Elastic Defend high stable eql

VSS Service Disabled Followed by a Suspicious File Rename

Identifies changes of the Volume Shadow Service start type to disabled status and subsequently followed by a suspicious file rename operation. This may indicate Ransomware behavior.

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Detection Logic

sequence with maxspan=1m
 [registry where registry.path : "HKLM\\SYSTEM\\ControlSet*\\Services\\VSS\\Start" and registry.data.strings : "4"]
 [file where event.action : "rename" and
  file.extension != null and file.Ext.entropy >= 7 and
  file.Ext.original.name : ("*.jpg", "*.bmp", "*.png", "*.pdf", "*.doc", "*.docx", "*.xls", "*.xlsx", "*.ppt", "*.pptx") and
  not file.extension : ("tmp", "~tmp", "diff", "gz", "download", "bak", "bck", "lnk", "part", "save", "url", "jpg",
                        "bmp", "png", "pdf", "doc", "docx", "xls", "xlsx", "ppt", "pptx")]

Field Validations

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