Parent Pid Missing From Procfs
osquery
Find a process which has a parent that is not listed in the process table
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 a process which has a parent that is not listed in the process table
--
-- Works well for revealing boopkit, so long as boopkit has a child process.
--
-- references:
-- * https://github.com/krisnova/boopkit
-- * https://attack.mitre.org/techniques/T1014/ (Rootkit)
--
-- false positives:
-- * Can by racy if child and parent exit at the right time
--
-- tags: persistent daemon
SELECT
p.*,
hash.sha256,
GROUP_CONCAT(DISTINCT pof.path) AS open_files
FROM
processes p
LEFT JOIN hash ON p.path = hash.path
LEFT JOIN process_open_files pof ON p.pid = pof.pid
WHERE -- Prevent false positives by avoiding short-lived commands
p.start_time < (strftime('%s', 'now') -300)
AND p.parent NOT IN (
SELECT
pid
FROM
processes
)
AND p.parent != 0
AND p.parent IS NOT NULL
GROUP BY
p.pidtags: SStagSS