Detection rules › Splunk
Logon Script Registry Key added (Sysmon)
Adversaries may use Windows logon scripts automatically executed at logon initialization to establish persistence.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1037.001 Boot or Logon Initialization Scripts: Logon Script (Windows) |
| Privilege Escalation | T1037.001 Boot or Logon Initialization Scripts: Logon Script (Windows) |
References
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Sysmon | Event ID 12 | RegistryEvent (Object create and delete) |
| Sysmon | Event ID 13 | RegistryEvent (Value Set) |
Rule body yaml
id: '5998.18216'
title: Logon Script Registry Key added
description: 'Adversaries may use Windows logon scripts automatically executed at
logon initialization to establish persistence. '
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_sysmon` (("EventCode=12" OR "<EventID>12<"
OR "EventCode=13" OR "<EventID>13<") OR ("EventCode=1" OR "<EventID>1<" OR (TERM(reg)
OR "reg.exe"))) "UserInitMprLogonScript" | table _time, host, user process, process_*,
singature_id, parent_* | bin span=1s | stats values(*) as * by _time, host '
techniques:
- persistence:boot or logon initialization scripts:logon script (windows)
- privilege-escalation:boot or logon initialization scripts:logon script (windows)
technique_id:
- T1037.001
data_category:
- Windows Sysmon
references:
- https://blog.morphisec.com/cobalt-gang-2.0
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_sysmon` (("EventCode=12" OR "<EventID>12<" OR "EventCode=13" OR "<EventID>13<") OR ("EventCode=1" OR "<EventID>1<" OR (TERM(reg) OR "reg.exe"))) "UserInitMprLogonScript"
Stage 2: table
| table _time, host, user process, process_*, singature_id, parent_*
Stage 3: bucket
| bin span=1s
Stage 4: stats
| stats values(*) as * by _time, host
Search terms
Bare-string tokens in the SPL search body. Splunk matches each token against _raw (the untyped raw event text) anywhere it appears, not against a specific field. These don't surface in the Indicators table because they aren't predicates on a known field.
| Stage | Term |
|---|---|
| 1 | "EventCode=12" |
| 1 | "<EventID>12<" |
| 1 | "EventCode=13" |
| 1 | "<EventID>13<" |
| 1 | "EventCode=1" |
| 1 | "<EventID>1<" |
| 1 | TERM |
| 1 | reg |
| 1 | "reg.exe" |
| 1 | "UserInitMprLogonScript" |