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Signed Script Proxy Execution
Adversaries may use scripts signed with trusted certificates to proxy execution of malicious files. Several Microsoft signed scripts that are default on Windows installations can be used to proxy execution of other files. This behavior may be abused by adversaries to execute malicious files that could bypass application control and signature validation on systems.[1]
Mitigations
Mitigation | Description |
---|---|
Execution Prevention |
Certain signed scripts that can be used to execute other programs may not be necessary within a given environment. Use application control configured to block execution of these scripts if they are not required for a given system or network to prevent potential misuse by adversaries. |
Detection
Monitor script processes, such as cscript
, and command-line parameters for scripts like PubPrn.vbs that may be used to proxy execution of malicious files.