Analysis Overview
SHA256
d3030e1575b48293f9364353127bd44892ec65120c11d1710eead510373aab55
Threat Level: Known bad
The file linux_mipsel.elf was found to be: Known bad.
Malicious Activity Summary
Kaiji
Kaiji family
Executes dropped EXE
Creates/modifies Cron job
Changes its process name
Enumerates kernel/hardware configuration
Reads runtime system information
System Network Configuration Discovery
Command and Scripting Interpreter: Unix Shell
MITRE ATT&CK
Enterprise Matrix V16
Analysis: static1
Detonation Overview
Reported
2025-04-16 18:46
Signatures
Kaiji
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Kaiji family
Analysis: behavioral1
Detonation Overview
Submitted
2025-04-16 18:46
Reported
2025-04-16 18:49
Platform
debian9-mipsel-20250410-en
Max time kernel
149s
Max time network
150s
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 |
Creates/modifies Cron job
| Description | Indicator | Process | Target |
| File opened for modification | /etc/crontab | /bin/sh | 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_mipsel.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 |
Enumerates kernel/hardware configuration
| Description | Indicator | Process | Target |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/kernel/mm/transparent_hugepage/hpage_pmd_size | /tmp/linux_mipsel.elf | N/A |
| File opened for reading | /sys/kernel/mm/transparent_hugepage/hpage_pmd_size | /tmp/linux_mipsel.elf | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
| File opened for reading | /sys/fs/kdbus/0-system/bus | /bin/systemctl | N/A |
Reads runtime system information
| Description | Indicator | Process | Target |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/sed | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/cmdline | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/self/stat | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
| File opened for reading | /proc/1/environ | /bin/systemctl | N/A |
System Network Configuration Discovery
| Description | Indicator | Process | Target |
| N/A | N/A | /tmp/linux_mipsel.elf | N/A |
| N/A | N/A | /tmp/linux_mipsel.elf | N/A |
Processes
/tmp/linux_mipsel.elf
[/tmp/linux_mipsel.elf]
/tmp/linux_mipsel.elf
[/tmp/linux_mipsel.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]
/bin/sleep
[sleep 60]
/usr/bin/basename
[basename /usr/sbin/service]
/bin/systemctl
[systemctl --quiet is-active multi-user.target]
/bin/systemctl
[systemctl list-unit-files --full --type=socket]
/bin/sed
[sed -ne s/\.socket\s*[a-z]*\s*$/.socket/p]
/bin/systemctl
[systemctl -p Triggers show dbus.socket]
/bin/systemctl
[systemctl -p Triggers show ssh.socket]
/bin/systemctl
[systemctl -p Triggers show syslog.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-fsckd.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-initctl.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-journald-audit.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-journald-dev-log.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-journald.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-networkd.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-rfkill.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-udevd-control.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-udevd-kernel.socket]
/usr/local/sbin/systemctl
[systemctl start crond.service]
/usr/local/bin/systemctl
[systemctl start crond.service]
/usr/sbin/systemctl
[systemctl start crond.service]
/usr/bin/systemctl
[systemctl start crond.service]
/sbin/systemctl
[systemctl start crond.service]
/bin/systemctl
[systemctl start crond.service]
/bin/sh
[/bin/sh -c echo "*/1 * * * * root /.mod " >> /etc/crontab]
/usr/bin/renice
[renice -20 717]
/bin/mount
[mount -o bind /tmp/ /proc/717]
/usr/sbin/service
[service cron start]
/usr/bin/basename
[basename /usr/sbin/service]
/usr/bin/basename
[basename /usr/sbin/service]
/bin/systemctl
[systemctl --quiet is-active multi-user.target]
/bin/systemctl
[systemctl list-unit-files --full --type=socket]
/bin/sed
[sed -ne s/\.socket\s*[a-z]*\s*$/.socket/p]
/bin/systemctl
[systemctl -p Triggers show dbus.socket]
/bin/systemctl
[systemctl -p Triggers show ssh.socket]
/bin/systemctl
[systemctl -p Triggers show syslog.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-fsckd.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-initctl.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-journald-audit.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-journald-dev-log.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-journald.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-networkd.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-rfkill.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-udevd-control.socket]
/bin/systemctl
[systemctl -p Triggers show systemd-udevd-kernel.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]
/sbin/systemctl
[systemctl start cron.service]
/bin/systemctl
[systemctl start cron.service]
/bin/systemctl
[systemctl start crond.service]
/bin/sleep
[sleep 60]
/bin/sleep
[sleep 60]
Network
| Country | Destination | Domain | Proto |
| AU | 1.1.1.1:53 | www.google.com | udp |
| AU | 1.1.1.1:53 | www.google.com | udp |
| US | 154.40.47.248:888 | tcp |
Files
/etc/.walk
| MD5 | 9dda994087c2bc35d06b0eb91ae7aaf2 |
| SHA1 | ef819199d97a4c059d7554b5a4e9abd43a047236 |
| SHA256 | 54dd5f1b76931783b563f469f8376e8089be1e75a3e067e7697528e01cd4ec44 |
| SHA512 | 673051f1109c74e7c8982fbfe521ce12d676fba52f9cd6a3fd490056b1f978970b359061524ea13e32e9548f37afd54833fb3df53c372ea85be1161538184675 |
/etc/.walk
| MD5 | 4fcae83c2720754f59d2a4f2af72735e |
| SHA1 | a24d5cbb1d3b0e5c191ba64c61fad49c4baa5a7a |
| SHA256 | 5df5b1bb2147e17de64a4a96a10915458c2080c36d7dbe6a47d6857fb2a02220 |
| SHA512 | 62c335b961167260e203fe13fe45598aebdf33b4e25b85927c5fec8d57b92ce5dc883524aa4ec58bde5e5168488a903b2118c062561a497932e93b9da253c402 |
/etc/opt.services.cfg
| MD5 | 06a141032d508ea7639d82c044851727 |
| SHA1 | e49bf29f0c21f0e5a5d0ccee733ed1626df57d6b |
| SHA256 | d3030e1575b48293f9364353127bd44892ec65120c11d1710eead510373aab55 |
| SHA512 | 8173fc77c9ba84dc1a980c907dec6d2a37e20b3dec5438189fb1990e6c161de5a7ebc033091be2bcd7b80fb1bfe1478eb9f81f6811c9417fd95d3419c9cc2e05 |
/etc/32676
| MD5 | 585f408444cbca746945f0cb63f2c3f0 |
| SHA1 | 0e44bae17174f04514e770ca7fc4bec1007e39cd |
| SHA256 | ebb961c647363dfa90f302de378e0e61807b9b792fc86616635a713cca8f4299 |
| SHA512 | 022241dbafad55164701f67ef5b84154e3af97c5dfe77dee7bf8406f2befbd2962bbf4f243432b2f41d6c2376b87fcf551fd6945e03ddb02a5619c2f0f69c596 |
/.mod
| MD5 | f5a3713282e43c200f30342f5ff5e2ea |
| SHA1 | 2b2ce1a207e2b691a074c6f78f71c4785aae426a |
| SHA256 | 6ab64e727571458d4884fb2fe82c27c467db0699cb8f648b3f0217c35d2b7511 |
| SHA512 | 5bcb8cd360409147a486755f90e0cdd97183af02ce8de5135b7c6a8a010deb9ef12dcd5ee9a2a8fd2e159347f68e72d6b7fd75e943b4fcd928d7a74b97476013 |
/usr/bin/include/find
| MD5 | bb4edcad76062a76284c69f5fe4e50ea |
| SHA1 | 86055be4ce94fa3cffa9924e7b511e95df636606 |
| SHA256 | b7e25e128c130473f33c5135c78f591f35d7c4a7c5e1246c12eaa298db453474 |
| SHA512 | 254acc62d2f83f5a4686adcf3fe6ad4697f392c288c5baa323830bb6f2466c303fd7bc9f237e98b2ca76bc3abb6b4c264e042be8c4291ae5cc21b2189d996521 |
/etc/profile.d/gateway.sh
| MD5 | c8f763c31589dc4e50bf4b3ae51a3a18 |
| SHA1 | 6b4b735a4bd385c07eeebc2ca13d9bd29a175a74 |
| SHA256 | 9f8972f2b1980f7d2b4483ea08970e491880a9c6a301a5868ecefebd3e19af70 |
| SHA512 | 3bc66301adbac289bb7a4e022bd472fbba14906566d088325139224e7bc62396cfe6490094bc23364399807d7113914d8892efcdfd8d1f005e096994848b080a |