osquery-defense-kit/fs/unexpected-tmp-executables.sql

64 lines
1.8 KiB
SQL

-- Find unexpected executables in temp directories
SELECT file.path,
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 (
file.path LIKE "/tmp/%%"
OR file.path LIKE "/var/tmp/%%"
)
AND file.type = "regular"
AND (
file.mode LIKE "%7%"
or file.mode LIKE "%5%"
or file.mode LIKE "%1%"
)
AND NOT (
uid > 500
AND (
file.path LIKE "%go-build%"
OR file.path LIKE "%/bin/%-gen"
OR file.path LIKE "%/bin/%"
OR file.path LIKE "%/ko/%"
OR file.path LIKE "%/CCLBS/%"
OR file.path LIKE "%/tmp/epdf%"
OR file.path LIKE "%/pdf-tools/%"
OR file.path LIKE "/tmp/terraformer/%"
OR file.path LIKE "/tmp/checkout/%"
OR file.path LIKE "/tmp/go.%.sum"
OR file.path LIKE "/tmp/tmp.%"
OR file.path LIKE "/tmp/guile-%/guile-%"
OR file.path LIKE "/tmp/com.apple.installer%"
OR
-- These regular expressions can be narrowed down
(
file.size < 4000
AND file.path LIKE "/tmp/%.sh"
) OR (
file.size < 4000
AND file.path LIKE "/tmp/%.py"
)
)
)
-- Nix
AND NOT (
file.directory LIKE "/tmp/tmp%"
AND gid = 0
AND uid > 300
AND uid < 350
)
AND NOT magic.data LIKE "%nix-shell script%"
-- Don't alert if the file is only on disk for a moment
AND NOT (
file.directory LIKE "/tmp/%"
AND (strftime('%s', 'now') - ctime) < 60
)
-- macOS updates
AND NOT file.directory LIKE "/tmp/msu-target-%"