Filter based on parent-child relationship, file paths, endpoint or user. Typically seen used to encode files, but it is possible to see legitimate use of decode. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the Endpoint datamodel in the Processes node. List of fields required to use this analytic. It allows the user to filter out any results (false positives) without editing the SPL. | tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where `process_certutil` Processes.process=*decode* by st er Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_idĬertutil_with_decode_argument_filter is a empty macro by default. Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud.Review its contents or execution behavior for further analysis. During triage, identify the source of the file being decoded. Similarly, the file will be encoded in HEX and later decoded for further execution. Note that there are two additional command switches that may be used - encodehex and decodehex. Once decoded, it will be loaded by a parallel process. Malicious usage will include decoding a encoded file that was downloaded. Encoding will convert a file to base64 with -BEGIN CERTIFICATE- and -END CERTIFICATE- tags. CertUtil.exe may be used to encode and decode a file, including PE and script code.
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