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regsvcs

Regsvcs and Regasm are Windows command-line utilities that are used to register .NET Component Object Model (COM) assemblies Located at: C:\Windows\Microsoft.NET\Framework64\v2.0.50727\RegSvcs.exe; C:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegSvcs.exe; C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe.

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regsvcs
regsvcs

Sandbox: execFile · Timeout: 30s

Capabilities

security.execution.command
security.defense-evasion.bypass

Contract

Outputs

process.output

Command execution output

Side effects: process_spawn

Workflow Edges

Produces

process.output

Resource Profile

ResourceValue
CPUlow
Memory16 MB
Networklow
Disk I/Olow

Examples

Loads the target .NET DLL file and executes the RegisterClass function. (Execute dll file and bypass Application whitelisting)

regsvcs.exe {PATH:.dll}

Loads the target .NET DLL file and executes the RegisterClass function. (Execute dll file and bypass Application whitelisting)

regsvcs.exe {PATH:.dll}

Detection

TypeRule / Indicator
sigma https://github.com/SigmaHQ/sigma/blob/6312dd1d44d309608552105c334948f793e89f48/rules/windows/process_creation/proc_creation_win_lolbin_regasm.yml
elastic https://github.com/elastic/detection-rules/blob/12577f7380f324fcee06dab3218582f4a11833e7/rules/windows/execution_register_server_program_connecting_to_the_internet.toml
splunk https://github.com/splunk/security_content/blob/bee2a4cefa533f286c546cbe6798a0b5dec3e5ef/detections/endpoint/detect_regsvcs_with_network_connection.yml

Documentation

regsvcs

regsvcs is a Windows LOLBin. Regsvcs and Regasm are Windows command-line utilities that are used to register .NET Component Object Model (COM) assemblies Located at: C:\Windows\Microsoft.NET\Framework64\v2.0.50727\RegSvcs.exe; C:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegSvcs.exe; C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe.

References