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Full Reverse (Disassembly) of a infection decrypter app that uses custom XOR, and cracking on the custom XOR.

There is an infection that encrypts peoples files, and when you pay them you get a decrypter than decrypts them. I have disassembled this to the point to where i have the function that decrypts in C# now, and even made a flow diagram of how the encryption works. But i need someone to be able to disassemble it more, to get enough information, and then crack the custom encryption. I know its crackable, as it is XOR. But they customized it to use it in a CFB kind of way. If you know CryptoGraphy, and assembly, Please contact me.

Also, the Decrypter exe is highly obfuscated with a custom obfusctor. So it does take time to figure out which functions are junk and which are real.

Færdigheder: .NET, Montage, C programmering, Kryptografi, x86-x64 Assembler

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Om arbejdsgiveren:
( 3 bedømmelser ) coral springs, United States

Projekt-ID: #5981565

Tildelt til:

GreenPanda

Hi, My name is Mohamed Shetta. I have an experience in reverse code engineering. I do malware research, vulnerability research and reversing for the purpose of decompilation. I have already found vulnerabilities i Mere

$333 USD in 5 dage
(0 bedømmelser)
0.0

8 freelancere byder i gennemsnit $466 for dette job

vietitdotinfo

Hi. I have exp in encryption/decryption/reverse. I have done alot of similar projects. I am ready to do for you. Thanks!

$1500 USD in 5 dage
(52 bedømmelser)
6.2
dragomirvw

Hello, I have experience with debugging similar malware programs. However, I think that this is a very difficult job and that is why my bid is higher than the budget you have specified. Please, contact me if you wan Mere

$750 USD in 30 dage
(73 bedømmelser)
4.9
ysc2011

Can i have the full software if you had it send me full package and detail please .

$250 USD in 10 dage
(4 bedømmelser)
3.4
MuradMurad

Hi, I recently worked on a project identifying an encryption algorithm and can help you with this task. In what language is the virus written?

$277 USD in 7 dage
(2 bedømmelser)
2.9
shizong

I have read your requirement. I have 3 years programming experiences. I already have skills like your project. If you choose me, I will not let you down. I will wait for your reply

$400 USD in 5 dage
(4 bedømmelser)
2.4
BestDev007

hi, i can do your ptoject, please send app file to analyzing....i will change my bid after it (maybe)...............................................................

$350 USD in 2 dage
(3 bedømmelser)
2.4
swifthorse

Hello, sir. I read your job posting with interest. I am very interested in your job. I am a excellent reverse engineer and have rich experiences. I can use many debugging tools like IDA pro and SoftICE. I have mo Mere

$388 USD in 3 dage
(2 bedømmelser)
1.5
zaincheck

Dear, I can do this project for you. I did MS in Information Security and an Electronics Engineer. I will disassemble and can fix this bug.I already did this type of project and cracked M209 machine.

$155 USD in 13 dage
(0 bedømmelser)
0.0
waseemaslam85

Dear brother, I can do this for you.I am basically a cryptographer and can crack this algorithm. I work with full dedication and result oriented effort. If you need further information let me know.

$111 USD in 7 dage
(0 bedømmelser)
0.0