New detector: overwritten memory map

detection/evasion/overwritten-memory-map-ddexec-linux.sql

@@ -0,0 +1,49 @@
+-- Processes with a memory map that suggests they might be code smuggling.
+--
+-- references:
+--   * https://github.com/arget13/DDexec
+--
+-- tags: persistent daemon seldom
+SELECT
+  pmm.path AS mmap_path,
+  pmm.start as mmap_start,
+  pmm.end AS mmap_end,
+  -- Child
+  p0.pid AS p0_pid,
+  p0.path AS p0_path,
+  p0.name AS p0_name,
+  p0.cmdline AS p0_cmd,
+  p0.cwd AS p0_cwd,
+  p0.cgroup_path AS p0_cgroup,
+  p0.euid AS p0_euid,
+  p0_hash.sha256 AS p0_sha256,
+  -- Parent
+  p0.parent AS p1_pid,
+  p1.path AS p1_path,
+  p1.name AS p1_name,
+  p1.euid AS p1_euid,
+  p1.cmdline AS p1_cmd,
+  p1_hash.sha256 AS p1_sha256,
+  -- Grandparent
+  p1.parent AS p2_pid,
+  p2.name AS p2_name,
+  p2.path AS p2_path,
+  p2.cmdline AS p2_cmd,
+  p2_hash.sha256 AS p2_sha256
+FROM
+  processes p0
+  LEFT JOIN process_memory_map pmm ON p0.pid = pmm.pid
+  LEFT JOIN file f ON p0.path = f.path
+  LEFT JOIN hash p0_hash ON p0.path = p0_hash.path
+  LEFT JOIN processes p1 ON p0.parent = p1.pid
+  LEFT JOIN hash p1_hash ON p1.path = p1_hash.path
+  LEFT JOIN processes p2 ON p1.parent = p2.pid
+  LEFT JOIN hash p2_hash ON p2.path = p2_hash.path
+WHERE
+  pmm.offset = 0
+  AND pmm.device = '00:00'
+  AND pmm.permissions = 'r--p'
+  AND pmm.pseudo = 0
+  and pmm.start LIKE '0x0%'
+GROUP BY
+  p0.pid;