Terrance DeJesus
f0b2cb7c87
* added 'Uncommon Process Execution from Suspicious Directory' hunt * adds all linux hunting files * moves linux hunting files to queries folder * adds generated docs * fixing windows hunts * fixing windows hunts * updated README * Removed 2, updated a few, changed some names/descriptions and added list of str * updated windows for language schema changes, regenerated docs; updated README and index * changed UUIDs to hex only with standard hyphen format * removing unecessary docs * Fixed queries based on Samir feedback * ++ * regenerating linux docs * Update hunting/linux/queries/command_and_control_via_network_connections_with_low_occurrence_frequency_for_unique_agents.toml Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> * Update hunting/linux/queries/defense_evasion_via_hidden_process_execution.toml Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> * Update hunting/linux/queries/command_and_control_via_unusual_file_downloads_from_source_addresses.toml Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> * Update hunting/linux/queries/defense_evasion_via_capitalized_process_execution.toml Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> * Update hunting/linux/queries/defense_evasion_via_hidden_process_execution.toml Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> * Updates * Update * Update hunting/linux/queries/command_and_control_via_network_connections_with_low_occurrence_frequency_for_unique_agents.toml Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> * Updates * regenerating linux docs --------- Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com> Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>
69 lines
2.9 KiB
TOML
69 lines
2.9 KiB
TOML
[hunt]
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author = "Elastic"
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description = """
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This hunt identifies potential persistence mechanisms via the message-of-the-day (motd) on Linux systems. It monitors for file creation or modification events in the /etc/update-motd.d directory and processes started by these motd scripts. These scripts launch on SSH/terminal connection events, and execute the scripts as root. These activities can indicate attempts to establish persistence through motd modifications.
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"""
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integration = ["endpoint"]
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uuid = "5984a354-d76c-43e6-bdd9-228456f1b371"
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name = "Persistence via Message-of-the-Day"
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language = ["ES|QL", "SQL"]
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license = "Elastic License v2"
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notes = [
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"This hunt includes multiple ES|QL and OSQuery queries to identify potential persistence mechanisms via the message-of-the-day (motd) on Linux systems.",
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"Detects file creation or modification events in the /etc/update-motd.d directory, which is used for message-of-the-day scripts.",
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"Excludes common legitimate processes to minimize false positives.",
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"Uses EVAL to tag potential persistence events and counts occurrences to identify unusual activity.",
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"Monitors processes started by motd scripts to detect potential persistence mechanisms.",
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"OSQuery query is provided to complement the detection by retrieving detailed file information related to motd scripts."
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]
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mitre = ["T1036.005", "T1546.003"]
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query = [
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'''
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from logs-endpoint.events.file-*
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| where @timestamp > now() - 30 day
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| where host.os.type == "linux" and event.type in ("creation", "change") and file.path like "/etc/update-motd.d/*" and
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not process.name in ("dpkg", "dockerd", "yum", "dnf", "snapd", "pacman")
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| eval persistence = case(file.path like "/etc/update-motd.d/*", process.name, null)
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| stats pers_count = count(persistence), agent_count = count_distinct(agent.id) by process.executable, file.path
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| where pers_count > 0 and pers_count <= 20 and agent_count <= 5
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| sort pers_count asc
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| limit 100
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''',
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'''
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from logs-endpoint.events.process-*
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| where @timestamp > now() - 30 day
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| where host.os.type == "linux" and event.action == "exec" and event.type == "start" and process.parent.executable like "/etc/update-motd.d/*" and
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not process.args like "/tmp/tmp.*"
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| stats cc = count(), host_count = count_distinct(host.name) by process.executable, process.parent.executable
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| where host_count <= 5
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| sort cc asc
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| limit 100
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''',
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'''
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SELECT
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f.filename,
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f.path,
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u.username AS file_owner,
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g.groupname AS group_owner,
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datetime(f.atime, 'unixepoch') AS file_last_access_time,
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datetime(f.mtime, 'unixepoch') AS file_last_modified_time,
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datetime(f.ctime, 'unixepoch') AS file_last_status_change_time,
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datetime(f.btime, 'unixepoch') AS file_created_time,
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f.size AS size_bytes,
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h.md5
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FROM
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file f
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LEFT JOIN
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users u ON f.uid = u.uid
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LEFT JOIN
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groups g ON f.gid = g.gid
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LEFT JOIN
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hash h ON f.path = h.path
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WHERE
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f.directory IN ('/etc/update-motd.d/')
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ORDER BY
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f.mtime DESC;
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'''
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]
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