Dynasty's 101 Newbie Series | CrackMe #2
| Download CrackMe2_by_Dynasty.zip, 39 kb (password: crackmes.de) Browse contents of CrackMe2_by_Dynasty.zip LVL : 0.5 to 1
Difficulty: 1 - Very easy, for newbies | RatingWaiting for at least 3 votes View profile of Dynasty » |
Solutions
Solution by DrPepUr, published 27. apr, 2008; download (401 kb), password: crackmes.de or browse.
DrPepUr has not rated this crackme yet.
Discussion and comments
| TiGa 20. Apr 2008 | Packed with UPX |
|---|---|
| xylitol 20. Apr 2008 | packed with UPX for a special reason ? |
| Sinok 21. Apr 2008 | UPX unpacking is really easy, you can also use upx -d =.= Anyways I'll give it a try later.. |
| TiGa 21. Apr 2008 | Usually, crackmes packed with UPX are rejected instantly but there is indeed a special reason why it was allowed this time. |
| Dynasty Author 21. Apr 2008 | haha, UPX is known to be a lame packer, I would never use it unless I had a special reason :) Thanks TiGa for allowing it. |
| DrPepUr 21. Apr 2008 | Glad to see you are making good use of the CAST ;-) |
| Knight 21. Apr 2008 | UPX is one of the best packers around, if you claim different you dont know a shit. |
| Dynasty Author 22. Apr 2008 | @ DrPepUr: haha, yeah it comes in handy ;) thanks again, but now that I think about it i coulda just used a XOR right ^^ @ Knight: first, your blatent rudeness is absolutely uncalled for, and i didnt express myself right... I meant "easy to unpack", if it was "lame", it wouldn't be so popular right |
| DrPepUr 22. Apr 2008 | Would have been a lot simpler lol |
| Knight 22. Apr 2008 | Packers and protectors are two different things. UPX is packer with intent to shrink file as much as possible and like i've said it's one of the best ones. Good compression ratio and it's probably the most stable one. What you have in mind is protector, what upx is not. Sorry if i didnt express myself right in the first try. |
| XzzX 22. Apr 2008 | Nice crackme - could be one of mine. ;-) Does the stack start at the same address on every machine and os? btw try to register a short name after a long one ;-) |
| -Lord Virus- 22. Apr 2008 | It's protected in UPX. hack protected. it's not so easy. Can we use a tool to eliminate that protection?. or we have to do it manually.??. |
| Dynasty Author 23. Apr 2008 | @ -Lord Virus- : I don't know what protection you are talking about, you don't need a tool trust me! it IS easy but you might be looking too far ahead, it's already been keygenned by a couple people on my forum ;) I'll just say this: pay attention to details, open your eyes and trace as deeply as possible from the very start :P |
| deskyet 25. Apr 2008 | Can someone give me a hint why it is "crashing" when i try to breakpoint on the generation part? I cant breakpoint.. but without breaking (and pressing RegisterMe!) it is not crashing Jeffrey |
| DrPepUr 25. Apr 2008 | Where are you trying to put a BP? |
| XzzX 26. Apr 2008 | Perhaps it checks if i you set a BP ... |
| Dynasty Author 27. Apr 2008 | yeah... there is a checksum on that part of the code... =) It's not hard to bypass tho, I just wanted to make reversers wonder "what the hell?!" but it can get solved in like one second. @ DrPepUr: Thanks for the solution and for taking an interest ;) |
| Dynasty Author 27. Apr 2008 | BTW DrPepUr, yeah that "thing with wsprintf" was an accident at first, but I figured what the hell, i'll leave it this way and see what ppl think :P Some things don't make sense at all and the code is not all that clean in this crackme, it was coded way too fast and never tested (I've got nasty comments!) ... but it's part of the fun ;) Beautiful tutorial and keygen, as usual man ;) How about ScrewMe #2 now? |
| DrPepUr 27. Apr 2008 | I already solved Screwme #2 but I figured it wasant fair because I helped with the testing......Only thing I had to change on the last keygen I sent you was the keyfile part. I dunno I might write a tutorial, give it a little more time though give others a chance. |
| deibiz_xxl 05. Jul 2008 | UPX is one of the best packers... but packer doesn't imply protector... |
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