Suspicious Csi.exe Usage
testmediumLog-Quelle: windows · process_creationAutor Konstantin Grishchenko, oscd.communityDatum 2020-10-17
01
Beschreibung
Was dies ist, in Kürze.
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'
02
Tags
attack.lateral-movementattack.executionattack.stealthattack.t1072attack.t1218
03
Regelquelle (YAML)
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.stealth
- attack.t1072
- 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
04
erkennt Techniken (2)
ATT&CK-Techniken, die dies ermöglicht oder abbildet.
05
Referenzen
Externe Belege — Patches, Meldungen, Analysen.