Analysis Overview
SHA256
1ac2ca656d2664e907d5349028c08a404bf98b3c97d3cfa1c7ef5187145142c1
Threat Level: Known bad
The file 259800bf6d1eb21a74ff1737f9826a0a.bin was found to be: Known bad.
Malicious Activity Summary
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
Enterprise Matrix V16
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
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
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/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf | N/A |
Modifies Watchdog functionality
| 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
| Description | Indicator | Process | Target |
| File opened for modification | /etc/crontab | /tmp/5aa6cc2b09d7fa0d3c5b6826f872826f5d3afb9af18c001ea3f4f1a1ccb188f7.elf | N/A |
Creates/modifies environment variables
| 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
Modifies systemd
| 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
Modifies Bash startup script
| 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
| 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
| 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 |