Low Fd Socket
osquery
Find programs where fd0 (stdin), fd1 (stdout), or fd2 (stderr) are connected to a socket
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
-- Find programs where fd0 (stdin), fd1 (stdout), or fd2 (stderr) are connected to a socket
--
-- false positives:
-- * none known
--
-- references:
-- * https://www.deepinstinct.com/blog/bpfdoor-malware-evolves-stealthy-sniffing-backdoor-ups-its-game
--
-- tags: process state
-- platform: posix
SELECT
pos.protocol,
pos.pid,
pos.remote_address,
pos.local_address,
pos.local_port,
pos.remote_port,
pos.state,
-- Child
p0.pid AS p0_pid,
p0.path AS p0_path,
p0.name AS p0_name,
p0.start_time AS p0_start,
p0.cmdline AS p0_cmd,
p0.cwd AS p0_cwd,
p0.cgroup_path AS p0_cgroup,
p0.euid AS p0_euid,
p0_hash.sha256 AS p0_sha256,
-- Parent
p0.parent AS p1_pid,
p1.path AS p1_path,
p1.name AS p1_name,
p1.start_time AS p1_start,
p1.euid AS p1_euid,
p1.cmdline AS p1_cmd,
p1_hash.sha256 AS p1_sha256,
-- Grandparent
p1.parent AS p2_pid,
p2.name AS p2_name,
p2.start_time AS p2_start,
p2.path AS p2_path,
p2.cmdline AS p2_cmd,
p2_hash.sha256 AS p2_sha256
FROM
process_open_sockets pos
JOIN processes p0 ON pos.pid = p0.pid
LEFT JOIN hash p0_hash ON p0.path = p0_hash.path
LEFT JOIN processes p1 ON p0.parent = p1.pid
LEFT JOIN hash p1_hash ON p1.path = p1_hash.path
LEFT JOIN processes p2 ON p1.parent = p2.pid
LEFT JOIN hash p2_hash ON p2.path = p2_hash.path
WHERE
pos.fd < 3
AND pos.family != 1
AND p0.path NOT IN (
'/Applications/NetSpot.app/Contents/MacOS/NetSpot',
'/Library/Application Support/Viscosity/viscosity_openvpn',
'/usr/bin/skopeo',
'/usr/libexec/bootpd',
'/usr/libexec/pcp/bin/pmcd',
'/usr/local/bin/velociraptor'
)tags: SStagSS