Add unexpected libcurl detector

detection/c2/unexpected-libcurl-user-linux.sql

@@ -0,0 +1,72 @@
+-- Find programs processes which link against libcurl, common among cross-platform malware
+--
+-- References:
+--  * https://objective-see.org/blog/blog_0x6C.html
+--  * https://objective-see.org/blog/blog_0x72.html
+--
+-- platform: linux
+-- tags: persistent state process seldom
+SELECT CONCAT (
+        p0.name,
+        ',',
+        REPLACE(
+            p0.path,
+            COALESCE(
+                REGEX_MATCH (p0.path, "/nix/store/(.*?)/.*", 1),
+                REGEX_MATCH (p0.path, "(\d[\.\d]+)/.*", 1),
+                "3.11"
+            ),
+            "__VERSION__"
+        ),
+        ',',
+        p0.euid,
+        ',',
+        CONCAT (
+            SPLIT (p0.cgroup_path, "/", 0),
+            ",",
+            SPLIT (p0.cgroup_path, "/", 1)
+        ),
+        ',',
+        f.mode
+    ) AS exception_key,
+    -- 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 file f ON p0.path = f.path
+    JOIN process_memory_map pmm ON p0.pid = pmm.pid
+    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 p0.euid = 0
+    AND pmm.path LIKE '%libcurl%'
+    AND NOT exception_key IN (
+        'flatpak-system-,/usr/libexec/flatpak-system-helper,0,system.slice,flatpak-system-helper.service,0755',
+        'fwupd,/usr/libexec/fwupd/fwupd,0,system.slice,fwupd.service,0755',
+        'fwupd,/usr/lib/fwupd/fwupd,0,system.slice,fwupd.service,0755',
+        'NetworkManager,/usr/bin/NetworkManager,0,system.slice,NetworkManager.service,0755',
+        'NetworkManager,/usr/sbin/NetworkManager,0,system.slice,NetworkManager.service,0755',
+        'packagekitd,/usr/libexec/packagekitd,0,system.slice,packagekit.service,0755'
+    )
+GROUP BY p0.pid

detection/c2/unexpected-libcurl-user-macos.sql

@@ -0,0 +1,47 @@
+-- Find programs processes which link against libcurl, common among cross-platform malware
+--
+-- References:
+--  * https://objective-see.org/blog/blog_0x6C.html
+--  * https://objective-see.org/blog/blog_0x72.html
+--
+-- platform: darwin
+-- tags: persistent state process seldom
+SELECT
+  s.authority,
+  s.identifier,
+  -- 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.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
+  JOIN process_memory_map pmm ON p0.pid = pmm.pid
+  LEFT JOIN signature s ON p0.path = s.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
+  p0.euid = 0
+  AND pmm.path LIKE '%libcurl%'
+  AND p0.name NOT IN ('nix-daemon', 'nix')
+GROUP BY
+  p0.pid