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-- Unexpected programs communicating over HTTPS (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 often
-- platform: linux
SELECT
s.remote_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,
s.state,
hash.sha256,
-- This intentionally avoids file.path, as it won't join across mount namespaces
CONCAT (
MIN(p.euid, 500),
',',
REPLACE(
REPLACE(
REGEX_MATCH (p.path, '(/.*?)/', 1),
'/nix',
'/usr'
),
'/snap',
'/opt'
),
'/',
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 IN (6, 17)
AND s.remote_port = 443
AND s.remote_address NOT IN ('127.0.0.1', '::ffff:127.0.0.1', '::1')
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 '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 'fc00:%'
AND p.path != ''
AND NOT exception_key IN (
'0,/opt/snapd,0u,0g,snapd',
'0,/sbin/apk,u,g,apk',
'0,/usr/bash,0u,0g,mkinitcpio',
'0,/usr/cmake,u,g,cmake',
'0,/usr/containerd,u,g,containerd',
'0,/usr/dockerd,0u,0g,dockerd',
'0,/usr/flatpak-system-helper,0u,0g,flatpak-system-',
'0,/usr/launcher,0u,0g,launcher',
'0,/usr/nix,0u,0g,nix',
'0,/usr/packagekitd,0u,0g,packagekitd',
'0,/usr/pacman,0u,0g,pacman',
'0,/usr/python3.10,0u,0g,dnf',
'0,/usr/python3.10,0u,0g,yum',
'0,/usr/rpi-imager,0u,0g,rpi-imager',
'0,/usr/snapd,0u,0g,snapd',
'0,/usr/tailscaled,0u,0g,tailscaled',
'0,/usr/.tailscaled-wrapped,0u,0g,.tailscaled-wra',
'105,/usr/http,0u,0g,https',
'500,/app/slack,u,g,slack',
'500,/app/thunderbird,u,g,thunderbird',
'500,/app/zoom.real,u,g,zoom.real',
'500,/home/chainctl,500u,100g,chainctl',
'500,/home/chainctl,500u,500g,chainctl',
'500,/home/code,500u,500g,code',
'500,/home/cosign,500u,500g,cosign',
'500,/home/gitsign,500u,500g,gitsign',
'500,/home/go,500u,500g,go',
'500,/home/grype,500u,500g,grype',
'500,/home/java,500u,500g,java',
'500,/home/jcef_helper,500u,500g,jcef_helper',
'500,/home/ko,500u,500g,ko',
'500,/home/steam,500u,100g,steam',
'500,/home/steamwebhelper,500u,100g,steamwebhelper',
'500,/home/WPILibInstaller,500u,500g,WPILibInstaller',
'500,/ko-app/chainctl,u,g,chainctl',
'500,/ko-app/controlplane,u,g,controlplane',
'500,/opt/1password,0u,0g,1password',
'500,/opt/Brackets,0u,0g,Brackets',
'500,/opt/chrome,0u,0g,chrome',
'500,/opt/Discord,0u,0g,Discord',
'500,/opt/firefox,0u,0g,firefox',
'500,/opt/firefox,0u,0g,Socket Process',
'500,/opt/kubectl,0u,0g,kubectl',
'500,/opt/slack,0u,0g,slack',
'500,/opt/snap-store,0u,0g,snap-store',
'500,/opt/spotify,0u,0g,spotify',
'500,/opt/todoist,0u,0g,todoist',
'500,/opt/zoom,0u,0g,zoom',
'500,/tmp/jetbrains-toolbox,u,g,jetbrains-toolb',
'500,/usr/abrt-action-generate-core-backtrace,0u,0g,abrt-action-gen',
'500,/usr/bom,500u,500g,bom',
'500,/usr/cargo,0u,0g,cargo',
'500,/usr/chainctl,0u,0g,chainctl',
'500,/usr/chrome,0u,0g,chrome',
'500,/usr/code,0u,0g,code',
'500,/usr/cosign,500u,500g,cosign',
'500,/usr/curl,0u,0g,curl',
'500,/usr/electron,0u,0g,electron',
'500,/usr/evolution-calendar-factory,0u,0g,evolution-calen',
'500,/usr/firefox,0u,0g,firefox',
'500,/usr/firefox,0u,0g,.firefox-wrappe',
'500,/usr/firefox,0u,0g,Socket Process',
'500,/usr/flameshot,0u,0g,flameshot',
'500,/usr/flatpak-oci-authenticator,0u,0g,flatpak-oci-aut',
'500,/usr/geoclue,0u,0g,geoclue',
'500,/usr/git-remote-http,0u,0g,git-remote-http',
'500,/usr/gitsign,0u,0g,gitsign',
'500,/usr/gnome-recipes,0u,0g,gnome-recipes',
'500,/usr/gnome-shell,0u,0g,gnome-shell',
'500,/usr/gnome-software,0u,0g,gnome-software',
'500,/usr/go,0u,0g,go',
'500,/usr/nautilus,0u,0g,nautilus',
'500,/usr/go,500u,500g,go',
'500,/usr/gsd-datetime,0u,0g,gsd-datetime',
'500,/usr/gvfsd-http,0u,0g,gvfsd-http',
'500,/usr/java,0u,0g,java',
'500,/usr/java,u,g,java',
'500,/usr/kubectl,500u,500g,kubectl',
'500,/usr/lens,0u,0g,lens',
'500,/usr/obs,0u,0g,obs',
'500,/usr/reporter-ureport,0u,0g,reporter-urepor',
'500,/usr/rpi-imager,0u,0g,rpi-imager',
'500,/usr/signal-desktop,0u,0g,signal-desktop',
'500,/usr/slack,0u,0g,slack',
'500,/usr/spotify,0u,0g,spotify',
'500,/usr/syncthing,0u,0g,syncthing',
'500,/usr/terraform,0u,0g,terraform',
'500,/usr/trivy,0u,0g,trivy',
'500,/usr/WebKitNetworkProcess,0u,0g,WebKitNetworkPr',
'500,/usr/xmobar,0u,0g,xmobar',
'500,/usr/yay,0u,0g,yay'
)
-- Exceptions where we have to be more flexible for the process name
AND NOT exception_key LIKE '500,/usr/node,0u,0g,npm exec %'
AND NOT exception_key LIKE '500,%/terraform-provider-aws_%,500u,500g,terraform-provi'
-- stay weird, NixOS (Fastly nix mirror)
AND NOT (
pp.cmdline = '/run/current-system/sw/bin/bash'
AND p.path LIKE '/nix/store/%'
AND s.remote_address LIKE '151.101.%'
AND s.state = 'ESTABLISHED'
)
AND NOT (
exception_key = '500,/tmp/main,500u,500g,main'
AND p.path LIKE '/tmp/go-build%/exe/main'
)
GROUP BY
p.cmdline
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