From da949b00517427009fd15ed7e86243c85b3f5db9 Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Fri, 4 Dec 2020 17:18:03 +0100
Subject: [PATCH] [New Rule] Potential SSH Bruteforce Detected (#538)

* [New Rule] Potential SSH Bruteforce Detected

* Update credential_access_potential_ssh_bruteforce.toml

* added parent process condition

* Update rules/macos/credential_access_potential_ssh_bruteforce.toml

Co-authored-by: Andrew Pease <7442091+peasead@users.noreply.github.com>

* spaces

* ecs_version

* Update rules/macos/credential_access_potential_ssh_bruteforce.toml

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>

* Update rules/macos/credential_access_potential_ssh_bruteforce.toml

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>

* Update rules/macos/credential_access_potential_ssh_bruteforce.toml

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>

Co-authored-by: Andrew Pease <7442091+peasead@users.noreply.github.com>
Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
---
 ...ntial_access_potential_ssh_bruteforce.toml | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 rules/macos/credential_access_potential_ssh_bruteforce.toml

diff --git a/rules/macos/credential_access_potential_ssh_bruteforce.toml b/rules/macos/credential_access_potential_ssh_bruteforce.toml
new file mode 100644
index 000000000..7de09f523
--- /dev/null
+++ b/rules/macos/credential_access_potential_ssh_bruteforce.toml
@@ -0,0 +1,44 @@
+[metadata]
+creation_date = "2020/11/16"
+maturity = "production"
+updated_date = "2020/11/16"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies a high number (20) of macOS SSH KeyGen process executions from the same host. An adversary may attempt a brute
+force attack to obtain unauthorized access to user accounts.
+"""
+from = "now-9m"
+index = ["auditbeat-*", "logs-endpoint.events.*"]
+language = "kuery"
+license = "Elastic License"
+name = "Potential SSH Brute Force Detected"
+references = ["https://themittenmac.com/detecting-ssh-activity-via-process-monitoring/"]
+risk_score = 47
+rule_id = "ace1e989-a541-44df-93a8-a8b0591b63c0"
+severity = "medium"
+tags = ["Elastic", "Host", "macOS", "Threat Detection", "Credential Access"]
+type = "threshold"
+
+query = '''
+event.category:process and event.type:start and process.name:"sshd-keygen-wrapper" and process.parent.name:launchd
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1110"
+name = "Brute Force"
+reference = "https://attack.mitre.org/techniques/T1110/"
+
+
+[rule.threat.tactic]
+id = "TA0006"
+name = "Credential Access"
+reference = "https://attack.mitre.org/tactics/TA0006/"
+
+[rule.threshold]
+field = "host.id"
+value = 20