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Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
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17
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CLI Versions
10
Newest: 2.0.2
Translation Workspace
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Active Rule
Potential AMSI Bypass Using NULL Bits
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Potential AMSI Bypass Using NULL Bits
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 Using NULL Bits
id: 92a974db-ab84-457f-9ec0-55db83d7a825
related:
- id: fa2559c8-1197-471d-9cdd-05a0273d4522
type: similar
status: test
description: Detects usage of special strings/null bits in order to potentially bypass AMSI functionalities
references:
- https://github.com/r00t-3xp10it/hacking-material-books/blob/43cb1e1932c16ff1f58b755bc9ab6b096046853f/obfuscation/simple_obfuscation.md#amsi-bypass-using-null-bits-satoshi
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-01-04
modified: 2023-05-09
tags:
- attack.defense-evasion
- attack.t1562.001
logsource:
product: windows
category: process_creation
detection:
selection:
CommandLine|contains:
- "if(0){{{0}}}' -f $(0 -as [char]) +"
- "#<NULL>"
condition: selection
falsepositives:
- Unknown
level: medium
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_null_bits_bypass.yml