA1

                                                    0fcb6e72f604ab6e2afef0a40433b06a29c373bb

                                                    SHA256

                                                    e353d704ff45ff8513fa0ce6685d6dcb84cf7921f6173a935c9a312cde206631

                                                    SHA512

                                                    e091ba1d17ca25af8718114884fa6c0724bc08c561df2adc80d4994eeb37ee2a16000c07c3bf91429c17a800e1af993a12f2a5be0696cb1459f86fdc0a7c8f3b

                                                    Download Submit

                                                  • /etc/32678
                                                    Filesize

                                                    61B

                                                    MD5

                                                    768eaf287796da19e1cf5e0b2fb1b161

                                                    SHA1

                                                    6a1ce2ee5ccc86d1f33806feb14547b35290df2a

                                                    SHA256

                                                    1d22620dfb2a6715e5d745aed5cf841ede0e75e1747f12b9b925a2d346bc7ecb

                                                    SHA512

                                                    e6af30c9df4f7f47696069511e64ecbc8e841629d692ee4056503df3533fb7a7a74960698826260355e1dba7b6c562482a27a39bb51a4237473ce4b68472d620

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                                                  • /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