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General Security Discussions
Microsoft Best Security Practices
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<blockquote data-quote="mazskolnieces" data-source="post: 922954" data-attributes="member: 88422"><p>The OP in that thread asked about policies to prevent AppLocker bypasses. At the top of the list are rundll32 and regsvr32AppLocker bypasses. Microsoft knows about this aspect of AppLocker. So if you ask Microsoft Security, then they're going to point you to the LOLBin, MITRE and other online security resources that give the only way to prevent those AppLocker bypasses - and that is to disable both rundll32 and regsvr32 permanently. Disabling both are a security best practice. If a user wants to assume the risk, then they don't have to disable them. Microsoft has always promoted this strategy of best security practices.</p><p></p><p>Both rundll32 and regsvr32 are not needed by either Windows for workstation nor server to function properly. Nor do any programs require them to function. Literally millions of enterprise endpoints and servers have both permanently disabled with no ill effects.</p><p></p><p>A user does not need full-time access to Control Panel via rundll32. Given that the average user goes into Control Panel very little, disabling access is not any kind of inconvenience. A user can turn off protections with a single click, go into Control Panel, do what they need to do, and then re-enable protections. Microsoft clients have been doing this for the past 20 or years.</p></blockquote><p></p>
[QUOTE="mazskolnieces, post: 922954, member: 88422"] The OP in that thread asked about policies to prevent AppLocker bypasses. At the top of the list are rundll32 and regsvr32AppLocker bypasses. Microsoft knows about this aspect of AppLocker. So if you ask Microsoft Security, then they're going to point you to the LOLBin, MITRE and other online security resources that give the only way to prevent those AppLocker bypasses - and that is to disable both rundll32 and regsvr32 permanently. Disabling both are a security best practice. If a user wants to assume the risk, then they don't have to disable them. Microsoft has always promoted this strategy of best security practices. Both rundll32 and regsvr32 are not needed by either Windows for workstation nor server to function properly. Nor do any programs require them to function. Literally millions of enterprise endpoints and servers have both permanently disabled with no ill effects. A user does not need full-time access to Control Panel via rundll32. Given that the average user goes into Control Panel very little, disabling access is not any kind of inconvenience. A user can turn off protections with a single click, go into Control Panel, do what they need to do, and then re-enable protections. Microsoft clients have been doing this for the past 20 or years. [/QUOTE]
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