Analysis Overview
SHA256
5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7
Threat Level: Known bad
The file linux_386.elf was found to be: Known bad.
Malicious Activity Summary
Kaiji family
Kaiji
Executes dropped EXE
Modifies Watchdog functionality
Enumerates running processes
Modifies init.d
Creates/modifies Cron job
Creates/modifies environment variables
Modifies systemd
Write file to user bin folder
Modifies Bash startup script
Changes its process name
Reads runtime system information
Enumerates kernel/hardware configuration
MITRE ATT&CK
Enterprise Matrix V16
Analysis: static1
Detonation Overview
Reported
2025-04-16 18:41
Signatures
Kaiji
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Kaiji family
Analysis: behavioral1
Detonation Overview
Submitted
2025-04-16 18:41
Reported
2025-04-16 18:44
Platform
ubuntu2204-amd64-20250410-en
Max time kernel
148s
Max time network
146s
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 | /tmp/linux_386.elf | N/A |
Modifies Watchdog functionality
| Description | Indicator | Process | Target |
| File opened for modification | /dev/misc/watchdog | /tmp/linux_386.elf | N/A |
| File opened for modification | /dev/watchdog | /tmp/linux_386.elf | N/A |
Creates/modifies Cron job
| Description | Indicator | Process | Target |
| File opened for modification | /etc/crontab | /tmp/linux_386.elf | N/A |
Creates/modifies environment variables
| Description | Indicator | Process | Target |
| File opened for modification | /etc/profile.d/bash_cfg | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/profile.d/bash_cfg.sh | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/profile.d/gateway.sh | /tmp/linux_386.elf | N/A |
Enumerates running processes
Modifies init.d
| Description | Indicator | Process | Target |
| File opened for modification | /etc/init.d/avahi-daemon | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/cups-browsed | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/kmod | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/x11-common | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/alsa-utils | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/cups | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/gdm3 | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/lvm2-lvmpolld | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/plymouth | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/procps | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/apparmor | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/cron | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/cryptdisks | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/hwclock.sh | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/keyboard-setup.sh | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/ssh | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/sssd | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/unattended-upgrades | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/console-setup.sh | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/rsync | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/apport | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/cryptdisks-early | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/dbus | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/openvpn | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/saned | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/spice-vdagent | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/anacron | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/bluetooth | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/iscsid | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/udev | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/acpid | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/open-iscsi | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/init.d/plymouth-log | /tmp/linux_386.elf | N/A |
Modifies systemd
| Description | Indicator | Process | Target |
| File opened for modification | /usr/lib/systemd/system/quotaoff.service | /tmp/linux_386.elf | N/A |
Write file to user bin folder
| Description | Indicator | Process | Target |
| File opened for modification | /usr/bin/include/ps | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/include/ls | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/include/find | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/include/lsof | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/ps | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/ss | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/ls | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/include/ss | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/include/dir | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/dir | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/find | /tmp/linux_386.elf | N/A |
| File opened for modification | /usr/bin/lsof | /tmp/linux_386.elf | N/A |
Modifies Bash startup script
| Description | Indicator | Process | Target |
| File opened for modification | /etc/profile.d/bash_cfg | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/profile.d/bash_cfg.sh | /tmp/linux_386.elf | N/A |
| File opened for modification | /etc/profile.d/gateway.sh | /tmp/linux_386.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_386.elf | N/A |
Enumerates kernel/hardware configuration
| Description | Indicator | Process | Target |
| File opened for reading | /sys/kernel/mm/transparent_hugepage/hpage_pmd_size | /tmp/linux_386.elf | N/A |
| File opened for reading | /sys/kernel/mm/transparent_hugepage/hpage_pmd_size | N/A | N/A |
Reads runtime system information
| Description | Indicator | Process | Target |
| File opened for reading | /proc/1243/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1356/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1567/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/filesystems | /usr/bin/systemctl | N/A |
| File opened for reading | /proc/732/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/736/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/783/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1032/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1105/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1181/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/896/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/927/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/988/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1012/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/589/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/926/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/979/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1110/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1196/stat | /tmp/linux_386.elf | 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/890/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/989/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1085/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1103/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1312/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1115/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/418/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/594/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/907/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1119/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1344/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1520/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/427/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/559/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/649/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/997/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1125/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1324/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1449/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1574/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/314/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/799/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/973/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1025/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1111/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1580/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/407/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/552/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/590/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/668/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1104/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1109/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1436/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/filesystems | /usr/bin/journalctl | N/A |
| File opened for reading | /proc/741/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/769/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/315/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/filesystems | /usr/bin/sed | N/A |
| File opened for reading | /proc/699/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/760/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/948/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/1551/stat | /tmp/linux_386.elf | N/A |
| File opened for reading | /proc/775/stat | /tmp/linux_386.elf | N/A |
Processes
/tmp/linux_386.elf
[/tmp/linux_386.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 |
Files
/etc/.walk
| MD5 | be61c2bc8a19feeea95e41d0e94962fd |
| SHA1 | b6c8e9a0a0cbf3e798f1e6669508bc7e9ad43173 |
| SHA256 | edb1c48d5c2a89d9e1a570967cf2dff861485814636c1c4a26bf4ee6dbe402e1 |
| SHA512 | e229c10ac49bf73a846ed9a58fa4fdb6e49a8cc07209094b92a2bf9bc6b72954c68c129800e4c356a7c7b383a8a5fe70d0401eafa8cb1382142778303179c6ac |
/etc/.walk
| MD5 | 7fb437af67907135c8eb965295be8ea2 |
| SHA1 | 325692899cabcbb1fbf3ecb751f53ca78db88436 |
| SHA256 | 69b3cbc38cafc06e2a36e10cec346941953745563e2239d6284bd38bb0b1b5e7 |
| SHA512 | c7eb8050562741c375a13b1076dc6e2cbb3533541f33222b09db0a9bd8cd02b8a1932566d53e5b2822d6b21feb2cf94ba0695b7bd9d6902874b1acfacf3ff2a8 |
/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 | f2b1f3db600ea068846bf5937f3f0ea4 |
| SHA1 | ec98496f6cfbd295a9679a912f3d75a72e1183fe |
| SHA256 | bd6a2dbd29257d09768bc45cbbd3a75fbafe26f49f8d1487ac35644cb7a53e47 |
| SHA512 | 7cc944508882ea9bf98c7f6e7d86394410fc273643430422d267595d498a919999e5ca939d90f4fdc81a69201b83cd1a687a7ffa9f4f671799fb5a0a6ea294be |