behavior/rules/windows/execution_suspicious_php_script_execution.toml

[rule]
description = """
Identifies the execution a PHP script utility that was recently dropped followed by an egress network activity or
spawning a suspicious child process.
"""
id = "fb54419b-1284-4e85-abfd-aac59db82c8b"
license = "Elastic License v2"
name = "Suspicious PHP Script Execution"
os_list = ["windows"]
version = "1.0.2"

query = '''
sequence with maxspan=5m
 [any where
  (
   (event.category == "process" and event.type == "start" and process.pe.original_file_name == "php.exe" and
    (process.Ext.relative_file_creation_time <= 300 or process.Ext.relative_file_name_modify_time <= 300) and
    process.executable : "C:\\*") or

   (event.category == "library" and event.action == "load" and dll.pe.original_file_name : ("php?.dll", "php.dll") and
    (dll.Ext.relative_file_creation_time <= 300 or dll.Ext.relative_file_name_modify_time <= 300) and
    process.executable : "C:\\*")
   ) and
  not process.executable : ("C:\\Program Files (x86)\\PHP\\php.exe", "C:\\Program Files\\*.exe")
 ] as event0
[any where
   /* spawn a child process */
   (event.category == "process" and event.action == "start" and process.name : ("cmd.exe", "powershell.exe") and
    process.parent.entity_id == event0.process.entity_id and
    not process.command_line : ("* /V:ON /E:ON /D*", "cmd.exe /c \"echo '%os%'\"",
                                "cmd.exe /s /c \"echo '%os%'\"", "cmd.exe /s /c \"mode CON\"",
                                "cmd.exe /s /c \"stty 2>&1\"", "cmd.exe /c \"stty 2> NUL\"", "cmd.exe /c mode CON")) or
   /* DNS lookup */
   (event.category == "dns" and process.entity_id == event0.process.entity_id and dns.question.name != null) or
   /* perform an egress conn to the internet */
   (event.category == "network" and event.action in ("disconnect_received", "connection_attempted") and
    process.entity_id == event0.process.entity_id and
    not cidrmatch(destination.ip, "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.0.0.0/24",
       "192.0.0.0/29", "192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32", "192.0.0.171/32",
       "192.0.2.0/24", "192.31.196.0/24", "192.52.193.0/24", "192.88.99.0/24", "224.0.0.0/4",
       "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", "240.0.0.0/4", "::1",
       "FE80::/10", "FF00::/8"))]
'''

min_endpoint_version = "8.4.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.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.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1071"
name = "Application Layer Protocol"
reference = "https://attack.mitre.org/techniques/T1071/"


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

[internal]
min_endpoint_version = "8.4.0"