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Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
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Backends
17
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pySigma Versions
10
Newest: 1.3.3
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Active Rule
Potential Powershell ReverseShell Connection
Target Profile
Splunk
Splunk through pysigma-backend-splunk.
Format Mode
Default
Default pySigma output mode for this backend.
Conversion Output
Potential Powershell ReverseShell Connection
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: Potential Powershell ReverseShell Connection
id: edc2f8ae-2412-4dfd-b9d5-0c57727e70be
status: stable
description: Detects usage of the "TcpClient" class. Which can be abused to establish remote connections and reverse-shells. As seen used by the Nishang "Invoke-PowerShellTcpOneLine" reverse shell and other.
references:
- https://www.volexity.com/blog/2021/03/02/active-exploitation-of-microsoft-exchange-zero-day-vulnerabilities/
- https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
- https://github.com/samratashok/nishang/blob/414ee1104526d7057f9adaeee196d91ae447283e/Shells/Invoke-PowerShellTcpOneLine.ps1
author: FPT.EagleEye, wagga, Nasreddine Bencherchali (Nextron Systems)
date: 2021-03-03
modified: 2023-04-05
tags:
- attack.execution
- attack.t1059.001
logsource:
category: process_creation
product: windows
detection:
selection_img:
- OriginalFileName:
- 'PowerShell.EXE'
- 'pwsh.dll'
- Image|endswith:
- '\powershell.exe'
- '\pwsh.exe'
selection_cli:
CommandLine|contains|all:
- ' Net.Sockets.TCPClient'
- '.GetStream('
- '.Write('
condition: all of selection_*
falsepositives:
- In rare administrative cases, this function might be used to check network connectivity
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_reverse_shell_connection.yml