Detection rules › Sigma
Enabling COR Profiler Environment Variables
Detects .NET Framework CLR and .NET Core CLR "cor_enable_profiling" and "cor_profiler" variables being set and configured.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | |
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 13: RegistryEvent (Value Set) |
Rule body
title: Enabling COR Profiler Environment Variables
id: ad89044a-8f49-4673-9a55-cbd88a1b374f
status: test
description: Detects .NET Framework CLR and .NET Core CLR "cor_enable_profiling" and "cor_profiler" variables being set and configured.
references:
- https://twitter.com/jamieantisocial/status/1304520651248668673
- https://www.slideshare.net/JamieWilliams130/started-from-the-bottom-exploiting-data-sources-to-uncover-attck-behaviors
- https://www.sans.org/cyber-security-summit/archives
- https://learn.microsoft.com/en-us/dotnet/core/runtime-config/debugging-profiling
author: Jose Rodriguez (@Cyb3rPandaH), OTR (Open Threat Research), Jimmy Bayne (@bohops)
date: 2020-09-10
modified: 2023-11-24
tags:
- attack.persistence
- attack.privilege-escalation
- attack.execution
- attack.stealth
- attack.t1574.012
logsource:
category: registry_set
product: windows
detection:
selection_1:
TargetObject|endswith:
- '\COR_ENABLE_PROFILING'
- '\COR_PROFILER'
- '\CORECLR_ENABLE_PROFILING'
selection_2:
TargetObject|contains: '\CORECLR_PROFILER_PATH'
condition: 1 of selection_*
level: medium
Stages and Predicates
Stage 0: condition
1 of selection_*Stage 1: selection_1
selection_1:
TargetObject|endswith:
- '\COR_ENABLE_PROFILING'
- '\COR_PROFILER'
- '\CORECLR_ENABLE_PROFILING'
Stage 2: selection_2
selection_2:
TargetObject|contains: '\CORECLR_PROFILER_PATH'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
TargetObject | ends_with |
| field:"TargetObject" kind:ends_with |
TargetObject | match |
| field:"TargetObject" kind:match value:"\CORECLR_PROFILER_PATH" |