vbc.exe

Binary file used for compile vbs code

Paths

• C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
• C:\Windows\Microsoft.NET\Framework\v3.5\vbc.exe
• C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
• C:\Windows\Microsoft.NET\Framework64\v4.0.30319\vbc.exe
• C:\Windows\Microsoft.NET\Framework64\v3.5\vbc.exe
• C:\Windows\Microsoft.NET\Framework64\v2.0.50727\vbc.exe

Commands

Compile

Binary file used by .NET to compile Visual Basic code to an executable.

Use case: Compile attacker code on system. Bypass defensive counter measures.

Privileges: User

vbc.exe /target:exe {PATH_ABSOLUTE:.vb}

Compile

Binary file used by .NET to compile Visual Basic code to an executable.

Use case: Compile attacker code on system. Bypass defensive counter measures.

Privileges: User

vbc -reference:Microsoft.VisualBasic.dll {PATH_ABSOLUTE:.vb}

Detection

• Sigma: https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_lolbin_visual_basic_compiler.yml
• Elastic: https://github.com/elastic/detection-rules/blob/61afb1c1c0c3f50637b1bb194f3e6fb09f476e50/rules/windows/defense_evasion_dotnet_compiler_parent_process.toml