env binary shell evasion threat (#1793)

* new:rule:issue-1786 Adding a new Rule for env binary shell evasion threat * new:rule:issue-1786 Adding a new Rule for env binary shell evasion threat * Update rules/linux/env_binary_shell_evasion.toml * Update rules/linux/env_binary_shell_evasion.toml * new:rule:issue-1786 Adding Mittre Attack Techniques * new:rule:issue-1786 Adding Mittre Attack Techniques * new:rule:issue-1786 Adding Mittre Attack Techniques * new:rule:issue-1786 Adding Mittre Attack Techniques * new:rule:issue-1786 Adding Mittre Attack Techniques * Update rules/linux/privilege_escalation_env_binary.toml Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> * Update rules/linux/privilege_escalation_env_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/privilege_escalation_env_binary.toml * Update rules/linux/privilege_escalation_env_binary.toml * new:rule:issue-1786 Review Comments * Update rules/linux/defense_evasion_env_binary.toml Co-authored-by: Colson Wilhoit <48036388+DefSecSentinel@users.noreply.github.com> Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
2022-03-02 21:47:01 +05:30
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commit 758784d4d5
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+[metadata]
+creation_date = "2022/02/24"
+maturity = "production"
+updated_date = "2022/02/24"
+
+[rule]
+author = ["Elastic"]
+description = "Identifies Linux binary env abuse to break out from restricted environments by spawning an interactive system shell"
+from = "now-9m"
+index = ["logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License v2"
+name = "Linux Restricted Shell Breakout via env Shell Evasion"
+references = ["https://gtfobins.github.io/gtfobins/env/"]
+risk_score = 47
+rule_id = "72d33577-f155-457d-aad3-379f9b750c97"
+severity = "medium"
+tags = ["Elastic", "Host", "Linux", "Threat Detection", "Defense Evasion", "GTFOBins"]
+timestamp_override = "event.ingested"
+type = "eql"
+
+query = '''
+process where event.type == "start" and process.name : "env" and process.args_count == 2 and process.args : ("/bin/sh", "/bin/bash", "sh", "bash")
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1548"
+name = "Abuse Elevation Control Mechanism"
+reference = "https://attack.mitre.org/techniques/T1548/"
+[[rule.threat.technique.subtechnique]]
+id = "T1548.004"
+name = "Elevated Execution with Prompt"
+reference = "https://attack.mitre.org/techniques/T1548/004/"
+
+
+
+[rule.threat.tactic]
+id = "TA0005"
+name = "Defense Evasion"
+reference = "https://attack.mitre.org/tactics/TA0005/"
+