[New Rule] Potential Reverse Shell Activity via Terminal (#821)

* [New Rule] Potential Reverse Shell Activity via Terminal * extra reference * adjusted process.args for coverage resilience * Update execution_revershell_via_shell_cmd.toml * Update rules/cross-platform/execution_revershell_via_shell_cmd.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> * Update rules/cross-platform/execution_revershell_via_shell_cmd.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * encoded ref url Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
2021-02-08 22:57:55 +01:00
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+[metadata]
+creation_date = "2020/01/07"
+maturity = "production"
+updated_date = "2020/01/07"
+
+[rule]
+author = ["Elastic"]
+description = "Identifies the execution of a shell process with suspicious arguments which may be indicative of reverse shell activity."
+from = "now-9m"
+index = ["auditbeat-*", "logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License"
+name = "Potential Reverse Shell Activity via Terminal"
+references = [
+    "https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Reverse%20Shell%20Cheatsheet.md",
+    "https://github.com/WangYihang/Reverse-Shell-Manager",
+    "https://www.netsparker.com/blog/web-security/understanding-reverse-shells/",
+]
+risk_score = 73
+rule_id = "a1a0375f-22c2-48c0-81a4-7c2d11cc6856"
+severity = "high"
+tags = ["Elastic", "Host", "Linux", "macOS", "Threat Detection", "Execution"]
+type = "eql"
+
+query = '''
+process where event.type in ("start", "process_started") and
+  process.name in ("sh", "bash", "zsh", "dash", "zmodload") and
+  process.args:("*/dev/tcp/*", "*/dev/udp/*", "zsh/net/tcp", "zsh/net/udp")
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1059"
+name = "Command and Scripting Interpreter"
+reference = "https://attack.mitre.org/techniques/T1059/"
+
+
+[rule.threat.tactic]
+id = "TA0002"
+name = "Execution"
+reference = "https://attack.mitre.org/tactics/TA0002/"