72 lines
2.2 KiB
SQL
72 lines
2.2 KiB
SQL
-- Applications setting environment variables to bypass security protections
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--
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-- Inpsired by BPFdoor and other intrusions
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-- https://www.sandflysecurity.com/blog/compromised-linux-cheat-sheet/
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--
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-- WARNING: This query is known to require a higher than average wall time.
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--
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-- tags: transient state
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-- interval: 300
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-- platform: linux
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SELECT
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pe.key,
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pe.value,
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LENGTH(pe.value) AS value_len,
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-- Child
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p0.pid AS p0_pid,
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p0.path AS p0_path,
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p0.name AS p0_name,
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p0.cmdline AS p0_cmd,
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p0.cwd AS p0_cwd,
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p0.cgroup_path AS p0_cgroup,
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p0.euid AS p0_euid,
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p0_hash.sha256 AS p0_sha256,
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-- Parent
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p0.parent AS p1_pid,
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p1.path AS p1_path,
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p1.name AS p1_name,
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p1.cmdline AS p1_cmd,
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p1_hash.sha256 AS p1_sha256,
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-- Grandparent
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p1.parent AS p2_pid,
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p2.name AS p2_name,
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p2.path AS p2_path,
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p2.cmdline AS p2_cmd,
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p2_hash.sha256 AS p2_sha256
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FROM
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-- Querying processes first and filtering by time gives a massive 20X speed improvement
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-- over querying process_envs first and JOIN'ing against processes
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processes p0
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JOIN process_envs pe ON p0.pid = pe.pid
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LEFT JOIN file f ON p0.path = f.path
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LEFT JOIN hash p0_hash ON p0.path = p0_hash.path
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LEFT JOIN processes p1 ON p0.parent = p1.pid
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LEFT JOIN hash p1_hash ON p1.path = p1_hash.path
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LEFT JOIN processes p2 ON p1.parent = p2.pid
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LEFT JOIN hash p2_hash ON p2.path = p2_hash.path
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WHERE -- This time should match the interval
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p0.start_time > (strftime('%s', 'now') - 300)
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AND (
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pe.key = 'HISTFILE'
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AND NOT pe.value LIKE '/home/%/.%_history'
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)
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OR (
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pe.key = 'LD_PRELOAD'
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AND NOT pe.value = ''
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AND NOT p0.path LIKE '%/firefox'
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AND NOT pe.value IN ('libfakeroot.so', '/usr/local/lib/libmimalloc.so')
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AND NOT pe.value LIKE ':/home/%/.local/share/Steam'
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AND NOT pe.value LIKE ':/home/%/.var/app/com.valvesoftware.Steam/%'
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AND NOT pe.value LIKE ':/home/%/.local/share/Steam/ubuntu%/gameoverlayrenderer.so:/home/%/.local/share/Steam/ubuntu%/gameoverlayrenderer.so'
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AND NOT pe.value LIKE ':/snap/%'
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AND NOT pe.value LIKE '/app/bin/%'
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AND NOT pe.value LIKE 'libmozsandbox.so%'
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)
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-- setuid
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OR (
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LENGTH(pe.value) > 1024
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AND pe.key != 'LS_COLORS'
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AND f.mode IS NOT NULL
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AND f.mode NOT LIKE '0%'
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)
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