Detection rules › Splunk
Dotnet.exe Execution (Windows Event Log)
dotnet.exe comes with .NET Framework, is trusted binary and Default AppLocker rule does not block it so it will execute any dll even if applocker is enabled
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1218 System Binary Proxy Execution |
References
Event coverage
| Provider | Event | Title |
|---|---|---|
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
id: '6582.7595'
title: Dotnet.exe Execution
description: dotnet.exe comes with .NET Framework, is trusted binary and Default AppLocker
rule does not block it so it will execute any dll even if applocker is enabled.
Living Off the Land Binary and Scripts (LOLBAS) (LOLBIN)
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR
"<EventID>4688<") ("dotnet") | table _time, host, user user, process, process_*,
parent_* | bin span=1s | stats values(*) as * by _time, host '
techniques:
- defense-evasion:system binary proxy execution
technique_id:
- T1218
data_category:
- Windows event logs
references:
- https://bohops.com/2019/08/19/dotnet-core-a-vector-for-awl-bypass-defense-evasion/
- https://lolbas-project.github.io/lolbas/OtherMSBinaries/Dotnet/
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR "<EventID>4688<") ("dotnet")
Stage 2: table
| table _time, host, user user, process, process_*, parent_*
Stage 3: bucket
| bin span=1s
Stage 4: stats
| stats values(*) as * by _time, host
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 |
|
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 | TERM |
| 1 | "<EventID>4688<" |
| 1 | "dotnet" |