Analysis Overview
SHA256
c09b6758cad544622f1a8a0e5edb64af4b952eb95ae94dcfe20fc1af2a9ab7e4
Threat Level: Known bad
The file linux_amd64.elf was found to be: Known bad.
Malicious Activity Summary
Kaiji
Kaiji family
Modifies Watchdog functionality
Executes dropped EXE
Modifies systemd
Write file to user bin folder
Modifies init.d
Creates/modifies Cron job
Creates/modifies environment variables
Enumerates running processes
Modifies Bash startup script
Changes its process name
Command and Scripting Interpreter: Unix Shell
Enumerates kernel/hardware configuration
Reads runtime system information
MITRE ATT&CK
Enterprise Matrix V16
Analysis: static1
Detonation Overview
Reported
2025-04-16 18:45
Signatures
Kaiji
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Kaiji family
Analysis: behavioral1
Detonation Overview
Submitted
2025-04-16 18:45
Reported
2025-04-16 18:47
Platform
ubuntu2204-amd64-20250410-en
Max time kernel
148s
Max time network
147s
Command Line
Signatures
Kaiji
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Kaiji family
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | /etc/32676 | /bin/sh | N/A |
Modifies Watchdog functionality
| Description | Indicator | Process | Target |
| File opened for modification | /dev/watchdog | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /dev/misc/watchdog | /tmp/linux_amd64.elf | N/A |
Creates/modifies Cron job
| Description | Indicator | Process | Target |
| File opened for modification | /etc/crontab | /bin/sh | N/A |
Creates/modifies environment variables
| Description | Indicator | Process | Target |
| File opened for modification | /etc/profile.d/bash_cfg | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/profile.d/bash_cfg.sh | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/profile.d/gateway.sh | /tmp/linux_amd64.elf | N/A |
Enumerates running processes
Modifies init.d
| Description | Indicator | Process | Target |
| File opened for modification | /etc/init.d/plymouth | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/anacron | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/apparmor | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/kmod | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/cryptdisks | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/hwclock.sh | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/lvm2-lvmpolld | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/sssd | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/acpid | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/alsa-utils | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/iscsid | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/open-iscsi | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/procps | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/ssh | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/unattended-upgrades | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/apport | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/bluetooth | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/cryptdisks-early | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/cups-browsed | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/udev | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/avahi-daemon | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/keyboard-setup.sh | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/rsync | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/x11-common | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/cron | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/plymouth-log | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/spice-vdagent | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/console-setup.sh | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/dbus | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/saned | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/cups | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/gdm3 | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/init.d/openvpn | /tmp/linux_amd64.elf | N/A |
Modifies systemd
| Description | Indicator | Process | Target |
| File opened for modification | /usr/lib/systemd/system/quotaoff.service | /tmp/linux_amd64.elf | N/A |
Write file to user bin folder
| Description | Indicator | Process | Target |
| File opened for modification | /usr/bin/include/ps | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/include/ss | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/include/ls | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/include/find | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/dir | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/include/dir | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/include/lsof | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/ps | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/ss | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/ls | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/find | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /usr/bin/lsof | /tmp/linux_amd64.elf | N/A |
Modifies Bash startup script
| Description | Indicator | Process | Target |
| File opened for modification | /etc/profile.d/bash_cfg | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/profile.d/bash_cfg.sh | /tmp/linux_amd64.elf | N/A |
| File opened for modification | /etc/profile.d/gateway.sh | /tmp/linux_amd64.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/linux_amd64.elf | N/A |
Command and Scripting Interpreter: Unix Shell
| Description | Indicator | Process | Target |
| N/A | N/A | /bin/sh | N/A |
| N/A | N/A | /bin/sh | N/A |
| N/A | N/A | /bin/sh | N/A |
| N/A | N/A | /bin/sh | N/A |
Enumerates kernel/hardware configuration
| Description | Indicator | Process | Target |
| File opened for reading | /sys/kernel/mm/transparent_hugepage/hpage_pmd_size | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /sys/kernel/mm/transparent_hugepage/hpage_pmd_size | /tmp/linux_amd64.elf | N/A |
Reads runtime system information
| Description | Indicator | Process | Target |
| File opened for reading | /proc/1737/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/556/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1587/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/774/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1080/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1178/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1220/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/filesystems | /usr/bin/systemctl | N/A |
| File opened for reading | /proc/680/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/799/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1381/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1199/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/788/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1097/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1228/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/filesystems | /usr/bin/systemctl | N/A |
| File opened for reading | /proc/666/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/973/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1032/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1096/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/413/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/915/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1094/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1512/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/filesystems | /usr/bin/systemctl | N/A |
| File opened for reading | /proc/415/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/803/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/890/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1492/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/989/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1574/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1332/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/filesystems | /usr/bin/mount | N/A |
| File opened for reading | /proc/636/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1101/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1104/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1581/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/377/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/522/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/641/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1455/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/426/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/686/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1018/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1108/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/filesystems | /usr/bin/systemctl | N/A |
| File opened for reading | /proc/634/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/927/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1092/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1125/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1435/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1203/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1214/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/948/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/979/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1127/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/filesystems | /usr/bin/sed | N/A |
| File opened for reading | /proc/1249/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/586/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1442/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/1722/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/907/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/315/stat | /tmp/linux_amd64.elf | N/A |
| File opened for reading | /proc/594/stat | /tmp/linux_amd64.elf | N/A |
Processes
/tmp/linux_amd64.elf
[/tmp/linux_amd64.elf]
/tmp/linux_amd64.elf
[/tmp/linux_amd64.elf ]
/bin/sh
[/bin/sh -c /etc/32676&]
/etc/32676
[/etc/32676]
/usr/sbin/service
[service crond start]
/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*$/.socket/p]
/usr/bin/systemctl
[systemctl list-unit-files --full --type=socket]
/usr/local/sbin/systemctl
[systemctl start crond.service]
/usr/local/bin/systemctl
[systemctl start crond.service]
/usr/sbin/systemctl
[systemctl start crond.service]
/usr/bin/systemctl
[systemctl start crond.service]
/bin/sh
[/bin/sh -c cd /boot;systemctl daemon-reload;systemctl enable quotaoff.service;systemctl start quotaoff.service;journalctl -xe --no-pager]
/usr/bin/systemctl
[systemctl daemon-reload]
/usr/bin/systemctl
[systemctl enable quotaoff.service]
/usr/bin/systemctl
[systemctl start quotaoff.service]
/usr/bin/journalctl
[journalctl -xe --no-pager]
/bin/sh
[/bin/sh -c cd /boot;ausearch -c 'System.mod' --raw | audit2allow -M my-Systemmod;semodule -X 300 -i my-Systemmod.pp]
/bin/sh
[/bin/sh -c echo "*/1 * * * * root /.mod " >> /etc/crontab]
/usr/bin/renice
[renice -20 1574]
/usr/bin/mount
[mount -o bind /tmp/ /proc/1574]
/usr/sbin/service
[service cron start]
/usr/bin/basename
[basename /usr/sbin/service]
/usr/bin/basename
[basename /usr/sbin/service]
/usr/bin/sed
[sed -ne s/\.socket\s*[a-z]*\s*$/.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/systemctl
[systemctl start crond.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 |
Files
/etc/.walk
| MD5 | 8f30fc5c9bc57e29f60a3bbc55233340 |
| SHA1 | cd71c7c3d63ddb4ece0a11590a5c99b7139bcbbf |
| SHA256 | 87bb285fc080a6373ed6c0797993e459411392778563b1ca1ed9d8edb7bf3a35 |
| SHA512 | 73b3ecc8df6140d7b1fbaa8b73010484fe765161c3b46c7efad5606d60677431f5a7896b314e6db0517390bd7e957658d5ad44c4a68c5cd6696213bda41871fe |
/etc/.walk
| MD5 | 508d9067c51abc99613135a58cf4c9f2 |
| SHA1 | da531b9d4223e33e82274e56d065dc25a12de4fd |
| SHA256 | e65efc23357df0b10d2a985f42334b19626499bb6b5c0aa5e252359525cb1278 |
| SHA512 | 023fef9023a4f7387a5b528bdd873c3ec84a4fd85a2f6bd5a16af4324449d0a533e973e4036dc5d4f20f8e8635cd93cf525aa06a2187cc0eaedc18208526e5e2 |
/etc/32676
| MD5 | 585f408444cbca746945f0cb63f2c3f0 |
| SHA1 | 0e44bae17174f04514e770ca7fc4bec1007e39cd |
| SHA256 | ebb961c647363dfa90f302de378e0e61807b9b792fc86616635a713cca8f4299 |
| SHA512 | 022241dbafad55164701f67ef5b84154e3af97c5dfe77dee7bf8406f2befbd2962bbf4f243432b2f41d6c2376b87fcf551fd6945e03ddb02a5619c2f0f69c596 |
/boot/System.mod
| MD5 | 4a67fbaac9ab2555654663e56ad125a1 |
| SHA1 | d6dbe82c06c8bd5b83eea3daa26605b10c4e4457 |
| SHA256 | c09b6758cad544622f1a8a0e5edb64af4b952eb95ae94dcfe20fc1af2a9ab7e4 |
| SHA512 | 7a88709312bfdf50b3900abeab5e916fcbb63e773b58e158b557f239d1e8b861c4294dd86cfec80e4baf199fcb606d484da991c7b42594ec8999f945a4afb154 |
/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 | 227a551a2ad43e9a81c45248e53cb23f |
| SHA1 | a29d7440a50030bb93310486f52972b3ffac2eed |
| SHA256 | 590f1470687fe8cedf2b4a702258987fc4fdd82f71f570dadcf9728553f30018 |
| SHA512 | 9e5fd551602461d6b2626a3f9258934aca273ed13e53d51e72bcfc1a446bcc7bd44cfcbe6b670bef760c06dbdbfef6261046cd01ec1c9e669d1c7251b789ccff |