Malicious Reputation of Executable Download

[rule]
description = """
Identifies Windows executable files that have been recently downloaded and have a malicious reputation. Attackers may
rely upon a user downloading and opening a file in order for their malicious code to execute and gain initial access to
an endpoint. Users may be subjected to social engineering to get them to open a file that will lead to code execution.
"""
id = "4348dc5e-b7de-4aa5-b6f1-20496f72547b"
license = "Elastic License v2"
name = "Malicious Reputation of Executable Download"
os_list = ["windows"]
version = "1.0.7"

query = '''
process where event.action == "start" and
 (process.Ext.relative_file_creation_time <= 1800 or process.Ext.relative_file_name_modify_time <= 1800) and
 (process.code_signature.trusted == false or process.code_signature.exists == false) and
 not process.code_signature.status : ("errorExpired", "errorCode_endpoint*") and

  (process.executable : ("?:\\Users\\*\\Downloads\\*", "*\\AppData\\Local\\Temp\\*", "?:\\Users\\*\\Desktop\\*") and
  /* Direct Child */
   process.parent.name : ("explorer.exe", "chrome.exe", "msedge.exe", "firefox.exe", "7zFM.exe", "iexplore.exe", "winrar.exe"))
'''

min_endpoint_version = "8.10.0"
reputation = true
[[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 = "T1204"
name = "User Execution"
reference = "https://attack.mitre.org/techniques/T1204/"
[[threat.technique.subtechnique]]
id = "T1204.002"
name = "Malicious File"
reference = "https://attack.mitre.org/techniques/T1204/002/"



[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"

[internal]
min_endpoint_version = "8.10.0"