mirror of
https://github.com/chainguard-dev/osquery-defense-kit
synced 2024-12-14 01:54:32 +00:00
47 lines
1.3 KiB
SQL
47 lines
1.3 KiB
SQL
-- Files where the timestamp falls along 12-hour boundaries - probably caused by 'touch <date>0000'
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--
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-- false positives:
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-- * 1 in 43200 chance per binary
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--
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-- references:
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-- * https://attack.mitre.org/techniques/T1070/006/ (Indicator Removal on Host: Timestomp)
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--
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-- tags: persistent seldom filesystem
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-- platform: linux
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SELECT
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file.path,
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DATETIME(file.mtime, 'unixepoch', 'localtime') AS mod_time,
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DATETIME(file.atime, 'unixepoch', 'localtime') AS access_time,
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file.inode,
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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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file.path LIKE "/bin/%%"
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OR file.path LIKE "/etc/%%"
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OR file.path LIKE "/sbin/%%"
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OR file.path LIKE "/lib/%%"
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OR file.path LIKE "/usr/%%"
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)
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-- This timestamp is in UTC
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AND file.mtime > (strftime('%s', 'now') - (86400 * 720))
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AND file.mtime % 3600 = 0
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-- Narrow down to specific offsets in the users local timezone (there should be a better way!)
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AND (
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mod_time LIKE "% 12:00:00"
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OR mod_time LIKE "% 00:00:00"
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)
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-- false positives
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AND file.path NOT IN (
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'/etc/master.passwd',
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'/usr/share/doc/strace/NEWS',
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'/bin/strace-log-merge',
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'/usr/bin/strace-log-merge'
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)
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AND file.path NOT LIKE '%/lynis%'
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AND file.path NOT LIKE '%/yelp-xsl%'
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