mirror of
https://github.com/splunk/security_content
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divious1
87 lines
2.9 KiB
JSON
87 lines
2.9 KiB
JSON
{
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"asset_type": "Endpoint",
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"channel": "ESCU",
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"confidence": "high",
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"correlation_rule": {
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"notable": {
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"nes_fields": "dest, file_name",
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"rule_description": "A file modification was detected on $dest$ with an extension commonly used by ransomware.",
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"rule_title": "Ransomware Extension 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,file_name",
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"suppress_period": "14400s"
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}
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},
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"creation_date": "2017-08-21",
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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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]
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},
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"eli5": "This search looks at file modifications across your hosts and identifies files with extensions that are commonly associated with the encrypted files generated by ransomware.",
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"how_to_implement": "You must be ingesting data that records the filesystem activity from your hosts to populate the Endpoint file-system data model node. If you are using Sysmon, you will need a Splunk Universal Forwarder on each endpoint from which you want to collect data.",
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"known_false_positives": "It is possible for a legitimate file with these extensions to be created. If this is a true ransomware attack, there will be a large number of files created with these extensions.",
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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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"company": "Splunk",
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"email": "bpatel@splunk.com",
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"name": "Bhavin Patel"
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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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"nist": [
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"PR.PT",
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"DE.CM"
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]
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},
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"modification_date": "2018-11-15",
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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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"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 values(Filesystem.user) as user values(Filesystem.dest) as dest values(Filesystem.file_path) as file_path from datamodel=Endpoint.Filesystem by Filesystem.file_name | `drop_dm_object_name(Filesystem)` | `ctime(lastTime)` | `ctime(firstTime)`| rex field=file_name \"(?<file_extension>\\.[^\\.]+)$\" | `ransomware_extensions`",
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"search_description": "The search looks for file modifications with extensions commonly used by Ransomware",
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"search_id": "a9e5c5db-db11-43ca-86a8-c852d1b2c0ec",
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"search_name": "Common Ransomware Extensions",
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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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