Phoenix Studio
Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
3,707
Ready to search
Backends
17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
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Active Rule
Suspicious Csi.exe Usage
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Suspicious Csi.exe Usage
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: Suspicious Csi.exe Usage
id: 40b95d31-1afc-469e-8d34-9a3a667d058e
status: test
description: Csi.exe is a signed binary from Microsoft that comes with Visual Studio and provides C# interactive capabilities. It can be used to run C# code from a file passed as a parameter in command line. Early version of this utility provided with Microsoft “Roslyn” Community Technology Preview was named 'rcsi.exe'
references:
- https://lolbas-project.github.io/lolbas/OtherMSBinaries/Csi/
- https://lolbas-project.github.io/lolbas/OtherMSBinaries/Rcsi/
- https://enigma0x3.net/2016/11/21/bypassing-application-whitelisting-by-using-rcsi-exe/
- https://twitter.com/Z3Jpa29z/status/1317545798981324801
author: Konstantin Grishchenko, oscd.community
date: 2020-10-17
modified: 2022-07-11
tags:
- attack.lateral-movement
- attack.execution
- attack.t1072
- attack.defense-evasion
- attack.t1218
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith:
- '\csi.exe'
- '\rcsi.exe'
- OriginalFileName:
- 'csi.exe'
- 'rcsi.exe'
selection_cli:
Company: 'Microsoft Corporation'
condition: all of selection*
falsepositives:
- Legitimate usage by software developers
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_csi_execution.yml