IIS Components - T1505.004

(ATT&CK® Technique)

Definition

Adversaries may install malicious components that run on Internet Information Services (IIS) web servers to establish persistence. IIS provides several mechanisms to extend the functionality of the web servers. For example, Internet Server Application Programming Interface (ISAPI) extensions and filters can be installed to examine and/or modify incoming and outgoing IIS web requests. Extensions and filters are deployed as DLL files that export three functions: Get{Extension/Filter}Version, Http{Extension/Filter}Proc, and (optionally) Terminate{Extension/Filter}. IIS modules may also be installed to extend IIS web servers.

D3FEND Inferred Relationships

Browse the D3FEND knowledge graph by clicking on the nodes below.

        graph LR;

     T1505004["IIS Components"] --> |adds| Software["Software"]; class T1505004 OffensiveTechniqueNode;
        class Software ArtifactNode; click Software href "/dao/artifact/d3f:Software";
        click T1505004 href "/offensive-technique/attack/T1505.004/"; click Software href "/dao/artifact/d3f:Software";             SoftwareUpdate["Software Update"] -->
          | updates | Software["Software"];

          SoftwareUpdate["Software Update"] -.->
            | may-harden | T1505004["IIS Components"] ;
          class SoftwareUpdate DefensiveTechniqueNode;
          class Software ArtifactNode;
          click SoftwareUpdate href "/technique/d3f:SoftwareUpdate";   RestoreSoftware["Restore Software"] -->
          | restores | Software["Software"];

          RestoreSoftware["Restore Software"] -.->
            | may-restore | T1505004["IIS Components"] ;
          class RestoreSoftware DefensiveTechniqueNode;
          class Software ArtifactNode;
          click RestoreSoftware href "/technique/d3f:RestoreSoftware";

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