Jonhnathan
b4c84e8a40
* Update Tags * Bump updated date separately to be easy to revert if needed * Update resource_development_ml_linux_anomalous_compiler_activity.toml * Apply changes from the discussion * Update persistence_init_d_file_creation.toml * Update defense_evasion_timestomp_sysmon.toml * Update defense_evasion_application_removed_from_blocklist_in_google_workspace.toml * Update missing Tactic tags * Update unit tests to match new tags * Add missing IG tags * Delete okta_threat_detected_by_okta_threatinsight.toml * Update command_and_control_google_drive_malicious_file_download.toml * Update persistence_rc_script_creation.toml * Mass bump * Update persistence_shell_activity_by_web_server.toml * . --------- Co-authored-by: Mika Ayenson <Mika.ayenson@elastic.co> Co-authored-by: Mika Ayenson <Mikaayenson@users.noreply.github.com>
68 lines
2.8 KiB
TOML
68 lines
2.8 KiB
TOML
[metadata]
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creation_date = "2022/11/14"
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integration = ["endpoint"]
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maturity = "production"
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min_stack_comments = "New fields added: required_fields, related_integrations, setup"
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min_stack_version = "8.3.0"
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updated_date = "2023/06/22"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies a reverse shell via the abuse of named pipes on Linux with the help of OpenSSL or Netcat. First in, first out
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(FIFO) files are special files for reading and writing to by Linux processes. For this to work, a named pipe is created
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and passed to a Linux shell where the use of a network connection tool such as Netcat or OpenSSL has been established.
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The stdout and stderr are captured in the named pipe from the network connection and passed back to the shell for
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execution.
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"""
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false_positives = [
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"""
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Netcat and OpenSSL are common tools used for establishing network connections and creating encryption keys. While
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they are popular, capturing the stdout and stderr in a named pipe pointed to a shell is anomalous.
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""",
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]
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from = "now-9m"
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index = ["auditbeat-*", "logs-endpoint.events.*", "endgame-*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Reverse Shell Created via Named Pipe"
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references = [
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"https://int0x33.medium.com/day-43-reverse-shell-with-openssl-1ee2574aa998",
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"https://blog.gregscharf.com/2021/03/22/tar-in-cronjob-to-privilege-escalation/",
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"https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Reverse%20Shell%20Cheatsheet.md#openssl",
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]
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risk_score = 47
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rule_id = "dd7f1524-643e-11ed-9e35-f661ea17fbcd"
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Endgame"]
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type = "eql"
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query = '''
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sequence by host.id with maxspan = 5s
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[process where host.os.type == "linux" and event.type == "start" and process.executable : ("/usr/bin/mkfifo","/usr/bin/mknod") and process.args:("/tmp/*","$*")]
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[process where host.os.type == "linux" and process.executable : ("/bin/sh","/bin/bash") and process.args:("-i") or
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(process.executable: ("/usr/bin/openssl") and process.args: ("-connect"))]
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[process where host.os.type == "linux" and (process.name:("nc","ncat","netcat","netcat.openbsd","netcat.traditional") or
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(process.name: "openssl" and process.executable: "/usr/bin/openssl"))]
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1059"
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name = "Command and Scripting Interpreter"
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reference = "https://attack.mitre.org/techniques/T1059/"
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[[rule.threat.technique.subtechnique]]
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id = "T1059.004"
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name = "Unix Shell"
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reference = "https://attack.mitre.org/techniques/T1059/004/"
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[rule.threat.tactic]
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id = "TA0002"
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name = "Execution"
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reference = "https://attack.mitre.org/tactics/TA0002/"
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