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osquery-defense-kit/detection/c2/unexpected-talkers-linux.sql

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-- Unexpected programs communicating over non-HTTPS protocols (state-based)
--
-- This query is a bit awkward and hobbled due to the lack of osquery support
-- for looking up binary signatures in Linux.
--
-- references:
-- * https://attack.mitre.org/techniques/T1071/ (C&C, Application Layer Protocol)
--
-- tags: transient state net rapid
-- platform: linux
SELECT
s.remote_address,
s.remote_port,
s.local_port,
s.local_address,
p.name,
p.path,
p.cmdline AS child_cmd,
p.cwd,
pp.path AS parent_path,
p.parent AS parent_pid,
pp.cmdline AS parent_cmd,
p.cgroup_path,
s.state,
hash.sha256,
-- This intentionally avoids file.path, as it won't join across mount namespaces
CONCAT (
MIN(s.remote_port, 32768),
',',
s.protocol,
',',
MIN(p.euid, 500),
',',
REGEX_MATCH (p.path, '.*/(.*?)$', 1),
',',
MIN(f.uid, 500),
'u,',
MIN(f.gid, 500),
'g,',
p.name
) AS exception_key
FROM
process_open_sockets s
LEFT JOIN processes p ON s.pid = p.pid
LEFT JOIN processes pp ON p.parent = pp.pid
LEFT JOIN file f ON p.path = f.path
LEFT JOIN hash ON p.path = hash.path
WHERE
protocol > 0
AND s.remote_port > 0 -- See unexpected-https-client
AND NOT (
s.remote_port = 443
AND protocol IN (6, 17)
) -- See unexpected-dns-traffic
AND NOT (
s.remote_port = 53
AND protocol IN (6, 17)
)
AND s.remote_address NOT IN (
'127.0.0.1',
'::ffff:127.0.0.1',
'::1',
'::',
'0.0.0.0'
)
AND s.remote_address NOT LIKE 'fe80:%'
AND s.remote_address NOT LIKE '127.%'
AND s.remote_address NOT LIKE '192.168.%'
AND s.remote_address NOT LIKE '100.7%'
AND s.remote_address NOT LIKE '169.254.%'
AND s.remote_address NOT LIKE '172.1%'
AND s.remote_address NOT LIKE '172.2%'
AND s.remote_address NOT LIKE '172.30.%'
AND s.remote_address NOT LIKE '172.31.%'
AND s.remote_address NOT LIKE '::ffff:172.%'
AND s.remote_address NOT LIKE '10.%'
AND s.remote_address NOT LIKE '::ffff:10.%'
AND s.remote_address NOT LIKE '::ffff:192.168.%'
AND s.remote_address NOT LIKE 'fc00:%'
AND p.path != ''
AND NOT (
s.remote_address LIKE '100.%'
AND s.local_address LIKE '100.%'
AND exception_key = '32768,6,%,sshd,0u,0g,sshd'
)
AND NOT exception_key IN (
'123,17,500,chronyd,0u,0g,chronyd',
'4070,6,500,spotify,u,g,spotify',
'49152,6,500,ContinuityCaptureAgent,Software Signing',
'67,17,0,NetworkManager,0u,0g,NetworkManager',
'8000,6,500,brave,0u,0g,brave',
'587,6,500,perl,0u,0g,git-send-email',
'8000,6,500,chrome,0u,0g,chrome',
'8000,6,500,firefox,0u,0g,firefox',
'80,6,0,grep,0u,0g,grep',
'80,6,0,incusd,0u,0g,incusd',
'80,6,0,kmod,0u,0g,depmod',
'80,6,0,kubelet,u,g,kubelet',
'80,6,0,ldconfig,0u,0g,ldconfig',
'80,6,0,NetworkManager,0u,0g,NetworkManager',
'80,6,0,packagekitd,0u,0g,packagekitd',
'80,6,0,pacman,0u,0g,pacman',
'80,6,0,pdftex,0u,0g,pdftex',
'80,6,0,python3.10,0u,0g,dnf',
'80,6,0,python3.10,0u,0g,dnf-automatic',
'80,6,0,python3.10,0u,0g,yum',
'80,6,0,python3.11,0u,0g,dnf',
'80,6,500,http,0u,0g,http',
'80,6,0,python3.11,0u,0g,dnf-automatic',
'80,6,0,python3.11,0u,0g,yum',
'80,6,0,python3.12,0u,0g,dnf',
'80,6,0,python3.12,0u,0g,yum',
'80,6,0,python3.9,u,g,yum',
'80,6,0,rpm-ostree,0u,0g,rpm-ostree',
'80,6,0,sort,0u,0g,sort',
'80,6,0,systemd-hwdb,0u,0g,systemd-hwdb',
'80,6,0,tailscaled,0u,0g,tailscaled',
'80,6,0,wget,0u,0g,wget',
'80,6,0,zstd,0u,0g,zstd',
'80,6,100,http,0u,0g,http',
'80,6,105,http,0u,0g,http',
'80,6,42,http,0u,0g,http',
'80,6,500,aws-iam-authenticator,0u,0g,aws-iam-authent',
'80,6,500,brave,0u,0g,brave',
'80,6,500,chrome,0u,0g,chrome',
'80,6,500,chrome,u,g,chrome',
'80,6,500,cloud_sql_proxy,0u,0g,cloud_sql_proxy',
'80,6,500,code,0u,0g,code',
'80,6,500,code-oss,u,g,code-oss',
'80,6,500,copilot-agent-linux,500u,500g,copilot-agent-l',
'80,6,500,curl,0u,0g,curl',
'80,6,500,electron,0u,0g,electron',
'80,6,500,firefox,0u,0g,firefox',
'80,6,500,firefox,0u,0g,.firefox-wrappe',
'80,6,500,firefox-bin,0u,0g,firefox-bin',
'80,6,500,firefox-bin,500u,500g,firefox-bin',
'80,6,500,firefox-bin,u,g,firefox-bin',
'80,6,500,flatpak,0u,0g,flatpak',
'80,6,500,git-remote-http,0u,0g,git-remote-http',
'80,6,500,gnome-software,0u,0g,gnome-software',
'80,6,500,http,u,g,http',
'80,6,500,java,0u,0g,java',
'80,6,500,java,u,g,java',
'80,6,500,main,500u,500g,main',
'80,6,500,mconvert,500u,500g,mconvert',
'80,6,500,mediawriter,u,g,mediawriter',
'80,6,500,melange,500u,500g,melange',
'80,6,500,obs-browser-page,u,g,obs-browser-pag',
'80,6,500,pacman,0u,0g,pacman',
'80,6,500,python3.10,0u,0g,aws',
'80,6,500,python3.10,0u,0g,yum',
'80,6,500,python3.11,0u,0g,abrt-action-ins',
'80,6,500,python3.11,0u,0g,dnf',
'80,6,500,python3.11,0u,0g,yum',
'80,6,500,python3.12,0u,0g,pull-lp-source',
'80,6,500,qemu-system-x86_64,0u,0g,qemu-system-x86',
'80,6,500,qemu-system-x86_64,500u,500g,qemu-system-x86',
'80,6,500,rpi-imager,0u,0g,rpi-imager',
'80,6,500,signal-desktop,0u,0g,signal-desktop',
'80,6,500,signal-desktop,u,g,signal-desktop',
'80,6,500,slack,0u,0g,slack',
'80,6,500,slirp4netns,500u,500g,slirp4netns',
'80,6,500,spotify,0u,0g,spotify',
'80,6,500,spotify,500u,500g,spotify',
'80,6,500,spotify-launcher,0u,0g,spotify-launche',
'80,6,500,spotify,u,g,spotify',
'80,6,500,steam,500u,100g,steam',
'80,6,500,steam,500u,500g,steam',
'80,6,500,steamwebhelper,500u,500g,steamwebhelper',
'80,6,500,terraform,0u,0g,terraform',
'80,6,500,terraform,500u,500g,terraform',
'80,6,500,thunderbird,0u,0g,thunderbird',
'80,6,500,thunderbird-bin,u,g,thunderbird-bin',
'80,6,500,thunderbird,u,g,thunderbird',
'80,6,500,WebKitNetworkProcess,0u,0g,WebKitNetworkPr',
'80,6,500,wget,0u,0g,wget',
'80,6,500,wine64-preloader,0u,0g,control.exe',
'80,6,500,zoom,0u,0g,zoom',
'80,6,500,zoom.real,u,g,zoom.real',
'8080,6,500,brave,0u,0g,brave',
'8080,6,500,chrome,0u,0g,chrome',
'8080,6,500,firefox,0u,0g,firefox',
'8080,6,500,python3.11,0u,0g,speedtest-cli',
'8080,6,500,speedtest,500u,500g,speedtest',
'8443,6,500,chrome,0u,0g,chrome',
'8443,6,500,firefox,0u,0g,firefox',
'8801,17,500,zoom,0u,0g,zoom',
'8801,17,500,zoom.real,u,g,zoom.real',
'88,6,500,syncthing,0u,0g,syncthing',
'8987,6,500,whois,0u,0g,whois',
'9,17,0,launcher,0u,0g,launcher',
'9418,6,500,git,0u,0g,git',
'993,6,500,evolution,0u,0g,evolution',
'993,6,500,thunderbird,0u,0g,thunderbird',
'993,6,500,thunderbird,u,g,thunderbird',
'9999,6,500,firefox,0u,0g,firefox'
)
AND NOT exception_key LIKE '80,6,500,terraform_1.1.5,500u,500g,terraform'
AND NOT exception_key LIKE '%,6,500,nuclei,500u,500g,nuclei'
AND NOT exception_key LIKE '%,6,500,ssh,0u,0g,ssh'
AND NOT (
p.name = 'java'
AND p.cmdline LIKE '/home/%/.local/share/JetBrains/Toolbox/%'
AND s.remote_port > 1024
AND s.protocol = 6
AND p.euid > 500
)
AND NOT (
p.name = 'ruby'
AND p.cmdline LIKE '%fluentd%'
AND s.remote_port > 1024
AND s.protocol = 6
AND p.euid > 500
)
AND NOT (
p.name IN ('java', 'jcef_helper')
AND p.cmdline LIKE '/home/%/PhpStorm%'
AND s.remote_port > 79
AND s.protocol = 6
AND p.euid > 500
)
AND NOT (
p.name = 'syncthing'
AND f.filename = 'syncthing'
AND s.remote_port > 900
AND s.protocol = 6
AND p.euid > 500
)
AND NOT (
p.name = 'chrome'
AND f.filename = 'chrome'
AND s.remote_port > 1024
AND s.protocol IN (6, 17)
AND p.euid > 500
)
AND NOT (
p.name = 'steam'
AND f.filename = 'steam'
AND s.remote_port > 27000
AND s.protocol IN (6, 17)
AND p.euid > 500
)
AND NOT (
p.name = 'brave'
AND f.filename = 'brave'
AND s.remote_port > 3000
AND s.protocol IN (6, 17)
AND p.euid > 500
)
AND NOT (
p.name IN ('firefox', 'firefox-bin')
AND f.filename IN ('firefox', 'firefox-bin')
AND s.remote_port > 3000
AND s.protocol IN (6, 17)
AND p.euid > 500
) -- TODO: Move this to a custom override overlay, as it is extremely obscure (small ISP)
AND NOT (
exception_key = '32768,6,500,ssh,0u,0g,ssh'
AND s.remote_port = 40022
) -- Qualys
AND NOT (
exception_key = '80,6,0,curl,0u,0g,curl'
AND p.cgroup_path = '/system.slice/qualys-cloud-agent.service'
AND child_cmd LIKE ' curl -sS -H Metadata:true http://169.254.169.254/metadata/instance%'
)
AND NOT (
s.remote_port = 80
AND (
p.cgroup_path LIKE '/system.slice/docker-%'
OR p.cgroup_path LIKE '/user.slice/user-%.slice/user@%.service/user.slice/nerdctl-%'
)
)
GROUP BY
p.cmdline
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