82 lines
2.1 KiB
SQL
82 lines
2.1 KiB
SQL
-- Find unexpected executables in /dev
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--
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-- references:
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-- * https://www.sandflysecurity.com/blog/bpfdoor-an-evasive-linux-backdoor-technical-analysis/
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--
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-- tags: persistent state filesystem
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SELECT
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file.path,
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file.directory,
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uid,
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gid,
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mode,
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file.mtime,
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file.size,
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hash.sha256,
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magic.data
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FROM
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file
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LEFT JOIN hash on file.path = hash.path
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LEFT JOIN magic ON file.path = magic.path
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WHERE
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(
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-- This list is the result of multiple queries combined and can likely be minimized
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file.path LIKE '/dev/%%'
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OR file.path LIKE '/dev/%%/%%'
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OR file.path LIKE '/dev/mqueue/%%'
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OR file.path LIKE '/dev/mqueue/.%/%%'
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OR file.path LIKE '/dev/mqueue/%/%%'
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OR file.path LIKE '/dev/mqueue/%/%/.%'
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OR file.path LIKE '/dev/mqueue/%/.%/%%'
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OR file.path LIKE '/dev/shm/%%'
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OR file.path LIKE '/dev/shm/.%/%%'
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OR file.path LIKE '/dev/shm/%/%%'
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OR file.path LIKE '/dev/shm/%/%/.%'
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OR file.path LIKE '/dev/shm/%/.%/%%'
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)
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AND file.type = 'regular'
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AND file.size > 64
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AND file.path NOT LIKE '%/../%'
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AND file.path NOT LIKE '%/./%'
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AND (
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file.mode LIKE '%7%'
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or file.mode LIKE '%5%'
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or file.mode LIKE '%1%'
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) -- Seen on Ubuntu
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AND NOT (
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file.uid = 1000
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AND file.gid = 1000
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AND file.mode = '0700'
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AND magic.data = 'data'
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AND file.path LIKE '/dev/shm/pulse-shm-%'
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AND file.size > 60000000
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) -- Seen with Steam
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AND NOT (
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file.uid = 1000
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AND file.gid IN (100, 1000)
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AND file.mode IN ('0755', '0775')
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AND magic.data IN (
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'data',
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'Applesoft BASIC program data, first line number 86',
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'mc68k executable (shared)',
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'OpenPGP Secret Key',
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'',
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'floppy image data (IBM SaveDskF, old)',
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'DOS executable (COM)'
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)
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AND file.path LIKE '/dev/shm/u1000-Shm_%'
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)
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AND NOT (
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file.uid = 1000
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AND file.gid IN (100, 1000)
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AND file.mode IN ('0755', '0775')
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AND magic.data IS NULL
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AND file.path LIKE '/dev/shm/u1000-Shm_%'
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)
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AND NOT (
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file.uid = 1000
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AND file.mode = '0755'
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AND file.path LIKE '/dev/shm/flatpak-com.valvesoftware.Steam-%/u1000-Shm_%'
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AND file.size > 1000000
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)
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