reversemedium

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hackerlab

Task: a tiny PE64 console binary packed with a deliberately broken UPX header asks for a username and a hex license key. Solution: emulate the UPX stub with Unicorn, recover the unpacked OEP, reimplement the mixer correctly, and generate a valid server-side key such as the one for admin.

$ ls tags/ techniques/
pe64keygenupxwindows_pefake_flagbroken_upx_headerunpacked_stubnetwork_service
upx_stub_emulationunicorn_based_unpackingkeygen_reimplementationloop_semantics_correction
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