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Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
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pySigma Versions
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Newest: 1.3.3
Translation Workspace
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Active Rule
bXOR Operator Usage In PowerShell Command Line - PowerShell Classic
Target Profile
Splunk
Splunk through pysigma-backend-splunk.
Format Mode
Default
Default pySigma output mode for this backend.
Conversion Output
bXOR Operator Usage In PowerShell Command Line - PowerShell Classic
Using Splunk · Default · pySigma 1.3.3
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion1.3.3
title: bXOR Operator Usage In PowerShell Command Line - PowerShell Classic
id: 812837bb-b17f-45e9-8bd0-0ec35d2e3bd6
status: test
description: |
Detects powershell execution with that make use of to the bxor (Bitwise XOR).
Attackers might use as an alternative obfuscation method to Base64 encoded commands.
Investigate the CommandLine and process tree to determine if the activity is malicious.
references:
- https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=46
- https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_arithmetic_operators?view=powershell-5.1
author: Teymur Kheirkhabarov, Harish Segar
date: 2020-06-29
modified: 2024-12-11
tags:
- attack.execution
- attack.t1059.001
- detection.threat-hunting
logsource:
product: windows
category: ps_classic_start
detection:
selection:
Data|contains|all:
- 'HostName=ConsoleHost'
- ' -bxor '
condition: selection
falsepositives:
- Unknown
level: low
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules-threat-hunting/windows/powershell/powershell_classic/posh_pc_bxor_operator_usage.yml