Ruben Groenewoud
84824c67fd
* [Rule Tuning & New Rule] Linux Reverse Shell * [Tuning & New Rule] Linux Reverse Shells * Name change * Update rules/linux/execution_shell_via_child_tcp_utility_linux.toml Co-authored-by: shashank-elastic <91139415+shashank-elastic@users.noreply.github.com> * Update execution_shell_via_child_tcp_utility_linux.toml * Update execution_shell_via_background_process.toml --------- Co-authored-by: shashank-elastic <91139415+shashank-elastic@users.noreply.github.com>
59 lines
1.8 KiB
TOML
59 lines
1.8 KiB
TOML
[metadata]
|
|
creation_date = "2023/08/30"
|
|
integration = ["endpoint"]
|
|
maturity = "production"
|
|
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
|
|
min_stack_version = "8.3.0"
|
|
updated_date = "2023/11/22"
|
|
|
|
[rule]
|
|
author = ["Elastic"]
|
|
description = """
|
|
This rule monitors for the usage of the which command with an unusual amount of process arguments. Attackers may leverage
|
|
the which command to enumerate the system for useful installed utilities that may be used after compromising a system to
|
|
escalate privileges or move latteraly across the network.
|
|
"""
|
|
from = "now-119m"
|
|
interval = "60m"
|
|
index = ["logs-endpoint.events.*"]
|
|
language = "eql"
|
|
license = "Elastic License v2"
|
|
name = "Suspicious which Enumeration"
|
|
risk_score = 21
|
|
rule_id = "5b18eef4-842c-4b47-970f-f08d24004bde"
|
|
severity = "low"
|
|
tags = [
|
|
"Domain: Endpoint",
|
|
"OS: Linux",
|
|
"Use Case: Threat Detection",
|
|
"Tactic: Discovery",
|
|
"Data Source: Elastic Defend",
|
|
"Rule Type: BBR"
|
|
]
|
|
timestamp_override = "event.ingested"
|
|
type = "eql"
|
|
building_block_type = "default"
|
|
|
|
query = '''
|
|
process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
|
|
process.name == "which" and process.args_count >= 10 and not process.parent.name == "jem"
|
|
|
|
/* potential tuning if rule would turn out to be noisy
|
|
and process.args in ("nmap", "nc", "ncat", "netcat", nc.traditional", "gcc", "g++", "socat") and
|
|
process.parent.name in ("bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")
|
|
*/
|
|
'''
|
|
|
|
[[rule.threat]]
|
|
framework = "MITRE ATT&CK"
|
|
|
|
[[rule.threat.technique]]
|
|
id = "T1082"
|
|
name = "System Information Discovery"
|
|
reference = "https://attack.mitre.org/techniques/T1082/"
|
|
|
|
[rule.threat.tactic]
|
|
id = "TA0007"
|
|
name = "Discovery"
|
|
reference = "https://attack.mitre.org/tactics/TA0007/"
|