mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
bpatel
85 lines
3.0 KiB
JSON
85 lines
3.0 KiB
JSON
{
|
|
"channel": "ESCU",
|
|
"confidence": "medium",
|
|
"correlation_rule": {
|
|
"notable": {
|
|
"nes_fields": "dest, process, user",
|
|
"rule_description": "An unusually long command-line $cmdline$ was found on $dest$",
|
|
"rule_title": "Unusually Long Command-Line on $dest$"
|
|
},
|
|
"risk": {
|
|
"risk_object": "dest",
|
|
"risk_object_type": [
|
|
"system"
|
|
],
|
|
"risk_score": 50
|
|
},
|
|
"suppress": {
|
|
"suppress_fields": "dest,user,process",
|
|
"suppress_period": "28800s"
|
|
}
|
|
},
|
|
"creation_date": "2017-08-23",
|
|
"data_metadata": {
|
|
"data_models": [
|
|
"Endpoint"
|
|
],
|
|
"data_source": [
|
|
"Endpoint Intel"
|
|
],
|
|
"providing_technologies": [
|
|
"Carbon Black Response",
|
|
"CrowdStrike Falcon",
|
|
"Sysmon",
|
|
"Tanium",
|
|
"Ziften"
|
|
]
|
|
},
|
|
"eli5": "This search calculates the average and standard deviation for the length of the command-lines on each of your endpoints and alerts when a command-line is found with a length over 10 times the standard deviation larger than the average command-line.",
|
|
"how_to_implement": "You must be ingesting endpoint data that tracks process activity, including parent-child relationships from your endpoints to populate the Endpoint data model in the Processes node. The command-line arguments are mapped to the \"process\" field in the Endpoint data model. Please consider changing the value of threshold in the search for reducing false positives.",
|
|
"known_false_positives": "Some legitimate applications start with long command-lines.",
|
|
"maintainers": [
|
|
{
|
|
"company": "Splunk",
|
|
"email": "bpatel@splunk.com",
|
|
"name": "Bhavin Patel"
|
|
}
|
|
],
|
|
"mappings": {
|
|
"cis20": [
|
|
"CIS 8"
|
|
],
|
|
"kill_chain_phases": [
|
|
"Actions on Objectives"
|
|
],
|
|
"mitre_attack": [
|
|
"Execution"
|
|
],
|
|
"nist": [
|
|
"PR.PT",
|
|
"DE.CM"
|
|
]
|
|
},
|
|
"modification_date": "2019-02-28",
|
|
"original_authors": [
|
|
{
|
|
"company": "Splunk",
|
|
"email": "davidd@splunk.com",
|
|
"name": "David Dorsey"
|
|
}
|
|
],
|
|
"scheduling": {
|
|
"cron_schedule": "0 * * * *",
|
|
"earliest_time": "-1d@d",
|
|
"latest_time": "-10m@m"
|
|
},
|
|
"search": "| tstats `summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Processes by Processes.user Processes.dest Processes.process_name Processes.process | `drop_dm_object_name(\"Processes\")` | `ctime(firstTime)`| `ctime(lastTime)`| eval processlen=len(process) | eventstats stdev(processlen) as stdev, avg(processlen) as avg by dest | stats max(processlen) as maxlen, values(stdev) as stdevperhost, values(avg) as avgperhost by dest, user, process_name, process| eval threshold = 10 | where maxlen > ((threshold*stdevperhost) + avgperhost)",
|
|
"search_description": "Command-lines that are extremely long can be indicative of malicious activity on your hosts.",
|
|
"search_id": "c77162d3-f93c-45cc-80c8-22f6a4264e7f",
|
|
"search_name": "Unusually Long Command Line",
|
|
"search_type": "detection",
|
|
"security_domain": "endpoint",
|
|
"spec_version": 1,
|
|
"version": "2.0"
|
|
}
|