Colson Wilhoit
150ff0502e
* Linux Shell Evasion Rule Tuning * Update execution_python_tty_shell.toml * Update rules/linux/execution_apt_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_apt_binary.toml * Update rules/linux/execution_awk_binary_shell.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_awk_binary_shell.toml * Update rules/linux/execution_c89_c99_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_c89_c99_binary.toml * Update rules/linux/execution_cpulimit_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_cpulimit_binary.toml * Update rules/linux/execution_expect_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_expect_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_expect_binary.toml * Update rules/linux/execution_find_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_find_binary.toml * Update rules/linux/execution_gcc_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_gcc_binary.toml * Update rules/linux/execution_mysql_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_mysql_binary.toml * Update rules/linux/execution_nice_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_nice_binary.toml * Update rules/linux/execution_ssh_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_ssh_binary.toml * Update execution_perl_tty_shell.toml * Update execution_python_tty_shell.toml * Update rules/linux/execution_apt_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_awk_binary_shell.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_c89_c99_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_cpulimit_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_expect_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_find_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_gcc_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_mysql_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_nice_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/linux/execution_ssh_binary.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
45 lines
1.7 KiB
TOML
45 lines
1.7 KiB
TOML
[metadata]
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creation_date = "2020/02/18"
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maturity = "production"
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updated_date = "2021/03/03"
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[rule]
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author = ["Elastic"]
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description = """
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A netcat process is engaging in network activity on a Linux host. Netcat is often used as a persistence mechanism by
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exporting a reverse shell or by serving a shell on a listening port. Netcat is also sometimes used for data
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exfiltration.
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"""
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false_positives = [
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"""
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Netcat is a dual-use tool that can be used for benign or malicious activity. Netcat is included in some Linux
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distributions so its presence is not necessarily suspicious. Some normal use of this program, while uncommon, may
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originate from scripts, automation tools, and frameworks.
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""",
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]
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from = "now-9m"
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index = ["auditbeat-*", "logs-endpoint.events.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Netcat Network Activity"
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references = [
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"http://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet",
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"https://www.sans.org/security-resources/sec560/netcat_cheat_sheet_v1.pdf",
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"https://en.wikipedia.org/wiki/Netcat",
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]
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risk_score = 47
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rule_id = "adb961e0-cb74-42a0-af9e-29fc41f88f5f"
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severity = "medium"
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tags = ["Elastic", "Host", "Linux", "Threat Detection"]
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type = "eql"
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query = '''
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sequence by process.entity_id
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[process where (process.name == "nc" or process.name == "ncat" or process.name == "netcat" or
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process.name == "netcat.openbsd" or process.name == "netcat.traditional") and
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event.type == "start"]
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[network where (process.name == "nc" or process.name == "ncat" or process.name == "netcat" or
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process.name == "netcat.openbsd" or process.name == "netcat.traditional")]
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'''
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