Malware Analysis Report

2025-05-05 22:15

Sample ID 250418-bf868szlt2
Target 259800bf6d1eb21a74ff1737f9826a0a.bin
SHA256 1ac2ca656d2664e907d5349028c08a404bf98b3c97d3cfa1c7ef5187145142c1
Tags
kaiji defense_evasion discovery execution persistence privilege_escalation
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V16

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

1ac2ca656d2664e907d5349028c08a404bf98b3c97d3cfa1c7ef5187145142c1

Threat Level: Known bad

The file 259800bf6d1eb21a74ff1737f9826a0a.bin was found to be: Known bad.

Malicious Activity Summary

kaiji defense_evasion discovery execution persistence privilege_escalation

Kaiji

Kaiji family

Modifies Watchdog functionality

Executes dropped EXE

Write file to user bin folder

Modifies init.d

Creates/modifies Cron job

Modifies systemd

Creates/modifies environment variables

Modifies Bash startup script

Changes its process name

Enumerates kernel/hardware configuration

Reads runtime system information

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-04-18 01:06

Signatures

Kaiji

Description Indicator Process Target
N/A N/A N/A N/A

Kaiji family

kaiji

Analysis: behavioral1

Detonation Overview

Submitted

2025-04-18 01:06

Reported

2025-04-18 01:08

Platform

ubuntu2204-amd64-20250307-en

Max time kernel

148s

Max time network

143s

Command Line

[/tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf ]

Signatures

Kaiji

Description Indicator Process Target
N/A N/A N/A N/A

Kaiji family

kaiji

Executes dropped EXE

Description Indicator Process Target
N/A /etc/32676 /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Modifies Watchdog functionality

defense_evasion
Description Indicator Process Target
File opened for modification /dev/misc/watchdog /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /dev/watchdog /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Creates/modifies Cron job

execution persistence privilege_escalation
Description Indicator Process Target
File opened for modification /etc/crontab /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Creates/modifies environment variables

persistence privilege_escalation defense_evasion
Description Indicator Process Target
File opened for modification /etc/profile.d/bash_cfg /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/profile.d/bash_cfg.sh /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/profile.d/gateway.sh /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Modifies init.d

persistence
Description Indicator Process Target
File opened for modification /etc/init.d/rsync /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/ssh /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/apparmor /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/cryptdisks-early /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/keyboard-setup.sh /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/open-iscsi /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/x11-common /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/cron /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/cups-browsed /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/procps /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/spice-vdagent /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/acpid /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/alsa-utils /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/lvm2-lvmpolld /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/dbus /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/apport /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/bluetooth /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/cryptdisks /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/openvpn /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/sssd /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/unattended-upgrades /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/hwclock.sh /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/kmod /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/udev /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/anacron /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/avahi-daemon /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/iscsid /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/plymouth /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/console-setup.sh /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/gdm3 /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/saned /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/cups /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/init.d/plymouth-log /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Modifies systemd

persistence privilege_escalation
Description Indicator Process Target
File opened for modification /usr/lib/systemd/system/quotaoff.service /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Write file to user bin folder

persistence
Description Indicator Process Target
File opened for modification /usr/bin/include/dir /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/include/lsof /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/ps /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/ss /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/lsof /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/include/ps /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/include/ss /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/include/ls /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/include/find /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/ls /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/dir /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /usr/bin/find /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Modifies Bash startup script

persistence
Description Indicator Process Target
File opened for modification /etc/profile.d/bash_cfg /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/profile.d/bash_cfg.sh /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for modification /etc/profile.d/gateway.sh /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Changes its process name

Description Indicator Process Target
Changes the process name, possibly in an attempt to hide itself ksoftirqd/0 /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Enumerates kernel/hardware configuration

discovery
Description Indicator Process Target
File opened for reading /sys/kernel/mm/transparent_hugepage/hpage_pmd_size N/A N/A
File opened for reading /sys/kernel/mm/transparent_hugepage/hpage_pmd_size /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A

Reads runtime system information

discovery
Description Indicator Process Target
File opened for reading /proc/filesystems /usr/bin/systemctl N/A
File opened for reading /proc/filesystems /usr/bin/systemctl N/A
File opened for reading /proc/filesystems /usr/bin/sed N/A
File opened for reading /proc/filesystems /usr/bin/systemctl N/A
File opened for reading /proc/filesystems /usr/bin/systemctl N/A
File opened for reading /proc/filesystems /usr/bin/systemctl N/A
File opened for reading /proc/filesystems /usr/bin/journalctl N/A
File opened for reading /proc/filesystems /usr/bin/systemctl N/A
File opened for reading /proc/filesystems /usr/bin/systemctl N/A
File opened for reading /proc/filesystems /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf N/A
File opened for reading /proc/filesystems /usr/bin/sed N/A

Processes

/tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf

[/tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf ]

/etc/32676

[/etc/32676]

/usr/bin/basename

[basename /usr/sbin/service]

/usr/bin/sleep

[sleep 60]

/usr/bin/basename

[basename /usr/sbin/service]

/usr/bin/sed

[sed -ne s/\.socket\s*[a-z]*\s*$/.socket/p]

/usr/bin/systemctl

[systemctl list-unit-files --full --type=socket]

/usr/local/sbin/systemctl

[systemctl start crond.service]

/usr/local/bin/systemctl

[systemctl start crond.service]

/usr/sbin/systemctl

[systemctl start crond.service]

/usr/bin/systemctl

[systemctl start crond.service]

/usr/bin/systemctl

[systemctl daemon-reload]

/usr/bin/systemctl

[systemctl enable quotaoff.service]

/usr/bin/systemctl

[systemctl start quotaoff.service]

/usr/bin/journalctl

[journalctl -xe --no-pager]

/usr/bin/basename

[basename /usr/sbin/service]

/usr/bin/basename

[basename /usr/sbin/service]

/usr/bin/sed

[sed -ne s/\.socket\s*[a-z]*\s*$/.socket/p]

/usr/bin/systemctl

[systemctl list-unit-files --full --type=socket]

/usr/local/sbin/systemctl

[systemctl start cron.service]

/usr/local/bin/systemctl

[systemctl start cron.service]

/usr/sbin/systemctl

[systemctl start cron.service]

/usr/bin/systemctl

[systemctl start cron.service]

/usr/bin/sleep

[sleep 60]

/usr/bin/sleep

[sleep 60]

Network

Country Destination Domain Proto
N/A 224.0.0.251:5353 udp
US 8.8.8.8:53 www.google.com udp
US 8.8.8.8:53 www.google.com udp
US 154.40.47.248:888 tcp
US 154.40.47.248:888 tcp

Files

/etc/.walk

MD5 c43ed4fb3194f22b1bedfd47f952652f
SHA1 1c7ed537a42b5f25959c26d0fc0e1d34261fd3db
SHA256 66a5dbc04023a9236feb76957789d294222f876de8063ad97d32121a6c478d81
SHA512 0bee3e17dbb627c541247e9add297d9f51c87691c10e93d6fe369951c8034b4eee2adbb874977357951982f8d979e21d4d354403403d3ee335cd06e7a5b47e51

/etc/.walk

MD5 98ffb0516b1ce1d4e0620c46e66f28ed
SHA1 a8b7bc7822c3ee17868353624f8331bd52cb70db
SHA256 d5c21c9b54d54f17c1c2f079d55dc0c3f54b37dd86c0970827c334e891648b6d
SHA512 3f87d95063eaf4d3dd6842b4955527f2b36efba36995df6f2aadb7cb319741561945311ea8117e34e1141b3ae7d4d4d55c48cca6f513445fb42d8be6a995e763

/etc/32676

MD5 585f408444cbca746945f0cb63f2c3f0
SHA1 0e44bae17174f04514e770ca7fc4bec1007e39cd
SHA256 ebb961c647363dfa90f302de378e0e61807b9b792fc86616635a713cca8f4299
SHA512 022241dbafad55164701f67ef5b84154e3af97c5dfe77dee7bf8406f2befbd2962bbf4f243432b2f41d6c2376b87fcf551fd6945e03ddb02a5619c2f0f69c596

/boot/System.mod

MD5 259800bf6d1eb21a74ff1737f9826a0a
SHA1 1a13ffb1f327ae411689568840b0e812b7d40a59
SHA256 5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7
SHA512 d3b013396695920dde44c4bc8af2b91e9e4142592151056e27946af54096056f2a70d528c4fd9abb27042d6a5ed2839648fbe3054b3e8a218bf29586237c1beb

/usr/lib/systemd/system/quotaoff.service

MD5 b02de6cd28cd922b18d9d93375a70d8b
SHA1 021426a5a2ff9edc80ba5936c94b37525538885e
SHA256 d8d8e5cd33aa3450cd74c63716a02f3dff39efef2836559f110bc93663b1380a
SHA512 db3fe03ad5e599e6c03aaec7bf1242f5509fbb624adb9afb7499e25487daef3f3f1c6babf51570b527a5ac5c9f4b079ae4cc53baa9497c0a121328bef8d04422

/.mod

MD5 f5a3713282e43c200f30342f5ff5e2ea
SHA1 2b2ce1a207e2b691a074c6f78f71c4785aae426a
SHA256 6ab64e727571458d4884fb2fe82c27c467db0699cb8f648b3f0217c35d2b7511
SHA512 5bcb8cd360409147a486755f90e0cdd97183af02ce8de5135b7c6a8a010deb9ef12dcd5ee9a2a8fd2e159347f68e72d6b7fd75e943b4fcd928d7a74b97476013

/etc/profile.d/gateway.sh

MD5 2e31921004103525b2942afb1f95c164
SHA1 45ea67941d55c8db425324f097f0741147777a60
SHA256 ec9711c9e48409b0379845127f729e07b6dafd31a060069c9c91547d8b77621f
SHA512 b814d4259c559423137c32c6ea09ef2cac8b7d67654011b54c096cff726c2286719d7ac340085c169c92b84b993a09c76cbf6b54aae12bc038e20e15826b24df