mirror of
https://github.com/splunk/security_content
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divious1
90 lines
3.8 KiB
JSON
90 lines
3.8 KiB
JSON
{
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"asset_type": "Endpoint",
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"channel": "ESCU",
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"confidence": "medium",
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"correlation_rule": {
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"notable": {
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"nes_fields": "dest, user, process_name",
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"rule_description": "The system $dest$ had reg.exe process run not initiated by a user.",
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"rule_title": "Suspicious reg.exe process detected on $dest$"
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},
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"risk": {
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"risk_object": "dest",
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"risk_object_type": [
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"system"
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],
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"risk_score": 80
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},
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"suppress": {
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"suppress_fields": "dest, user",
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"suppress_period": "14400s"
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}
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},
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"creation_date": "2017-10-11",
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"data_metadata": {
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"data_models": [
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"Endpoint"
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],
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"data_source": [
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"Endpoint Intel"
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],
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"providing_technologies": [
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"Carbon Black Response",
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"CrowdStrike Falcon",
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"Sysmon",
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"Tanium",
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"Ziften"
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]
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},
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"eli5": "This search looks for the execution of reg.exe with a parent process of cmd.exe. It then executes a subsearch looking for those cmd.exe processes with a parent that is not explorer.exe. It then joins those two searches to make sure that the reg.exe process is a grandchild of the non explorer.exe process. The search will return the number of such instances and the first and last time this activity has been seen on each endpoint and user.",
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"how_to_implement": "You must be ingesting data that records process activity from your hosts to populate the Endpoint data model in the Processes node. You must also be ingesting logs with both the process name and command line from your endpoints. The command-line arguments are mapped to the \"process\" field in the Endpoint data model.",
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"known_false_positives": "It's possible for system administrators to write scripts that exhibit this behavior. If this is the case, the search will need to be modified to filter them out.",
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"maintainers": [
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{
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"company": "Splunk",
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"email": "davidd@splunk.com",
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"name": "David Dorsey"
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}
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],
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"mappings": {
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"cis20": [
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"CIS 8"
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],
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"kill_chain_phases": [
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"Actions on Objectives"
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],
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"mitre_attack": [
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"Defense Evasion",
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"Modify Registry",
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"Disabling Security Tools"
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],
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"nist": [
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"DE.CM"
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]
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},
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"modification_date": "2019-03-01",
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"original_authors": [
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{
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"company": "Splunk",
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"email": "davidd@splunk.com",
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"name": "David Dorsey"
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}
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],
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"references": [
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"https://car.mitre.org/wiki/CAR-2013-03-001"
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],
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"scheduling": {
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"cron_schedule": "0 * * * *",
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"earliest_time": "-70m@m",
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"latest_time": "-10m@m"
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},
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"search": "| tstats `summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Processes where Processes.parent_process_name != explorer.exe Processes.process_name =cmd.exe by Processes.user Processes.process_name Processes.parent_process_name Processes.dest Processes.process_id Processes.parent_process_id | `drop_dm_object_name(\"Processes\")` | `ctime(firstTime)` | `ctime(lastTime)` | search [| tstats `summariesonly` count FROM datamodel=Endpoint.Processes where Processes.parent_process_name=cmd.exe Processes.process_name= reg.exe by Processes.parent_process_id Processes.dest Processes.process_name | `drop_dm_object_name(\"Processes\")` | `ctime(firstTime)` | `ctime(lastTime)` | rename parent_process_id as process_id |dedup process_id| table process_id dest]",
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"search_description": "This search looks for reg.exe being launched from a command prompt not started by the user. When a user launches cmd.exe, the parent process is usually explorer.exe. This search filters out those instances.",
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"search_id": "a6b3ab4e-dd77-4213-95fa-fc94701995e0",
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"search_name": "Suspicious Reg.exe Process",
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"search_type": "detection",
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"security_domain": "endpoint",
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"spec_version": 1,
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"version": "2.0"
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}
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