93 lines
3.6 KiB
SQL
93 lines
3.6 KiB
SQL
-- Catch applications running from unusual directories, such as /tmp (event-based)
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--
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-- references:
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-- * https://attack.mitre.org/techniques/T1074/
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--
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-- false positives:
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-- * programs running in alternative namespaces (Docker)
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--
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-- interval: 300
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-- platform: linux
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-- tags: process events
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SELECT -- 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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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(p1.euid, pe1.euid) AS p1_euid,
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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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FROM process_events pe
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LEFT JOIN processes p ON pe.pid = pe.pid -- 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 -- 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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WHERE pe.pid IN (
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SELECT pid
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FROM process_events
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WHERE time > (strftime('%s', 'now') -300)
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AND (
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INSTR(path, "/bin") != 1
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AND INSTR(path, "/sbin/") != 1
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AND INSTR(path, "/usr/bin/") != 1
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AND INSTR(path, "/usr/lib/") != 1
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AND INSTR(path, "/usr/lib64/") != 1
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AND INSTR(path, "/usr/libexec") != 1
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AND INSTR(path, "/usr/sbin/") != 1
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AND INSTR(path, "/home/") != 1
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AND INSTR(path, "/nix/") != 1
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AND INSTR(path, "/opt/") != 1
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AND INSTR(path, "/snap/") != 1
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AND INSTR(path, "/var/lib/snapd/") != 1
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AND INSTR(path, "/usr/share/spotify") != 1
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AND INSTR(path, "/usr/share/code/") != 1
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AND INSTR(path, "/usr/local/") != 1
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AND INSTR(path, "/tmp/go-build") != 1
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AND INSTR(path, "/app/") != 1
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AND INSTR(path, "/ko-app") != 1
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AND INSTR(path, "/usr/share/teams/") != 1
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AND INSTR(path, "/.terraform/") > 0
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)
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AND syscall = "execve" -- REGEX_MATCH performed terribly. INSTR and LIKE are very very close.
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GROUP BY path
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)
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AND pe.time > (strftime('%s', 'now') -300)
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AND pe.syscall = "execve"
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AND p.cgroup_path NOT LIKE '/system.slice/docker-%'
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AND p.cgroup_path NOT LIKE '/user.slice/user-1000.slice/user@1000.service/user.slice/nerdctl-%'
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AND p1.cgroup_path NOT LIKE '/system.slice/docker-%'
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AND p1.cgroup_path NOT LIKE '/user.slice/user-1000.slice/user@1000.service/user.slice/nerdctl-%'
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GROUP BY pe.pid |