Potential Privilege Escalation via DLL Redirection

[rule]
description = """
Identifies attempts to load a module by a SYSTEM process and via side by side DLL redirection. This may indicate an
attempt to elevate privileges via DLL search order hijacking.
"""
id = "f5dd34c1-733c-43d7-831c-a4b0affb914a"
license = "Elastic License v2"
name = "Potential Privilege Escalation via DLL Redirection"
os_list = ["windows"]
reference = [
    "https://docs.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-redirection",
    "https://secret.club/2020/04/23/directory-deletion-shell.html",
    "https://www.elastic.co/security-labs/Hunting-for-Suspicious-Windows-Libraries-for-Execution-and-Evasion",
]
version = "1.0.30"

query = '''
library where user.id : "S-1-5-18" and
   dll.path : ("?:\\Windows\\system32\\*.exe.local\\*",
               "?:\\Windows\\syswow64\\*.exe.local\\*",
               "?:\\Program Files (x86)\\Microsoft\\*.exe.local\\*",
               "?:\\Program Files\\Microsoft\\*.exe.local\\*") and
  not (dll.code_signature.subject_name : "Microsoft *" and dll.code_signature.trusted == true) and
  process.executable :
               ("?:\\Windows\\system32\\*",
                "?:\\Windows\\syswow64\\*",
                "?:\\Program Files (x86)\\Microsoft\\*",
                "?:\\Program Files\\Microsoft\\*")
'''

min_endpoint_version = "7.16.0"
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0

[[optional_actions]]
action = "rollback"
field = "process.entity_id"
state = 0

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1129"
name = "Shared Modules"
reference = "https://attack.mitre.org/techniques/T1129/"


[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1574"
name = "Hijack Execution Flow"
reference = "https://attack.mitre.org/techniques/T1574/"
[[threat.technique.subtechnique]]
id = "T1574.001"
name = "DLL"
reference = "https://attack.mitre.org/techniques/T1574/001/"



[threat.tactic]
id = "TA0004"
name = "Privilege Escalation"
reference = "https://attack.mitre.org/tactics/TA0004/"

[internal]
min_endpoint_version = "7.16.0"