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nullbyte

Cum sa spargi o aplicatie - simplu [non lame]

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Target: 4U WMA MP3 Converter

Link: http://www.wma-mp3-converter.net/files/4UWMAMP3Converter.exe

Rules: Fara patching; user si key la vedere...

DEFINITII:

olly = Olly Debugger [http://www.ollydbg.de/odbg110.zip]

4u = 4U WMA MP3 Converter

Hai sa trecem la treaba!

Dezarhivati olly undeva si faceti un shortcut pe Desktop.

Instalati 4u.

Tarati iconita 4u peste iconita olly de pe Desktop... Bun... Ce vedeti acum e codul asm [http://en.wikipedia.org/wiki/Assembly_language]

53760127ui2.th.png

Rulati separat odata programul, duceti-va la: Help > Register si bagati info false... Tineti minte textul erorii primite.

Inchideti 4u.

Acum reveniti la olly, click dreapta, Search for > All referenced text strings.

In noua fereastra, click dreapta, Search for text.

Bun, debifati Case Sensitive si bifati Entire scope.

Scrie-ti putin text din eroarea primita... Eu voi scrie: invalid

Apasati CTRL+L pana cand gasiti eroarea exact ca in program. Dublu click pe ea!

13261151ur5.th.png

In noua fereastra, veti vedea:

oollylr4.th.png

Dupa cum vedeti, inainte de Title... Este:


CALL 00404B90

Acel cod face apel la un keygenerator intern al programului aflat la adresa 00404B90.

Dublu click pe E8 3E02F7FF pentru a seta in breakpoint; se va face rosu ca in poza de mai sus.

Ce am facut? Atunci cand bagam date gresite, nu ne mai arata eroarea, ci ne genereaza un serial.

Apasam F9 pentru a rula aplicatia modificata...

Help > Register .. scrieti ce user doriti... si apasa-ti OK... Reveniti la olly si uitati-va in dreapta jos. Dati scroll pana gasiti un text de genul:

ASCII "XXXXX-XXXXX-XXXXX"

Aceea e cheia dvs. Inchide-ti olly si folositi-o :)

licenseiy0.th.png

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aceasta metoda nu merge chiar la toate softurile.Fiecare firma care produce softuri incearca sa gaseasca algoritmi pe care un simplu cracker sa nu le descluseasca .Cu ollydbg + alte softuri ajutatoare puteti crackui(adik sa aflati parola etc)la programe dar prin alte metode.Nu e una la toate!

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