## GhostLock PoC Weaponizes Windows API to Block Local and SMB File Access
A security researcher has published a proof-of-concept tool called GhostLock that exploits a legitimate Windows application programming interface to deny access to files stored locally or on SMB network shares. The technique raises concerns about how native OS functions can be repurposed into attack vectors without triggering standard security alerts.

GhostLock targets the Windows file API to lock down resources, effectively rendering files inaccessible to legitimate users and processes. According to the researcher's disclosure, the tool operates by leveraging built-in API calls that do not inherently raise suspicion among conventional endpoint detection systems. The ability to target both local storage and SMB shares expands the potential blast radius, particularly in enterprise environments where networked file systems are widely deployed.

The release underscores an ongoing challenge in defensive security: the misuse of trusted system utilities. Unlike traditional malware that relies on suspicious executables or exploit payloads, GhostLock demonstrates that legitimate APIs can be weaponized to achieve disruption with a lower likelihood of detection. Security teams monitoring for behavioral anomalies rather than signature-based indicators may find this technique more difficult to attribute and block in real time. Organizations relying on SMB file sharing should evaluate access controls and monitoring strategies that account for API-level abuse scenarios.
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- **Source**: BleepingComputer Echo RSS
- **Sector**: The Lab
- **Tags**: windows api, file access blocking, smb share, proof-of-concept, endpoint security
- **Credibility**: unverified
- **Published**: 2026-05-12 00:48:22
- **ID**: 82029
- **URL**: https://whisperx.ai/en/intel/82029