Nasreddine Bencherchali
40 lines
1.4 KiB
YAML
40 lines
1.4 KiB
YAML
title: Suspicious Csi.exe Usage
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id: 40b95d31-1afc-469e-8d34-9a3a667d058e
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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'
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status: experimental
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author: Konstantin Grishchenko, oscd.community
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date: 2020/10/17
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modified: 2022/07/11
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references:
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- https://lolbas-project.github.io/lolbas/OtherMSBinaries/Csi/
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- https://lolbas-project.github.io/lolbas/OtherMSBinaries/Rcsi/
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- https://enigma0x3.net/2016/11/21/bypassing-application-whitelisting-by-using-rcsi-exe/
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- https://twitter.com/Z3Jpa29z/status/1317545798981324801
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tags:
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- attack.execution
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- attack.t1072
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- attack.defense_evasion
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- attack.t1218
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logsource:
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category: process_creation
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product: windows
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detection:
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selection_img:
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- Image|endswith:
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- '\csi.exe'
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- '\rcsi.exe'
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- OriginalFileName:
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- 'csi.exe'
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- 'rcsi.exe'
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selection_cli:
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Company: 'Microsoft Corporation'
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condition: all of selection*
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fields:
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- ComputerName
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- User
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- CommandLine
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- ParentCommandLine
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falsepositives:
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- Legitimate usage by software developers
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level: medium
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