awk binary shell evasion threat (#1794)

* new:rule:issue-1785 Adding a new Rule for awk binary shell evasion threat * Update rules/linux/awk_binary_shell_evasion.toml * Update rules/linux/awk_binary_shell_evasion.toml * new:rule:issue-1785 Adding Mittre Attack Techniques * new:rule:issue-1785 Adding Mittre Attack Techniques * new:rule:issue-1785 Adding Mittre Attack Techniques * Update rules/linux/privilege_escalation_awk_binary_shell.toml * Update rules/linux/privilege_escalation_awk_binary_shell.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/privilege_escalation_awk_binary_shell.toml Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> * Update rules/linux/privilege_escalation_awk_binary_shell.toml * Update rules/linux/privilege_escalation_awk_binary_shell.toml * Update rules/linux/privilege_escalation_awk_binary_shell.toml * Update rules/linux/privilege_escalation_awk_binary_shell.toml * Update rules/linux/privilege_escalation_awk_binary_shell.toml * new:rule:issue-1785 Review Comments * new:rule:issue-1785 Review Comments Co-authored-by: Colson Wilhoit <48036388+DefSecSentinel@users.noreply.github.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> (cherry picked from commit e004a2f4a5)
2022-03-02 21:53:49 +05:30
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+[metadata]
+creation_date = "2022/02/24"
+maturity = "production"
+updated_date = "2022/02/24"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies Linux binary awk abuse to breakout out of restricted shells or environments by spawning an
+interactive system shell. This activity is not standard use with this binary for a user or system administrator. It indicates a potentially malicious actor attempting to improve the capabilities or stability of their access.
+"""
+from = "now-9m"
+index = ["logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License v2"
+name = "Linux Restricted Shell Breakout via awk Commands"
+references = ["https://gtfobins.github.io/gtfobins/nawk/",
+              "https://gtfobins.github.io/gtfobins/mawk/"]
+risk_score = 47
+rule_id = "10754992-28c7-4472-be5b-f3770fd04f2d"
+severity = "medium"
+tags = ["Elastic", "Host", "Linux", "Threat Detection", "Defense Evasion", "GTFOBins"]
+timestamp_override = "event.ingested"
+type = "eql"
+
+query = '''
+sequence by host.id, process.pid with maxspan=1m 
+  [process where process.name : ("nawk", "mawk", "awk", "gawk") and process.args : "BEGIN {system(*)}"] 
+  [process where process.parent.name : ("nawk", "mawk", "awk", "gawk") and process.name : ("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/"