mirror of
https://github.com/chainguard-dev/osquery-defense-kit
synced 2024-12-18 12:04:32 +00:00
209 lines
6.5 KiB
SQL
209 lines
6.5 KiB
SQL
-- Suspicious URL requests by built-in fetching tools (event-based)
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--
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-- refs:
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-- * https://attack.mitre.org/techniques/T1105/ (Ingress Tool Transfer)
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-- * https://attack.mitre.org/techniques/T1571/ (Non-Standard Port)
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--
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-- interval: 120
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-- tags: transient process events
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-- platform: posix
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SELECT
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-- Child
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pe.path AS p0_path,
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REGEX_MATCH (pe.path, '.*/(.*)', 1) AS p0_name,
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TRIM(pe.cmdline) AS p0_cmd,
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pe.cwd AS p0_cwd,
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pe.pid AS p0_pid,
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pe.time AS p0_time,
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p.cgroup_path AS p0_cgroup,
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-- Parent
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pe.parent AS p1_pid,
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p1.cgroup_path AS p1_cgroup,
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TRIM(COALESCE(p1.cmdline, pe1.cmdline)) AS p1_cmd,
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COALESCE(p1.path, pe1.path) AS p1_path,
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COALESCE(p_hash1.sha256, pe_hash1.sha256) AS p1_hash,
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REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) AS p1_name,
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-- Grandparent
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COALESCE(p1.parent, pe1.parent) AS p2_pid,
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COALESCE(p1_p2.cgroup_path, pe1_p2.cgroup_path) AS p2_cgroup,
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TRIM(
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COALESCE(p1_p2.cmdline, pe1_p2.cmdline, pe1_pe2.cmdline)
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) AS p2_cmd,
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COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path) AS p2_path,
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COALESCE(
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p1_p2_hash.path,
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pe1_p2_hash.path,
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pe1_pe2_hash.path
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) AS p2_hash,
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REGEX_MATCH (
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COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
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'.*/(.*)',
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1
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) AS p2_name,
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-- Extra fields
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REGEX_MATCH (pe.cmdline, '(\w+:\/\/.*)\b', 1) AS url,
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REGEX_MATCH (pe.cmdline, '[ /](\d+\.\d+\.\d+\.\d+)[:/]', 1) AS ip,
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REGEX_MATCH (pe.cmdline, ':(\d+)', 1) AS port,
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REGEX_MATCH (pe.cmdline, '//([\w\-\.]+)[:/]', 1) AS addr,
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REGEX_MATCH (pe.cmdline, '//[\w\-\.]+\.(\w+)[:/]', 1) AS tld
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FROM
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process_events pe,
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uptime
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LEFT JOIN processes p ON pe.pid = p.pid
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-- Parents (via two paths)
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LEFT JOIN processes p1 ON pe.parent = p1.pid
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LEFT JOIN hash p_hash1 ON p1.path = p_hash1.path
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LEFT JOIN process_events pe1 ON pe.parent = pe1.pid
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AND pe1.cmdline != ''
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LEFT JOIN hash pe_hash1 ON pe1.path = pe_hash1.path
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-- Grandparents (via 3 paths)
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LEFT JOIN processes p1_p2 ON p1.parent = p1_p2.pid -- Current grandparent via parent processes
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LEFT JOIN processes pe1_p2 ON pe1.parent = pe1_p2.pid -- Current grandparent via parent events
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LEFT JOIN process_events pe1_pe2 ON pe1.parent = pe1_p2.pid
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AND pe1_pe2.cmdline != '' -- Past grandparent via parent events
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LEFT JOIN hash p1_p2_hash ON p1_p2.path = p1_p2_hash.path
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LEFT JOIN hash pe1_p2_hash ON pe1_p2.path = pe1_p2_hash.path
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LEFT JOIN hash pe1_pe2_hash ON pe1_pe2.path = pe1_pe2_hash.path
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-- Extra fields
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WHERE
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pe.time > (strftime('%s', 'now') -120)
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AND pe.cmdline != ''
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-- NOTE: Sync remaining portion with sketchy-fetchers
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AND (
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INSTR(pe.cmdline, 'wget ') > 0
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OR INSTR(pe.cmdline, 'curl ') > 0
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)
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-- Sketchy fetcher events always seem to contain a switch
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AND pe.cmdline LIKE '%-%'
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AND pe.cmdline LIKE '%/%'
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AND (
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-- If it's an IP or port, it's suspicious
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ip NOT IN ('', '127.0.0.1', '0.0.0.0', '::1')
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OR port != ''
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OR tld NOT IN (
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'',
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'app',
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'ca',
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'cloud',
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'com',
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'de',
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'dev',
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'edu',
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'fun',
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'gov',
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'io',
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'md',
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'mil',
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'net',
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'org',
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'se',
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'sh',
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'so',
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'uk',
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'us'
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)
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-- Or if it matches weird keywords we've seen
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OR p.cmdline LIKE '%chmod%'
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OR pe.cmdline LIKE '%.onion%'
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OR pe.cmdline LIKE '%tor2web%'
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OR pe.cmdline LIKE '%aliyun%'
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OR pe.cmdline LIKE '%pastebin%'
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OR pe.cmdline LIKE '%curl.*—write-out%'
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OR pe.cmdline LIKE '%curl %--user-agent%'
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OR pe.cmdline LIKE '%curl -k%'
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OR pe.cmdline LIKE '%curl -sL %'
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OR pe.cmdline LIKE '%curl%-o-%'
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OR pe.cmdline LIKE '%curl%--connect-timeout%'
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OR pe.cmdline LIKE '%curl%--output /dev/null%'
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OR pe.cmdline LIKE '%curl%--O /dev/null%'
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OR pe.cmdline LIKE '%curl%--insecure%'
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OR pe.cmdline LIKE '%wget %--user-agent%'
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OR pe.cmdline LIKE '%wget %--no-check-certificate%'
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OR pe.cmdline LIKE '%wget -nc%'
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OR pe.cmdline LIKE '%wget -q%'
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OR pe.cmdline LIKE '%wget -t%'
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-- Or anything launched by a system user
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OR (
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pe.cmdline LIKE '%wget -%'
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AND pe.euid < 500
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AND p.cgroup_path NOT LIKE '/system.slice/docker-%'
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)
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OR (
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pe.cmdline LIKE '%curl %'
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AND pe.euid < 500
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AND pe.cmdline NOT LIKE "%./configure %--with-curl%"
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AND p.cgroup_path NOT LIKE '/system.slice/docker-%'
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)
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)
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-- Exceptions for all calls
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AND NOT (
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pe.euid > 500
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AND (
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pe.cmdline LIKE '%--dump-header%'
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OR pe.cmdline LIKE '%127.0.0.1:%'
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OR pe.cmdline LIKE '% localhost:%'
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OR pe.cmdline LIKE '%/192.168.%:%'
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OR pe.cmdline LIKE '%application/json%'
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OR pe.cmdline LIKE '%/chainctl_%'
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OR pe.cmdline LIKE '%ctlog%'
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OR pe.cmdline LIKE '%curl -X %'
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OR pe.cmdline LIKE '%Authorization: Bearer%'
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OR pe.cmdline LIKE 'git %'
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OR pe.cmdline LIKE '%go mod %'
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OR pe.cmdline LIKE '%grpcurl%'
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OR pe.cmdline LIKE '%Homebrew%'
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OR pe.cmdline LIKE '%https://api.github.com/%'
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OR pe.cmdline LIKE '%If-None-Match%'
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OR pe.cmdline LIKE "%libcurl%"
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OR pe.cmdline LIKE '%LICENSES/vendor/%'
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OR pe.cmdline LIKE '%localhost:%'
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OR pe.cmdline LIKE '%/openid/v1/jwks%'
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OR pe.cmdline LIKE '%--progress-bar%'
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OR pe.cmdline LIKE '%.well-known/openid-configuration%'
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OR pe.cmdline LIKE 'wget --no-check-certificate https://github.com/%'
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OR pe.cmdline LIKE 'curl -sL wttr.in%'
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OR p1_cmd LIKE '%brew.rb%'
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OR p1_cmd LIKE '%brew.sh%'
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)
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)
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AND NOT (
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pe.euid > 500
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AND pe.cmdline LIKE '%/api'
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AND pe.cmdline NOT LIKE '%-o%'
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AND pe.cmdline NOT LIKE '%-O%'
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)
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AND NOT (
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pe.euid > 500
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-- /usr/bin/curl https://34.117.0.114:443 -k
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AND REGEX_MATCH(pe.cmdline, '(curl https://[\w\.\:\/]+ -k)$', 1) != ""
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)
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AND NOT (
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pe.euid > 500
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-- /usr/bin/curl -k https://34.117.0.114:443
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AND REGEX_MATCH(pe.cmdline, '(curl -k https://[\w\.\:\/]+)$', 1) != ""
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)
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-- These are typically curl -k calls
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-- We need the addr "IS NOT NULL" to avoid filtering out
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-- NULL entries
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AND NOT (
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addr IS NOT NULL
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AND (
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addr IN (
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'releases.hashicorp.com',
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'github.com',
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'cdn.zoom.us',
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'repo1.maven.org',
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'dl.enforce.dev'
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)
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-- Ignore local addresses (Docker development)
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OR addr NOT LIKE '%.%'
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OR ip LIKE '172.2%'
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OR ip LIKE '192.168.%'
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OR ip LIKE '127.%'
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OR ip LIKE '10.%'
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)
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)
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AND NOT p1_cmd LIKE '/usr/bin/bash /usr/bin/makepkg %'
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AND NOT url in ('https://aur.archlinux.org')
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