Detection rules › Splunk
Remote Thread from Suspicious Folder (Sysmon)
Detects potential remote threads created from suspicious file locations like temp, appdata, and downloads
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation | T1055 Process Injection |
| Stealth | T1055 Process Injection |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 8 | CreateRemoteThread |
Rule body yaml
id: '9020.12093'
title: Remote Thread from Suspicious Folder
description: 'Detects potential remote threads created from suspicious file locations
like temp, appdata, and downloads. - Threat Actor Association: APT10/menuPass, TA413
- Software Association: Black Basta, LOWZERO'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_sysmon` (EventCode=8 OR "Event>ID>8<")
("Temporary Internet Files" OR TERM("TEMP") OR TERM("Downloads") OR TERM("Appdata"))
| regex parent_process_path="(?i)Temp|Downloads|Appdata" | table _time, host, user
dest, direction, event_id, eventtype, parent_*, process, process_*, user, user_id
| bin span=1s | stats values(*) as * by _time, host, parent_process_path '
techniques:
- defense-evasion:process injection
- privilege-escalation:process injection
technique_id:
- T1055
data_category:
- Process command-line parameters
- Windows Sysmon
references: null
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_sysmon` (EventCode=8 OR "Event>ID>8<") ("Temporary Internet Files" OR TERM("TEMP") OR TERM("Downloads") OR TERM("Appdata"))
Stage 2: regex
| regex parent_process_path="(?i)Temp|Downloads|Appdata"
Stage 3: table
| table _time, host, user dest, direction, event_id, eventtype, parent_*, process, process_*, user, user_id
Stage 4: bucket
| bin span=1s
Stage 5: stats
| stats values(*) as * by _time, host, parent_process_path
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
EventCode | eq |
|
parent_process_path | regex_match |
|
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 | "Event>ID>8<" |
| 1 | "Temporary Internet Files" |
| 1 | "TEMP" |
| 1 | "Downloads" |
| 1 | "Appdata" |