Fully qualified class name: org.signserver.module.ooxmlsigner.OOXMLSigner
OOXML Signer, which stands for Office Open XML Signer is a plug-in to SignServer that applies server side signature to documents in OOXML format. It has been tested with MS Office 2007.
Currently OOXML Signer supports only "invisible" signatures , that is unlike PDF signer there's no pictorial representation of the digital signature.
When you open signed document in MS Office you can verify signature using toolbars, or the notifier in status bar (red mark), which notifies user that the document is digitally signed.
Other than standard worker properties, OOXML Signer does not have any other custom OOXML signer specific properties.