From e39d857a111c5ad038fcb6f6982ddb3ff10f19cc Mon Sep 17 00:00:00 2001 From: Craig Chamberlain Date: Thu, 24 Sep 2020 09:07:34 -0400 Subject: [PATCH] [New Rule] Unusual Linux System Network Configuration Discovery (#265) * Create ml_linux_system_network_configuration_discovery.toml ML rule to accompany the network configuration discovery job * Update ml_linux_system_network_configuration_discovery.toml added fp field * Update ml_linux_system_network_configuration_discovery.toml * Update ml_linux_system_network_configuration_discovery.toml linting * Update ml_linux_system_network_configuration_discovery.toml * Update ml_linux_system_network_configuration_discovery.toml * Update rules/ml/ml_linux_system_network_configuration_discovery.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> --- ...ystem_network_configuration_discovery.toml | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 rules/ml/ml_linux_system_network_configuration_discovery.toml diff --git a/rules/ml/ml_linux_system_network_configuration_discovery.toml b/rules/ml/ml_linux_system_network_configuration_discovery.toml new file mode 100644 index 000000000..4930ea302 --- /dev/null +++ b/rules/ml/ml_linux_system_network_configuration_discovery.toml @@ -0,0 +1,43 @@ +[metadata] +creation_date = "2020/09/03" +ecs_version = ["1.6.0"] +maturity = "production" +updated_date = "2020/09/03" + +[rule] +anomaly_threshold = 25 +author = ["Elastic"] +description = """ +Looks for commands related to system network configuration discovery from an unusual user context. This can be due to +uncommon troubleshooting activity or due to a compromised account. A compromised account may be used by a threat actor +to engage in system network configuration discovery in order to increase their understanding of connected networks and +hosts. This information may be used to shape follow-up behaviors such as lateral movement or additional discovery. +""" +false_positives = [ + """ + Uncommon user command activity can be due to an engineer logging onto a server instance in order to perform manual + troubleshooting or reconfiguration. + """, +] +from = "now-45m" +interval = "15m" +license = "Elastic License" +machine_learning_job_id = "linux_network_configuration_discovery" +name = "Unusual Linux System Network Configuration Discovery" +risk_score = 21 +rule_id = "f9590f47-6bd5-4a49-bd49-a2f886476fb9" +severity = "low" +tags = ["Elastic", "Linux", "ML"] +type = "machine_learning" +[[rule.threat]] +framework = "MITRE ATT&CK" +[[rule.threat.technique]] +id = "T1016" +name = "System Network Configuration Discovery" +reference = "https://attack.mitre.org/techniques/T1016/" + + +[rule.threat.tactic] +id = "TA0007" +name = "Discovery" +reference = "https://attack.mitre.org/tactics/TA0007/"