{
  "type": "attack-pattern",
  "spec_version": "2.1",
  "id": "attack-pattern--215190a9-9f02-4e83-bb5f-e0589965a302",
  "created": "2017-05-31T21:31:33.499Z",
  "created_by_ref": "identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5",
  "revoked": true,
  "external_references": [
    {
      "source_name": "mitre-attack",
      "url": "https://attack.mitre.org/techniques/T1121",
      "external_id": "T1121"
    },
    {
      "source_name": "MSDN Regsvcs",
      "description": "Microsoft. (n.d.). Regsvcs.exe (.NET Services Installation Tool). Retrieved July 1, 2016.",
      "url": "https://msdn.microsoft.com/en-us/library/04za0hca.aspx"
    },
    {
      "source_name": "MSDN Regasm",
      "description": "Microsoft. (n.d.). Regasm.exe (Assembly Registration Tool). Retrieved July 1, 2016.",
      "url": "https://msdn.microsoft.com/en-us/library/tzat5yw6.aspx"
    },
    {
      "source_name": "LOLBAS Regsvcs",
      "description": "LOLBAS. (n.d.). Regsvcs.exe. Retrieved July 31, 2019.",
      "url": "https://lolbas-project.github.io/lolbas/Binaries/Regsvcs/"
    },
    {
      "source_name": "LOLBAS Regasm",
      "description": "LOLBAS. (n.d.). Regasm.exe. Retrieved July 31, 2019.",
      "url": "https://lolbas-project.github.io/lolbas/Binaries/Regasm/"
    }
  ],
  "object_marking_refs": [
    "marking-definition--fa42a846-8d90-4e51-bc29-71d5b4802168"
  ],
  "modified": "2026-04-14T22:53:15.915Z",
  "name": "Regsvcs/Regasm",
  "description": "Regsvcs and Regasm are Windows command-line utilities that are used to register .NET Component Object Model (COM) assemblies. Both are digitally signed by Microsoft. (Citation: MSDN Regsvcs) (Citation: MSDN Regasm)\n\nAdversaries can use Regsvcs and Regasm to proxy execution of code through a trusted Windows utility. Both utilities may be used to bypass process whitelisting through use of attributes within the binary to specify code that should be run before registration or unregistration: <code>[ComRegisterFunction]</code> or <code>[ComUnregisterFunction]</code> respectively. The code with the registration and unregistration attributes will be executed even if the process is run under insufficient privileges and fails to execute. (Citation: LOLBAS Regsvcs)(Citation: LOLBAS Regasm)",
  "kill_chain_phases": [
    {
      "kill_chain_name": "mitre-attack",
      "phase_name": "stealth"
    },
    {
      "kill_chain_name": "mitre-attack",
      "phase_name": "execution"
    }
  ],
  "x_mitre_attack_spec_version": "3.2.0",
  "x_mitre_contributors": [
    "Casey Smith"
  ],
  "x_mitre_deprecated": false,
  "x_mitre_domains": [
    "enterprise-attack"
  ],
  "x_mitre_is_subtechnique": false,
  "x_mitre_modified_by_ref": "identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5",
  "x_mitre_platforms": [
    "Windows"
  ],
  "x_mitre_version": "1.3"
}