One way to spot a malicious proxy DLL when there are over 20 DLLs in the folder and one of them is lying, under 60 seconds. Let's go π
1/ An unsigned DLL named like a Microsoft runtime (πππππππ·πΊπΆ.πππ)? Open it in your favorite disassembler. Exports look normal. Now double-click any export, and you see:
πππ πππ‘, ππ:πππππππ
πππ ππ πππ πππ [πππ‘+πΎπΈπΆπ]
Click another one, and it's the same thing. You see 291 exports but zero real code - every function is a forwarding address.
2/ Now check that table: πππππππ in the .ππππ section - it's zeroed on disk. Every export jumps through it, and the file has nothing in it. It stays empty until the DLL loads, then one function does π»ππππ»ππππππ’("πππππππ·πΊπΆπ.πππ") + πΆπππΏππππ°ππππππ a few hundred times.
And there it is: πππππππ·πΊπΆπ.πππ - the legitimate DLL in the same folder with one extra letter in the name. The fake DLL carries the real one's name and forwards every call to it.
The 60-second checklist:
βοΈ DLL named like a Microsoft runtime (πππππππ·πΊπΆ.πππ), but wait, Microsoft didn't sign it
βοΈ all exports share one identical code stub
βοΈ jump table zeroed on disk
βοΈ a second DLL with the same name + one extra letter
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