osquery-defense-kit/detection/evasion/unexpected-var-executables-...

59 lines
1.4 KiB
SQL

-- Find unexpected executables in /var
--
-- false positives:
-- * none known
--
-- tags: persistent
-- platform: linux
SELECT
file.path,
file.directory,
uid,
gid,
mode,
file.mtime,
file.size,
hash.sha256,
magic.data
FROM
file
LEFT JOIN hash on file.path = hash.path
LEFT JOIN magic ON file.path = magic.path
WHERE
(
-- This list is the result of multiple queries combined and can likely be minimized
file.path LIKE '/var/%%'
OR file.path LIKE '/var/tmp/%%'
OR file.path LIKE '/var/tmp/.%/%%'
OR file.path LIKE '/var/tmp/%/%%'
OR file.path LIKE '/var/tmp/%/%/.%'
OR file.path LIKE '/var/tmp/%/.%/%%'
OR file.path LIKE '/var/spool/%%'
OR file.path LIKE '/var/spool/.%/%%'
OR file.path LIKE '/var/spool/%/%%'
OR file.path LIKE '/var/spool/%/%/.%'
OR file.path LIKE '/var/spool/%/.%/%%'
)
AND file.type = 'regular'
AND file.path NOT LIKE '%/../%'
AND file.path NOT LIKE '%/./%'
AND (
file.mode LIKE '%7%'
OR file.mode LIKE '%5%'
OR file.mode LIKE '%1%'
)
AND file.directory NOT IN (
'/var/lib/colord',
'/var/ossec/agentless',
'/var/ossec/bin',
'/var/ossec/wodles',
'/var/run/booted-system',
'/var/run/current-system'
)
AND file.path NOT IN (
'/var/run/lima-boot-done',
'/var/run/lima-ssh-ready'
)
AND magic.data NOT IN ('JSON data')
AND file.size > 10