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Merge pull request #229 from tstromberg/split-chmod

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unexpected-chmod-exec: Split and Linux/macOS queries
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Thomas Strömberg 2023-03-17 15:39:26 -04:00 committed by GitHub
commit 1b9e2a6ec1
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 154 additions and 24 deletions
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2
detection/execution/exotic-command-events-macos.sql
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@ -103,7 +103,7 @@ WHERE
OR p0_name LIKE '%attack%' -- Unusual behaviors
OR p0_cmd LIKE '%powershell%'
OR p0_cmd LIKE '%chattr -i%'
OR p0.cmdline LIKE '%dd if=/dev/%'
OR p0_cmd LIKE '%dd if=/dev/%'
OR p0_cmd LIKE '%cat /dev/null >%'
OR p0_cmd LIKE '%truncate -s0 %'
OR p0_cmd LIKE '%touch%acmr%'

6
detection/execution/exotic-commands-macos.sql
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@ -94,12 +94,12 @@ WHERE
OR p.cmdline LIKE '%dd if=/dev/%'
)
AND NOT (
p0.cmdline LIKE '%UserKnownHostsFile=/dev/null%'
p0_cmd LIKE '%UserKnownHostsFile=/dev/null%'
AND p1.name == 'limactl'
)
AND NOT (
p0.cmdline LIKE '%sh -i'
AND p1.cmdline LIKE '%pipenv shell'
p0_cmd LIKE '%sh -i'
AND p1_cmd LIKE '%pipenv shell'
)
AND NOT p0_cmd IN ('pkill -f Jabra Direct')
GROUP BY

115
detection/execution/unexpected-chmod-exec-event-linux.sql Normal file
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@ -0,0 +1,115 @@
-- Things that call chmod to set executable permissions
--
-- references:
-- * https://www.microsoft.com/en-us/security/blog/2022/05/19/rise-in-xorddos-a-deeper-look-at-the-stealthy-ddos-malware-targeting-linux-devices/
--
-- false positives:
-- * loads of them
--
-- tags: transient process events
-- platform: linux
-- interval: 180
SELECT
IFNULL(
REGEX_MATCH (TRIM(pe.cmdline), '.* (/.*)', 1),
CONCAT (
pe.cwd,
'/',
REGEX_MATCH (TRIM(pe.cmdline), '.* (.*)', 1)
)
) AS f_path,
f.mode AS f_mode,
f.type AS f_type,
hash.sha256 AS f_hash,
magic.data AS f_magic,
-- Child
pe.path AS p0_path,
TRIM(pe.cmdline) AS p0_cmd,
pe.cwd AS p0_cwd,
pe.pid AS p0_pid,
-- Parent
pe.parent AS p1_pid,
p1.cgroup_path AS p1_cgroup,
TRIM(COALESCE(p1.cmdline, pe1.cmdline)) AS p1_cmd,
COALESCE(p1.path, pe1.path) AS p1_path,
COALESCE(p_hash1.sha256, pe_hash1.sha256) AS p1_hash,
REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) AS p1_name,
-- Grandparent
COALESCE(p1.parent, pe1.parent) AS p2_pid,
COALESCE(p1_p2.cgroup_path, pe1_p2.cgroup_path) AS p2_cgroup,
TRIM(
COALESCE(p1_p2.cmdline, pe1_p2.cmdline, pe1_pe2.cmdline)
) AS p2_cmd,
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path) AS p2_path,
COALESCE(
p1_p2_hash.path,
pe1_p2_hash.path,
pe1_pe2_hash.path
) AS p2_hash,
REGEX_MATCH (
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
'.*/(.*)',
1
) AS p2_name,
-- Exception key
REGEX_MATCH (pe.path, '.*/(.*)', 1) || ',' || MIN(pe.euid, 500) || ',' || REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) || ',' || REGEX_MATCH (
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
'.*/(.*)',
1
) AS exception_key
FROM
process_events pe
LEFT JOIN processes p ON pe.pid = p.pid
-- Wow, you can do that?
LEFT JOIN file f ON IFNULL(
REGEX_MATCH (TRIM(pe.cmdline), '.* (/.*)', 1),
CONCAT (
pe.cwd,
'/',
REGEX_MATCH (TRIM(pe.cmdline), '.* (.*)', 1)
)
) = f.path
LEFT JOIN hash ON f.path = hash.path
LEFT JOIN magic ON f.path = magic.path
-- Parents (via two paths)
LEFT JOIN processes p1 ON pe.parent = p1.pid
LEFT JOIN hash p_hash1 ON p1.path = p_hash1.path
LEFT JOIN process_events pe1 ON pe.parent = pe1.pid
AND pe1.cmdline != ''
LEFT JOIN hash pe_hash1 ON pe1.path = pe_hash1.path
-- Grandparents (via 3 paths)
LEFT JOIN processes p1_p2 ON p1.parent = p1_p2.pid -- Current grandparent via parent processes
LEFT JOIN processes pe1_p2 ON pe1.parent = pe1_p2.pid -- Current grandparent via parent events
LEFT JOIN process_events pe1_pe2 ON pe1.parent = pe1_p2.pid
AND pe1_pe2.cmdline != '' -- Past grandparent via parent events
LEFT JOIN hash p1_p2_hash ON p1_p2.path = p1_p2_hash.path
LEFT JOIN hash pe1_p2_hash ON pe1_p2.path = pe1_p2_hash.path
LEFT JOIN hash pe1_pe2_hash ON pe1_pe2.path = pe1_pe2_hash.path
WHERE
pe.pid IN (
SELECT DISTINCT
pid
FROM
process_events
WHERE
time > (strftime('%s', 'now') -180)
AND pe.syscall = "execve"
AND (
cmdline LIKE '%chmod% 7%'
OR cmdline LIKE '%chmod% +rwx%'
OR cmdline LIKE '%chmod% +x%'
OR cmdline LIKE '%chmod% u+x%'
OR cmdline LIKE '%chmod% a+x%'
)
AND cmdline NOT LIKE 'chmod 777 /app/%'
AND cmdline NOT LIKE 'chmod 700 /tmp/apt-key-gpghome.%'
AND cmdline NOT LIKE 'chmod 700 /home/%/snap/%/%/.config'
)
AND pe.syscall = "execve"
AND f.type != 'directory'
AND p1_cgroup NOT LIKE '/system.slice/docker-%'
AND p1_cgroup NOT LIKE '/user.slice/user-1000.slice/user@1000.service/user.slice/nerdctl-%'
AND p2_cgroup NOT LIKE '/system.slice/docker-%'
AND p2_cgroup NOT LIKE '/user.slice/user-1000.slice/user@1000.service/user.slice/nerdctl-%'
GROUP BY
p0_pid

55
detection/execution/unexpected-chmod-exec-event.sql → detection/execution/unexpected-chmod-exec-event-macos.sql
View File

@ -7,10 +7,17 @@
-- * loads of them
--
-- tags: transient process events
-- platform: posix
-- platform: darwin
-- interval: 180
SELECT
IFNULL(REGEX_MATCH(TRIM(pe.cmdline), '.* (/.*)', 1), CONCAT(pe.cwd, '/', REGEX_MATCH(TRIM(pe.cmdline), '.* (.*)', 1))) AS f_path,
IFNULL(
REGEX_MATCH (TRIM(pe.cmdline), '.* (/.*)', 1),
CONCAT (
pe.cwd,
'/',
REGEX_MATCH (TRIM(pe.cmdline), '.* (.*)', 1)
)
) AS f_path,
f.mode AS f_mode,
f.type AS f_type,
hash.sha256 AS f_hash,
@ -20,17 +27,14 @@ SELECT
TRIM(pe.cmdline) AS p0_cmd,
pe.cwd AS p0_cwd,
pe.pid AS p0_pid,
p.cgroup_path AS p0_cgroup,
-- Parent
pe.parent AS p1_pid,
p1.cgroup_path AS p1_cgroup,
TRIM(COALESCE(p1.cmdline, pe1.cmdline)) AS p1_cmd,
COALESCE(p1.path, pe1.path) AS p1_path,
COALESCE(p_hash1.sha256, pe_hash1.sha256) AS p1_hash,
REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) AS p1_name,
-- Grandparent
COALESCE(p1.parent, pe1.parent) AS p2_pid,
COALESCE(p1_p2.cgroup_path, pe1_p2.cgroup_path) AS p2_cgroup,
TRIM(
COALESCE(p1_p2.cmdline, pe1_p2.cmdline, pe1_pe2.cmdline)
) AS p2_cmd,
@ -55,7 +59,14 @@ FROM
process_events pe
LEFT JOIN processes p ON pe.pid = p.pid
-- Wow, you can do that?
LEFT JOIN file f ON IFNULL(REGEX_MATCH(TRIM(pe.cmdline), '.* (/.*)', 1), CONCAT(pe.cwd, '/', REGEX_MATCH(TRIM(pe.cmdline), '.* (.*)', 1))) = f.path
LEFT JOIN file f ON IFNULL(
REGEX_MATCH (TRIM(pe.cmdline), '.* (/.*)', 1),
CONCAT (
pe.cwd,
'/',
REGEX_MATCH (TRIM(pe.cmdline), '.* (.*)', 1)
)
) = f.path
LEFT JOIN hash ON f.path = hash.path
LEFT JOIN magic ON f.path = magic.path
-- Parents (via two paths)
@ -74,19 +85,23 @@ FROM
LEFT JOIN hash pe1_pe2_hash ON pe1_pe2.path = pe1_pe2_hash.path
WHERE
pe.pid IN (
SELECT DISTINCT pid FROM process_events WHERE
time > (strftime('%s', 'now') -180)
AND (
cmdline LIKE '%chmod% 7%'
OR cmdline LIKE '%chmod% +rwx%'
OR cmdline LIKE '%chmod% +x%'
OR cmdline LIKE '%chmod% u+x%'
OR cmdline LIKE '%chmod% a+x%'
)
AND cmdline NOT LIKE 'chmod 777 /app/%'
AND cmdline NOT LIKE 'chmod 700 /tmp/apt-key-gpghome.%'
AND cmdline NOT LIKE 'chmod 700 /home/%/snap/%/%/.config'
AND cmdline != 'chmod 0777 /Users/Shared/logitune'
SELECT DISTINCT
pid
FROM
process_events
WHERE
time > (strftime('%s', 'now') -180)
AND pe.status = 0
AND pe.parent > 0
AND (
cmdline LIKE '%chmod% 7%'
OR cmdline LIKE '%chmod% +rwx%'
OR cmdline LIKE '%chmod% +x%'
OR cmdline LIKE '%chmod% u+x%'
OR cmdline LIKE '%chmod% a+x%'
)
AND cmdline != 'chmod 0777 /Users/Shared/logitune'
)
AND f.type != 'directory'
GROUP BY p0_pid
GROUP BY
p0_pid