Adversaries may use MSBuild to proxy execution of code through a trusted Windows utility. MSBuild.exe (Microsoft Build Engine) is a software build platform used by Visual Studio. It handles XML formatted project files that define requirements for loading and building various platforms and configurations.(Citation: MSDN MSBuild) Adversaries can abuse MSBuild to proxy execution of malicious code. The inline task capability of MSBuild that was introduced in .NET version 4 allows for C# or Visual Basic code to be inserted into an XML project file.(Citation: MSDN MSBuild)(Citation: Microsoft MSBuild Inline Tasks 2017) MSBuild will compile and execute the inline task. MSBuild.exe is a signed Microsoft binary, so when it is used this way it can execute arbitrary code and bypass application control defenses that are configured to allow MSBuild.exe execution.(Citation: LOLBAS Msbuild)
Executes the code in a project file using msbuild.exe. The default C# project example file (T1127.001.csproj) will simply print “Hello From a Code Fragment” and “Hello From a Class.” to the screen.
Supported Platforms: Windows
auto_generated_guid: 58742c0f-cb01-44cd-a60b-fb26e8871c93
| Name | Description | Type | Default Value | |——|————-|——|—————| | filename | Location of the project file | path | PathToAtomicsFolder\T1127.001\src\T1127.001.csproj| | msbuildpath | Default location of MSBuild | path | C:\Windows\Microsoft.NET\Framework\v4.0.30319| | msbuildname | Default name of MSBuild | path | msbuild.exe|
1
command_prompt
#{msbuildpath}\#{msbuildname} "#{filename}"
1
powershell
1
if (Test-Path "#{filename}") {exit 0} else {exit 1}
1
2
New-Item -Type Directory (split-path "#{filename}") -ErrorAction ignore | Out-Null
Invoke-WebRequest "https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1127.001/src/T1127.001.csproj" -OutFile "#{filename}"
Executes the code in a project file using msbuild.exe. The default Visual Basic example file (vb.xml) will simply print “Hello from a Visual Basic inline task!” to the screen.
Supported Platforms: Windows
auto_generated_guid: ab042179-c0c5-402f-9bc8-42741f5ce359
| Name | Description | Type | Default Value | |——|————-|——|—————| | filename | Location of the project file | path | PathToAtomicsFolder\T1127.001\src\vb.xml| | msbuildpath | Default location of MSBuild | path | C:\Windows\Microsoft.NET\Framework\v4.0.30319| | msbuildname | Default name of MSBuild | path | msbuild.exe|
1
command_prompt
#{msbuildpath}\#{msbuildname} "#{filename}"
1
powershell
1
if (Test-Path "#{filename}") {exit 0} else {exit 1}
1
2
New-Item -Type Directory (split-path "#{filename}") -ErrorAction ignore | Out-Null
Invoke-WebRequest "https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1127.001/src/vb.xml" -OutFile "#{filename}"