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Why do some antiviruses hook x64 Ntdll in WOW64 process?

Why do some antiviruses hook x64 Ntdll in WOW64 process? However, the same antiviruses do not hook Ntdll in the native x64 processes.
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Why does dup2(2) function has no effect here?

I am trying to solve The Protostar Net One task. When I open the net1 binary with strace -f ./net1 I get this result. In which the program clones itself, kills the parent, and dups all standard file ...
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