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How do Software Restriction Policies work (part 2) ?
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<blockquote data-quote="Andy Ful" data-source="post: 611840" data-attributes="member: 32260"><p>Finally, I tested 16 Bit COM, EXE files (in Vista Ultimate). SRP can block them as in the case of 32Bits, even when COM, EXE extensions are removed from 'Designated File Types' list . But, there is a strange behavior of ntvdm.exe - it can be partially blocked by SRP, so cannot be run from Explorer or from Command Prompt. Yet, when whitelisted EXE(COM) file has been executed, then ntvdm.exe proces is created, anyway. The system can run ntvdm.exe indirectly (with medium integrity level), bypassing SRP. I found out, that NTVDM subsystem can still be disrupted by SRP, when blocking ntvdmd.dll library - ntvdm.exe is started, but COM, EXE file is not executed.</p></blockquote><p></p>
[QUOTE="Andy Ful, post: 611840, member: 32260"] Finally, I tested 16 Bit COM, EXE files (in Vista Ultimate). SRP can block them as in the case of 32Bits, even when COM, EXE extensions are removed from 'Designated File Types' list . But, there is a strange behavior of ntvdm.exe - it can be partially blocked by SRP, so cannot be run from Explorer or from Command Prompt. Yet, when whitelisted EXE(COM) file has been executed, then ntvdm.exe proces is created, anyway. The system can run ntvdm.exe indirectly (with medium integrity level), bypassing SRP. I found out, that NTVDM subsystem can still be disrupted by SRP, when blocking ntvdmd.dll library - ntvdm.exe is started, but COM, EXE file is not executed. [/QUOTE]
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