Network Connection via Startup Item

[rule]
description = """
Identifies the execution of an unsigned program or script from the Startup shell folder followed by an immediate network
connection. This may indicate the presence of a malicious persistent item.
"""
id = "0b33141a-3f73-4414-ba90-d8410e6ab176"
license = "Elastic License v2"
name = "Network Connection via Startup Item"
os_list = ["windows"]
version = "1.0.31"

query = '''
sequence by process.entity_id with maxspan=1m
 [process where event.action == "start" and
  (
   // unsigned program starting from startup folder
   (process.executable : (
    "?:\\Users\\*\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\*",
    "?:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\*")  and
    not process.code_signature.trusted == true) or

    // Scripts starting from startup folder
   (process.name : ("cscript.exe", "wscript.exe", "mshta.exe", "powershell.exe") and
    process.command_line : (
        "*:\\Users\\*\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\*",
        "*:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\*"))
  ) and

  /* ConnectWiseManage - unsigned */
  not process.hash.sha256 : "cac904da410372bcd0797b4bfa402c8f8663040f26e80a435d98d12bd2fa6659"]
 [network where 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", "192.168.0.0/16", "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 = "7.15.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 1

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"
[[threat.technique.subtechnique]]
id = "T1059.001"
name = "PowerShell"
reference = "https://attack.mitre.org/techniques/T1059/001/"

[[threat.technique.subtechnique]]
id = "T1059.005"
name = "Visual Basic"
reference = "https://attack.mitre.org/techniques/T1059/005/"

[[threat.technique.subtechnique]]
id = "T1059.007"
name = "JavaScript"
reference = "https://attack.mitre.org/techniques/T1059/007/"



[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1547"
name = "Boot or Logon Autostart Execution"
reference = "https://attack.mitre.org/techniques/T1547/"
[[threat.technique.subtechnique]]
id = "T1547.001"
name = "Registry Run Keys / Startup Folder"
reference = "https://attack.mitre.org/techniques/T1547/001/"



[threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1218"
name = "System Binary Proxy Execution"
reference = "https://attack.mitre.org/techniques/T1218/"
[[threat.technique.subtechnique]]
id = "T1218.005"
name = "Mshta"
reference = "https://attack.mitre.org/techniques/T1218/005/"



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

[internal]
min_endpoint_version = "7.15.0"