API Call from Inaccessible Memory Page

[rule]
description = """
Identifies API calls from memory regions unexpectedly marked as inaccessible. This may indicate an attempt to hide
injected code from memory scanners.
"""
id = "2f4afc62-e9df-4654-b0c1-67ce380a1131"
license = "Elastic License v2"
name = "API Call from Inaccessible Memory Page"
os_list = ["windows"]
version = "1.0.3"

query = '''
api where
 process.Ext.api.name in ("VirtualProtect", "VirtualAlloc", "SetThreadContext", "MapViewOfFile", "MapViewOfFile2") and
 (process.thread.Ext.call_stack_final_user_module.name == "Unbacked" or
  process.thread.Ext.call_stack_final_user_module.allocation_private_bytes >= 100000) and
 _arraysearch(process.thread.Ext.call_stack, $entry,
              $entry.symbol_info == "Unbacked" and $entry.callsite_trailing_bytes like ("NOACCESS*", "GUARD*"))
'''

min_endpoint_version = "8.18.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0
tree = true

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1564"
name = "Hide Artifacts"
reference = "https://attack.mitre.org/techniques/T1564/"

[[threat.technique]]
id = "T1620"
name = "Reflective Code Loading"
reference = "https://attack.mitre.org/techniques/T1620/"


[threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"

[internal]
min_endpoint_version = "8.18.0"