MSR Write Access Enabled

[rule]
description = """
This rule detects the enabling of write access to the Model Specific Registers (MSR) through the modprobe command. The
MSR provides a mechanism for the operating system to interact with the processor's hardware. Enabling write access to
the MSR may allow an attacker to modify the processor's configuration. This activity is seen by adversaries as a way to
increase mining performance or to bypass security mechanisms.
"""
id = "4342c282-ee21-4140-8e27-4e0f551489ef"
license = "Elastic License v2"
name = "MSR Write Access Enabled"
os_list = ["linux"]
reference = ["https://linux.die.net/man/8/modprobe"]
version = "1.0.3"

query = '''
process where event.type == "start" and event.action == "exec" and process.name == "modprobe" and
process.args == "msr" and process.args == "allow_writes=on"
'''

min_endpoint_version = "7.15.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0

[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 0

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"
[[threat.technique.subtechnique]]
id = "T1059.004"
name = "Unix Shell"
reference = "https://attack.mitre.org/techniques/T1059/004/"



[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1496"
name = "Resource Hijacking"
reference = "https://attack.mitre.org/techniques/T1496/"


[threat.tactic]
id = "TA0040"
name = "Impact"
reference = "https://attack.mitre.org/tactics/TA0040/"

[internal]
min_endpoint_version = "7.15.0"