Suspicious Curl File Download from Raw IP

[rule]
description = """
Detects when Curl makes an outbound network connection to a raw IP address in order to download a script (shell, apple,
or python) or unsigned/untrusted binary. Many different types of malware use this in order to download additional
payloads to a victim system.
"""
id = "19606783-671d-46cb-8a19-b96f96bf596a"
license = "Elastic License v2"
name = "Suspicious Curl File Download from Raw IP"
os_list = ["macos"]
version = "1.0.5"

query = '''
sequence by process.entity_id with maxspan=1m
[network where event.type == "start" and process.name in ("curl", "nscurl") and destination.domain == null and
   not cidrmatch(destination.ip, 
       "240.0.0.0/4", "233.252.0.0/24", "224.0.0.0/4", "198.19.0.0/16", "192.18.0.0/15", 
       "192.0.0.0/24", "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", 
       "192.0.2.0/24", "192.31.196.0/24", "192.52.193.0/24", "192.168.0.0/16", "192.88.99.0/24", 
       "100.64.0.0/10", "192.175.48.0/24", "198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24",
       "::1", "FE80::/10", "FF00::/8")]
[file where event.action == "modification" and file.extension in ("sh", "py", "scpt") and
  not Effective_process.executable like "/Library/Application Support/JAMF/Jamf.app/Contents/MacOS/JamfDaemon.app/Contents/MacOS/JamfDaemon"]
'''

min_endpoint_version = "8.16.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "Effective_process.entity_id"
state = 0

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

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1105"
name = "Ingress Tool Transfer"
reference = "https://attack.mitre.org/techniques/T1105/"


[threat.tactic]
id = "TA0011"
name = "Command and Control"
reference = "https://attack.mitre.org/tactics/TA0011/"

[internal]
min_endpoint_version = "8.16.0"