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Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
3,707
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Backends
17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
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Active Rule
Potential AMSI Bypass Via .NET Reflection
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Potential AMSI Bypass Via .NET Reflection
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Potential AMSI Bypass Via .NET Reflection
id: 30edb182-aa75-42c0-b0a9-e998bb29067c
related:
- id: 4f927692-68b5-4267-871b-073c45f4f6fe
type: obsolete
status: test
description: Detects Request to "amsiInitFailed" that can be used to disable AMSI Scanning
references:
- https://s3cur3th1ssh1t.github.io/Bypass_AMSI_by_manual_modification/
- https://www.mdsec.co.uk/2018/06/exploring-powershell-amsi-and-logging-evasion/
author: Markus Neis, @Kostastsale
date: 2018-08-17
modified: 2023-02-03
tags:
- attack.defense-evasion
- attack.t1562.001
logsource:
category: process_creation
product: windows
detection:
selection:
- CommandLine|contains|all:
- 'System.Management.Automation.AmsiUtils'
- 'amsiInitFailed'
- CommandLine|contains|all:
- '[Ref].Assembly.GetType'
- 'SetValue($null,$true)'
- 'NonPublic,Static'
condition: selection
falsepositives:
- Unlikely
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/process_creation/proc_creation_win_powershell_amsi_init_failed_bypass.yml