Exotic Command Events Linux
osquery
Pick out exotic processes based on their command-line (events-based)
Description
ODK (osquery-defense-kit) is unique in that the queries are designed to be used as part of a production detection & response pipeline. The detection queries are formulated to return zero rows during normal expected behavior, so that they may be configured to generate alerts when rows are returned.
Query
-- Pick out exotic processes based on their command-line (events-based)
--
-- references:
-- * https://themittenmac.com/what-does-apt-activity-look-like-on-macos/
--
-- false positives:
-- * possible, but none known
--
-- tags: transient process events extra
-- platform: linux
-- interval: 600
SELECT -- Child
pe.path AS p0_path,
pe.time AS p0_time,
pe.uptime AS p0_uptime,
REGEX_MATCH (pe.path, '.*/(.*)', 1) AS p0_name,
TRIM(pe.cmdline) AS p0_cmd,
pe.cwd AS p0_cwd,
pe.pid AS p0_pid,
p.cgroup_path AS p0_cgroup,
-- Parent
pe.parent AS p1_pid,
p1.cgroup_path AS p1_cgroup,
TRIM(COALESCE(p1.cmdline, pe1.cmdline)) AS p1_cmd,
COALESCE(p1.path, pe1.path) AS p1_path,
COALESCE(p_hash1.sha256, pe_hash1.sha256) AS p1_hash,
REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) AS p1_name,
-- Grandparent
COALESCE(p1.parent, pe1.parent) AS p2_pid,
COALESCE(p1_p2.cgroup_path, pe1_p2.cgroup_path) AS p2_cgroup,
TRIM(
COALESCE(p1_p2.cmdline, pe1_p2.cmdline, pe1_pe2.cmdline)
) AS p2_cmd,
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path) AS p2_path,
REGEX_MATCH (
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
'.*/(.*)',
1
) AS p2_name,
-- Exception key
REGEX_MATCH (pe.path, '.*/(.*)', 1) || ',' || MIN(pe.euid, 500) || ',' || REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) || ',' || REGEX_MATCH (
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
'.*/(.*)',
1
) AS exception_key
FROM
process_events pe
LEFT JOIN processes p ON pe.pid = p.pid -- Parents (via two paths)
LEFT JOIN processes p1 ON pe.parent = p1.pid
AND p1.start_time <= pe.time
LEFT JOIN hash p_hash1 ON p1.path = p_hash1.path
LEFT JOIN process_events pe1 ON pe.parent = pe1.pid
AND pe1.time <= pe.time
AND pe1.cmdline != ""
AND pe1.cwd != ""
LEFT JOIN hash pe_hash1 ON pe1.path = pe_hash1.path -- Grandparents (via 3 paths)
LEFT JOIN processes p1_p2 ON p1.parent = p1_p2.pid -- Current grandparent via parent processes
AND p1_p2.start_time <= p1.start_time
LEFT JOIN processes pe1_p2 ON pe1.parent = pe1_p2.pid -- Current grandparent via parent events
AND pe1_p2.start_time <= pe1.time
LEFT JOIN process_events pe1_pe2 ON pe1.parent = pe1_p2.pid
AND pe1_pe2.cmdline != ""
AND pe1_pe2.cwd != ""
WHERE
pe.time > (strftime('%s', 'now') -600)
AND pe.cmdline != ""
AND pe.cwd != ""
AND (
p0_name IN (
'bitspin',
'bpftool',
'cpuminer-multi',
'cpuminer',
'dnscat2',
'esxcli',
'heyoka',
'httpdns',
'incbit',
'insmod',
'iodine',
'kmod',
'lushput',
'minerd',
'mkfifo',
'msfvenom',
'nc',
'nstx',
'rsh',
'rshell',
'socat',
'tuns',
'vim-cmd',
'xmrig'
) -- Chrome Stealer
OR p0_name LIKE '%attack%' -- Unusual behaviors
OR p0_name LIKE '%pwn%'
OR p0_cmd LIKE '%cat /dev/null >%'
OR p0_cmd LIKE '%chattr -i%'
OR p0_cmd LIKE '%chrome%-load-extension%' -- Known attack scripts
OR p0_cmd LIKE '%dd if=/dev/%'
OR p0_cmd LIKE '%iptables -F%'
OR p0_cmd LIKE '%iptables -P % ACCEPT%'
OR p0_cmd LIKE '%iptables stop'
OR p0_cmd LIKE '%setenforce 0'
OR p0_cmd LIKE '%truncate -s0 %'
OR p0_cmd LIKE '%ufw disable%'
OR (
INSTR(p0_cmd, 'history') > 0
AND p0_cmd LIKE '%history'
AND p0_cmd NOT LIKE 'man %'
)
OR p0_cmd LIKE '%.aws/%'
OR p0_cmd LIKE '%.config/%chrome%'
OR p0_cmd LIKE '%.config%gcloud%'
OR p0_cmd LIKE '%ld.so.preload%'
OR p0_cmd LIKE '%nohup%tmp%'
OR p0_cmd LIKE '%pkill -f%'
OR p0_cmd LIKE '%systemctl disable firewalld%'
OR p0_cmd LIKE '%systemctl stop firewalld%'
OR p0_cmd LIKE '%tar % .%'
OR p0_cmd LIKE '%tar %/.%'
OR p0_cmd LIKE '%touch -r%'
OR p0_cmd LIKE '%touch%acmr%'
OR p0_cmd LIKE '%urllib.urlopen%'
OR (
p0_cmd LIKE '%xargs kill -9%'
AND pe.euid = 0
)
OR p0_cmd LIKE '%@reboot%crontab%'
OR p0_cmd LIKE '%/dev/%cp/%'
OR p0_cmd LIKE '%echo%|%base64%-d% %|%'
OR p0_cmd LIKE '%fsockopen%'
OR p0_cmd LIKE '%monero%'
OR p0_cmd LIKE '%nanopool%'
OR p0_cmd LIKE '%nicehash%'
OR p0_cmd LIKE '%nohup /bin/bash%'
OR p0_cmd LIKE '%openssl%quiet%'
OR p0_cmd LIKE '%pty.spawn%'
OR p0_cmd LIKE '%stratum%'
OR p0_cmd LIKE '%UserKnownHostsFile=/dev/null%' -- Crypto miners
OR (
p0_cmd LIKE '%sh -i'
AND NOT p1_name IN ('sh', 'java')
)
OR p0_cmd LIKE '%SOCK_STREAM%'
OR INSTR(p0_cmd, 'Socket.') > 0
OR (
p0_cmd LIKE '%tail -f /dev/null%'
AND p.cgroup_path NOT LIKE '/system.slice/docker-%'
)
) -- Things that could reasonably happen at boot.
AND NOT (
pe.path IN ('/usr/bin/kmod', '/bin/kmod')
AND p1_path = '/usr/lib/systemd/systemd'
AND p1_cmd = '/sbin/init'
)
AND NOT (
pe.path IN ('/usr/bin/kmod', '/bin/kmod')
AND p1_name IN (
'dockerd',
'firewalld',
'kube-proxy',
'mkinitramfs',
'systemd'
)
)
AND NOT (
p0_cmd LIKE '/usr/bin/modprobe %'
AND p1_cgroup = '/system.slice/firewalld.service'
)
AND NOT (
pe.path IN ('/usr/bin/kmod', '/bin/kmod')
AND pe.uptime < 15
)
AND NOT (
pe.path = '/usr/bin/mkfifo'
AND (
p0_cmd LIKE '%/org.gpgtools.log.%/fifo'
OR p0_cmd LIKE 'mkfifo -- %/gitstatus.POWERLEVEL9K%.fifo'
OR p0_cmd LIKE '%/p10k.%'
)
)
AND NOT p0_cmd IN (
'lsmod',
'dd if=/dev/stdin conv=unblock cbs=79',
'/usr/bin/socat STDIN UNIX-CONNECT:/run/user/1000/kwallet5.socket',
'socat STDIN UNIX-CONNECT:/run/user/1000/kwallet5.socket'
)
AND NOT p0_cmd LIKE '%/usr/bin/cmake%Socket%'
AND NOT p0_cmd LIKE '%modprobe -va%'
AND NOT p0_cmd LIKE '%modprobe aufs'
AND NOT p0_cmd LIKE '%modprobe nf_nat_netbios_ns'
AND NOT p0_cmd LIKE '%modprobe overlay'
AND NOT p0_cmd LIKE '%touch -r /tmp/cc%.o %'
AND NOT p0_cmd LIKE 'find . -executable -type f -name %grep -l GNU Libtool%touch -r%'
AND NOT p0_cmd LIKE 'modinfo -k%'
AND NOT p0_cmd LIKE 'modprobe --all%'
AND NOT p0_cmd LIKE 'modprobe -ab%'
AND NOT p0_cmd LIKE 'pkill -f cut -c3%'
AND NOT p0_name IN (
'ar',
'cc1',
'cc1plus',
'cmake',
'compile'
)
AND NOT exception_key IN (
'bash,0,bash,containerd-shim-runc-v2',
'bash,500,ninja,bash',
'bwrap,500,melange,dash',
'chrome_crashpad_handler,500,systemd,systemd',
'grep,500,fish,konsole',
'kmod,0,incusd,systemd',
'ls,500,zsh,alacritty',
'nc,500,fish,konsole',
'tar,0,incusd,systemd'
)tags: SStagSS