windows enabled community high v1.0.0

regasm

Part of .NET Located at: C:\Windows\Microsoft.NET\Framework\v2.0.50727\regasm.exe; C:\Windows\Microsoft.NET\Framework64\v2.0.50727\regasm.exe; C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe.

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regasm

regasm

Sandbox: execFile · Timeout: 30s

Capabilities

security.defense-evasion.bypass

security.execution.command

Contract

Outputs

process.output

Command execution output

Side effects: process_spawn

Workflow Edges

Produces

process.output

Resource Profile

Resource	Value
CPU	low
Memory	16 MB
Network	low
Disk I/O	low

Examples

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

regasm.exe {PATH:.dll}

Loads the target .DLL file and executes the UnRegisterClass function. (Execute code and bypass Application whitelisting)

regasm.exe /U {PATH:.dll}

Detection

Type	Rule / 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/bc93e670f5dcb24e96fbe3664d6bcad92df5acad/docs/_stories/suspicious_regsvcs_regasm_activity.md
splunk	https://github.com/splunk/security_content/blob/bee2a4cefa533f286c546cbe6798a0b5dec3e5ef/detections/endpoint/detect_regasm_with_network_connection.yml
ioc	regasm.exe executing dll file

Documentation

regasm

regasm is a Windows LOLBin. Part of .NET Located at: C:\Windows\Microsoft.NET\Framework\v2.0.50727\regasm.exe; C:\Windows\Microsoft.NET\Framework64\v2.0.50727\regasm.exe; C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe.

References

T1218.009.md