A security researcher has released a proof-of-concept tool named GhostLock that demonstrates how a legitimate Windows file API can be abused in attacks to block access to files stored locally or on SMB network shares. [...]
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source https://www.bleepingcomputer.com/news/security/new-ghostlock-tool-abuses-windows-api-to-block-file-access/
source https://www.bleepingcomputer.com/news/security/new-ghostlock-tool-abuses-windows-api-to-block-file-access/