The security research team at Rhino Labs, a US-based cyber-security company, has discovered that malicious actors can use a lesser-known Microsoft Word feature called subDoc to trick Windows computers into handing over their NTLM hashes, the standard format in which user account credentials are stored.
Microsoft has patched only recent versions Windows against a dangerous hack that could allow attackers to steal Windows NTLM password hashes without any user interaction.
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Microsoft's July 2017 Patch Tuesday includes a fix for an issue with the NT LAN Manager (NTLM) Authentication Protocol that can be exploited to allow attackers to create admin accounts on a local network's domain controller (DC).