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# pound (Pwnable, 290pts, 20 solves)
In this task, we were given service running `host.py`. It had two functions:- printing some tweets stored as files- compiling a binary using user supplied two macros.
We quickly noticed that we could exploit the first function: giving it`../pound.c` gave us source of compiled binary... |
The task is a usb pcap where two files were transfered. The trick was to takeeach odd packet number and take 0x708 of each to create the first file, use theeven for the 2nd file. We were left with two Libreoffice ods file. In the 2ndone, we found a table and a weird alphabetic suite which used against the tablegive us ... |
## Tonnerre (Crypto, 200 points, 119 solves)
We were pretty sure the service at tonnerre.pwning.xxx:8561 (source) was totally secure. But then we came across this website and now we’re having second thoughts... We think they store the service users in the same database?
###ENG[PL](#pl-version)
This task consisted of... |
We are presented with a login system that simply encrypts a JSON blob under AES-CBC, without performing any integrity checks on the data. As such, it is subject to manipulation. Additionally, we have an encryption oracle in the form of a registration script, allowing us to generate a ciphertext of the following form:{"... |
Hi EveryBody The First Step In Any Forensics Challenges is Checking The File Using file or Strings or hexdump or xxd To Get Some Informations About File This is a Memory Dump so We Can Investigat it Using Volatility Or Any Memory Forensics Framework I've Found A Solution Us... |
Hi EveryBody We Can Check The File Using file or Strings or hexdump or xxd To Get Some Informations About File This is a Memory Dump so We Can Investigat it, I've Found A Solution Using Volatility Forensics Framework With Volatility We Can Extract All Precess And Dll's And Administrator Password .......
./volatilit... |
#What the Hex (crypto, 15) #Solution Decode using hex and see what you get... 6236343a20615735305a584a755a58526659323975646d567963326c76626c3930623239736331397962324e72 We Can Decode This Hex To Strings :
Well, that was really easy. After executing **strings no-big-deal.pcap| egrep ".{10,}" | head** you will get:>NBDMAGICj0 W >=3IHAVEOPTj0 W >=3exportj0 W >Q1RGe2JldHRlcmZzL... |
odrrere=======
* **CTF:** [ASIS CTF Quals 2016](https://asis-ctf.ir/)* **Category:** Forensic* **Points:** 166* **Solves:** 101
> > Chaos is merely order waiting to be deciphered>> José Saramago, The Double
We are given some file. What could it possibly be?
```$ file odrrereodrrere: PNG image data, 665 x 665, 1-bit col... |
# Naive SearchWe first searched for common encodings for the flag header "CTF{" with CapLoader:
Clearly, there was an encoded representation of the flag in the packet capture. Next we determined by elimination that it was Base64 being used, then we sent the reassembled ... |
## Trace (RE, 4p) follow the trace trace.log update: the flag is at 0x400D80 *(uint32_t*)0x00410EA0 == 0x400D80 ###ENG[PL](#pl-version)
We are given very long execution trace (list of opcodes executed by processor, in order) and want to get flag out of it.
It seems funny, because that was really interesting challenge... |
angstromCTF 2016 - <span>Volatile </span>Category:Forensics Score: 90Description:Help! One of our machines has been compromised! We have a memory dump<span>. Find the suspicious process. The machine was running Windows XP service pack 2.</span>The memory dump is WinXPSP2x86 #######Using Volatility Tool :$ ./vol.py -f m... |
#Verticode
Welcome to Verticode, the new method of translating text into vertical codes.
Each verticode has two parts: the color shift and the code.
The code takes the inputted character and translates it into an ASCII code, and then into binary, then puts that into an image in which each black pixel represents a 1 and... |
# Magic Image
For this challenge you were given two files encrypt.py and encrypted.png. Presumably encrypted.png was generated with encrypt.py script. Here are the contents of the encrypt.py.
```python#!/usr/bin/env python
def xor(s1, s2): res = [chr(0)]*12 for i in range(len(res)): q = ord(s1[i]) d... |
if you need some informations or more details: Contact Me : [email protected]GreetZ To: r00tsif you like this video: #Like + #Subscribe + #Share & Thank you ^^ !! |
# Student Grades (Web, 50pts)
We are trying to find out what our grade was, but we don't seem to be in the database...
Can you help us out?
http://104.199.151.39/index.html
## Solution
We can see web application to check some user grades:
When username is entered and 'Check my grades' ... |
#Google-Capture-The-Flag-2016##Ill lntentionsChallenge description: Do you have have ill intentions?
The illintentions.apk was provided.
#Inspecting the provided apkAfter firing up the illintentions.apk in genymotion, we are greeted with an activity displaying: "Select the activity you wish to interact with.To-Do: Add ... |
## hsab (misc, 200)
In this task, we were given only an IP and port to connect to. After sending a simple proof of work,we are immediately dropped into bash shell. Trying a couple of standard commands, such as `ls` or`cat /etc/passwd` doesn't work - it said `ls: command not found`. Playing with it some more time, wenot... |
## Death Sequence (PPC-M) tl;dr use matrixes with fastpow to get the desired results in O(logn) time
In this chall, we're given a series of numbers:
`1 1 1 1 10 46 217 1027 4861 23005 108874 515260 2438533 11540665`
It turns out that each numbers satisfies such formula that: inline equation:
`Fn = F(n-1) * 4 + F(n-2) *... |
��## For1 (Forensics, 100 points)
tl;dr Find mspaint.exe in memory, inspect it as raw data in gimp
We're presented with a Win10x64 memory dump, let's start by inspecting current processes using volatility:
`volatility --profile Win10x64 -f dump1.raw pslist`.
There are 2 particularly interesting lines:
```
Name ... |
To authenticate on a server we had to provide a message signed with a RSA private key. Hopefully the server allows us to sign any message except the one requested with the same key. |
Tokens was a python exploitation challenge during the 2016 Pwn2Win CTF competition held from 25-27 March. When solved the team was awarded 50 points. This challenge focused on being able to identify exploitable python code which would allow the competitor to take advantage of the running service. This challenge explore... |
Angrymin========
* **CTF:** [ASIS CTF Quals 2016](https://asis-ctf.ir/)* **Category:** Misc* **Points:** 52* **Solves:** 19
>> Today, unfortunately I must inform you that I am resigning from my position at you company effective immediately. As each day passed by, it became more clear that you do not care about your cus... |
# Plaid CTF 2016: butterfly
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| Plaid CTF | butterfly | Pwnable | 150 |
### Description> Sometimes [the universe smiles upon you](challenge). And sometimes, well, you just have to roll your sleeves up and do things yours... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
#Untitled-1.pdf
In an appropriate PDF viewer (Chrome's built-in viewer should work), type ⌘-A, ⌘-C, and ⌘-V in some text editor to get the flag: `PCTF{how_2_pdf_yo}`. |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
#Pillpusher - Pwning Problem
##Overview
이문제는 약국을 컨셉으로 하고 있는것 같다.취약점은 매우 간단한데에 비해 stripped,statically linked 되있고 바이너리는 쓸대없이 크고 복잡하다.##Vulnability취약점은 Scrip Menu의 Add Scrip에서 발생하게 된다.Add Scrip에서 Add pill을 할 수 있는데 2개 이상이면 무조건 2개가 되게 되있지만 signed이기 때문에 -1을 넣게 되면 무한정 넣을 수 있다.```cv15 = (signed int)readNum(rbp0, 0);if ( v15 > ... |
#rabit
We are given the source for an implementation of the [Rabin Cryptosystem](https://en.wikipedia.org/wiki/Rabin_cryptosystem). The message and ciphertext space are the quadratic residues modulo N, a product of two [Blum primes](https://en.wikipedia.org/wiki/Blum_integer). Encryption is defined as c = m^2 (mod N), ... |
#edwinchuimport angrSTART_ADDR = 0x00000000004028d9AVOID_ADDR = 0x0000000000402941FIND_ADDR = 0x000000000040293fBASE_ADDR = 0x7fffffffe5c0STACK_ADDR = 0x7fffffffe560INPUT_ADDR = 0x7fffffffe560INPUT_LENGTH = 13p = angr.Project('baby-re')state = p.factory.blank_state(addr=START_ADDR)state.regs.rbp = BASE_ADDRstate.regs.r... |
The Google Capture The Flag 2016 was run on the 2016.04.29 ~ 30 (48h).This is write up about the forensics “For2” which was 200 points.In For2, capture.pcapng was provided but there was any description.Anyway i was given a pcap file.After opening the file in Wireshark, it looked like a USB capture. The majority of the ... |
-------------------------------------------[Eletronics] Eletronic Ballot Box Prototype - 50 points-------------------------------------------
> A member of Project SKY has infiltrated into a Club recycling facility and got access to one of the first prototypes of what became, afterwards, an electronic ballot box (yes, ... |
Our forensics team has analyzed the cell phone of a bank fraud victim. A hacker managed to steal her money with fraudulent bank transfers. Then bank representatives think that the hacker hijacked SMS containing payment tokens, used to verify customer identify prior to sensitive operations. Apparently, the victim bought... |
## quite quixotic quest (Reversing, 300 points, 40 solves)
Well yes, it certainly is quite quixotic. (Yes, the flag format is PCTF{} )
In this task, we had a modified `curl` binary. We were able to notice the main differencewith the original binary even without binary diffing - it was enough to run `qqq --help`to noti... |
## equation (Crypto, 2p)
Here is a RSA private key with its upper part masked. Can your recover the private key and decrypt the file?
###ENG[PL](#pl-version)
We have the picture:
from which we can extract the base64 of the private key part:
```Os9mhOQRdqW2cwVrnNI72DLcAXpXUJ1HGwJBANWiJcDUGxZpnERxVw7s091... |
http://www.repo.kr/2016/05/2016-def-con-ctf-qualifier-reversing.htmlReverse me and get the flag. Get it here.<span>This program is simple, take data as input.</span>Input is checked by function.If input meets the requirements for printing flag, program shows the flag for getting score.<span></span><span>But this binary... |
https://github.com/Blystad/googlectf_writeups/tree/master/networking/opabina_regalis_input_validatio...For this I just re-used all the code from Opabina Regalis Downgrade Attack.<span>I just had to change the URI to point to /protected/token instead of /protected/secret, and it was done.</span> |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
use jsfuck encode js, and urlencodealert(1)=>[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+... |
By attempting to copy and paste the text displayed on the webpage, it is obvious the displayed characters are not the true text of the page. However, upon closer inspection, each displayed character represents a single text character. For example, the actual character '(' is - as a result of the font - displayed as a '... |
Using netcat (or the socket equivalent), go to p.tjctf.org on port 8008 (no longer running) and you can solve a few captchas at a time, unfortunately they require you answer 100 captchas in 30 seconds or less, which indicates you need to automate the process with a script. Although there are many different approaches t... |
This challenge was meant to be introductory, low value, and was intended to inform you of the tjctf{flag} format. All you must do is copy the flag tjctf{y4y_u_R_5aN3} and paste it into the submission box (as instructed). |
# VolgaCTF 2016: lazy
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| VolgaCTF | lazy | Crypto | 250 |
### Description> There's some valuable data on the server. However, to retrieve it we can only execute "signed" commands. We have the server script and some othe... |
Upon close inspection the image contains a dog holding an object with very lightly colored text. Opening the image file in a basic image editor such as Paint.NET, Photoshop, or Gimp and adjusting the contrast, saturation, and/or hue of the image would make the flag appear as tjctf{th3_f0x_jump3d_0v3r_m3} |
We Can Check The File Using file or Strings or hexdump or xxd To Get Some Informations About File This Memory Dump We Can Investigat it, I've Found A Solution Using Volatility Forensics Framework We Can Get Some Precess And Dll's And Administrator Password ....... ./volatility -f memdump.mem ... |
<span>When clicking on the link, you are redirected to a YouTube video of children singing the alphabet backwards. After some figuring, it appears if you match the forward English alphabet with the English alphabet backwards, each letter will substitute into tjctf{n0t_a_ca3s4r_c1ph3r}. The cipher key looks something li... |
This challenge takes some messing around, but if you monitor the data sent from the front end to the back end, you will soon realize they left a major hiccup in their security. All front end infrastructure and all data that hasn't reached the server can be altered. Normally web services will accept the exact text their... |
Because the question points to the red bits, any experienced CTF'er knows this is a reference to least significant bit (LSB) steganography. LSB steganography operates by taking the end of RGB values (only red this time), representing them in binary form (0 - 255), then changing the last bit to either a 0 or a 1 so that... |
#Insomni'hack CTF 2016 : Smartips
**Category:** Network **Level:** easy
> Description : Our smartcat was not so secure so we decided to add a powerful homemade smart IPS. No chance for you to have a flag now! :-)
##Write-up
We got a debugging web interface for this 'homemade IPS' which allow to do a ping from the serve... |
# Collision course
In this task, we were given a hasher binary (`foobar`) and a file, for which we had to finda collision (`collider`), that is a file, which passed as input to `foobar` gives the same hash.There could be many solutions, but only one of them makes sense (is an English text).
Analyzing the assembly, we c... |
# CRC
In this task we were given 26 encrypted zip files. It is easy to notice though, that they havevery small size - they uncompress to 5 byte files. That means we should be able to brute forcethe actual contents, and check their validity using crc, since ZIPs contain CRC32 of their uncompressed contents:```[adam@adam... |
# Incomplete
In this task, we were given a pcap file containing a couple of HTTP requests. They mostly got "Partial Content" response, but asked for the same file. That meant we could extract the requestedfile, but with some small holes.
We have manually extracted the parts of files from the pcap into `24`, `38` and so... |
## DTune (Misc, 70p)
###ENG[PL](#pl-version)
We get an [audio file](Dtune.wav) with recording of someone typing a password.We recognized the sounds as phone dial tones, and therefore we used an Audacity plugin to recognize which buttons were pressed:`8 44 33 0 333 555 2 4 0 444 7777 0 7777 44 2 2 5 6 0 666 333 0 33 7 2... |
## ISolve (PPC)
###ENG[PL](#pl-version)
The task was pretty obvious: the server provides us with a regular expression and we need to supply a string which can be matched by this regex.Since we're lazy we checked if someone has not done this already, and of course they did: https://bitbucket.org/leapfrogdevelopment/rstr... |
## Hidden in Plain Sight (Forensics) tl;dr read the file before it's been decrypted
In this task, we're only given a mega download link.(https://mega.nz/#!6N0gmRLK!VsN9gLdiYbxMVTA-AdsRjsvezMpdEqiR9ngwrS6gR7k)
The hint is: `you need to know the basic principle behind how MEGA works in order to solve this challenge. Flag... |
��## Infinite Paths (Web)
tl;dr Make requests for http://hack.bckdr.in/INFINITE-PATHS/path/..../path//path
Each request to `http://hack.bckdr.in/INFINITE-PATHS/path/path/path/path/path/path/...` returns `Keep roaming buddy!`
Surprisingly `http://hack.bckdr.in/INFINITE-PATHS//path` gives us `A part of the flag(length=5... |
Catch Me!========
* **CTF:** [ASIS CTF Quals 2016](https://asis-ctf.ir/)* **Category:** Reverse* **Points:** 87* **Solves:** 51
> Catch me if you can!
You can download original binary below
[Catch_Me](Catch_Me)
In my opinion this task was hard but not because it was hard to reverse it but this task contains one funckup... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
# Weird Auth 2 - Writeup
## Problem text
Vampire is keen on hacking wierd authentication schemes. He recently pwned this. The source of submit.php is here
## Source for submit.php
```php5) { p("Unacceptable key!"); die; }}
$unlockedPassage = preg_replace($password, $key, $lockedPassage);
if($unlockedPassage ===... |
# BusyBee - Writeup
## Problem text
A deadly virus is killing bees in Busybee's village Busybox, India. Unfortuantely, you have to go to the village to fight the infection. Get the flag virus out of the infected files. Village address: http://hack.bckdr.in/BUSYBEE/infected.tar
## Solution
Downloading the infected tar w... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
# Space FriendsWe have a set of N friends, and M pairwise connections between friends. Each connection goes both ways, so if, for example, Aariss Weiron is friends with Bendelman, then Bendelman is also friends with Aariss Weiron. Each connection also has an associated weight, representing how close the two friends are... |
アクセスすると、HTMLのボタンをデザインする画面が現れました。Submit を押すとそのボタンが現れるとともにどこかに送られるようでしたが、ボタンのスタイルの修正のみが反映されてテキストの変更は反映されませんでした。送られた情報を見ると、ボタンのスタイルは CSS の形式で送られているようでした。そのため、試しに<span>{ background-image: url(https://nhiroki.net/hoge.png); }</span>のようなCSSを送り付けると、サーバから指定した URL にアクセスが来ました。そのため、 CSS から JavaScript を実行する方法について調べていました。アクセスが Fire... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
#!/usr/bin/env python2#-*- coding:utf-8 -*-
import os, sys# https://github.com/zTrix/ziofrom zio import *
nop = [(0,0), (3, 0), (0, 1), (1, 1), (2, 1), (3, 1), (0, 3), (1, 3), (0, 4), (1, 4)]nop2 = [(0,0), (3, 0), (0, 1), (1, 1), (2, 1), (3, 1), (2, 3), (3, 3), (2, 4), (3, 4)]inc_eax = [(1, 0), (0, 1), (2, 1), (1, 2)]i... |
# WoO2-fixed (and WoO2 and WoO)
So this challenge was interesting because it was the first UAF bug that I have ever exploited. Luckily it was a pretty simple one. I also used the UAF bug for the WoO when I believe the goal was to use a heap overflow (oops!). So my one solution ended up working for both challenges.
For ... |
First, we examine the site's cookies by typing document.cookie into the developer console.One of the cookies is named "coookie" and contains the datae2FkbWluOmZhbHNlfQ%3D%3D%3D is the percent encoding for an equals sign, so our data must bee2FkbWluOmZhbHNlfQ==Which can be decoded to>>> import base64>>> base64.b64decode... |
Some googling reveals that the link is for a Google Doc that must be of the formhttps://drive.google.com/file/d/codeIn our case, the url should look likehttps://drive.google.com/file/d/1_TxYCrk5vIMlUjiB1OioXmR7b-Uq_a9aPIh9JyYlPNs/edit?usp=sharingThis document contains the flagabctf{g00gle_driv3_1s_my_f4v0r1t3} |
Using the command,file flagwe learn that "flag" is a gzip archive.Before we unzip the archive, we must rename it "flag.gz"mv flag flag.gzTo unzip the archive, we usegunzip flag.gzThe uncompressed file readsABCTF{broken_zipper} |
In the page source, we see a comment with the base64 encoded stringc3RvcHRoYXRqcw==When we decrypt the string using python, we get>>> import base64>>> b64.decode('c3RvcHRoYXRqcw==')>>> stopthatjsWe use "stopthatjs" as a password, and see the flag appear and quickly disappear.However, the flag still appears in the page ... |
# Feedme - Pwning Problem
## Overview
이문제는 fork를 이용하여 자식프로세를 생성하고 0x00~0xFF까지 size를 받고 그만큼 입력을 받는다.
## Vulnability
입력은 0xFF까지 가능하지만 입력을 받는 공간의 크기는 0x20밖에 되지 않기때문에 BOF가 발생한다. 하지만 Canary가 있기 때문에 단순한 BOF는 아니다.
프로그램을 자세히 살펴보면 fork를 이용하여 자식 프로세스를 만들고 입력을 받기 때문에 Canary는 매번 같다. 그리고 정상종료 되었을 때는 `ATE: 입력값` 이 출력되지만 Canary가 손상되어 ... |
The authentication system in this challenge uses a JSON blob with the user's username, password, and admin status (in that order), encrypted under an unknown key with AES-192 in CBC mode. The authentication cookie can be modified, and we have a partial decryption oracle which gives us the resulting values of "username"... |
Without specifying the block cipher mode to PyCrypto's Crypto.Cipher.AES.AESCipher, ECB mode is used. ECB mode has a number of problems, but one of them involves being able to determine a secret suffix appended to data of your choice encrypted in ECB mode when you are provided with the encrypted data. This is exactly t... |
This solution was not expected by the organisers. It reveals how a XSS may lead to a very effective phishing attack. A very fun way to solve this web challenge :) |
(For a more complete writeup: http://www.johnfren.ch/Black-Jack/)The goal here is to find "a strategy" to win 27 blackjack games in a row.You're given an encrypted rar file and a perl script which implements a blackjack game. If you win 27 games in a row (with at least one "blackjack" win), the game will decrypt the ra... |
# b3s23
> Welcome to b3s23. Enter x,y coordinates. Enter any other character to run.
Basic interaction with the binary quickly indicates that the program interprets the input as the set of live cells on a Conway's Game of Life board. After some minor reverse engineering, we see that the board is stored as a 12100-bit... |
Did this with bash...while read line; do date -d"${line} next year" +%a; done < date.txt | grep Fri | wcShould probably shorten it with a "grep -c" instead of wcRequires gnu date, won't work the same on a Mac. |
Description: Baby's first Buffer OverFLow (https://en.wikipedia.org/wiki/Buffer_overflow). Server: 172.31.1.39:1618 Binary: 172.31.0.10/tyro_overflow1_0601e9d93a2ff84ae7a85dc199fa8233Part of the infrastructure provided at Defcon 24's oCTF was a jumpbox, with an account for every team.While using the jumpbox wa... |
After downloading and unzipping the file provided, it appears as a .DBX file. Googling 'dbx file' indicates the file at hand is a saved message from Microsoft Outlook. Download a free, simple DBX file viewer, then open the DBX file. Reading the message, it refers to an attached file of a computer backup. Most free DBX ... |
Description: Sanity Check 10 --- Hack the ______!Initially we noticed that there was a blank line, which suggested there was a single word answer.Fortunately, at least one of us had seen the movie "Hackers" and recognized this challenge as a partial quotation from that movie.An initial attempt to complete the cha... |
Just a Brief solution:It's a 7z SFXThe child process has some checks + antisfirst its parent process name should be "003.exe" and other checks that leads to Exit or long sleeps ( BP on "Sleep" & "exit" to catch)strings constructed using custom char maps and an index to every charthen it checks windows username and Com... |
Task:<span>Baby's first infoleak (do you even really need the binary?) (https://en.wikipedia.org/wiki/Information_leakage)Server: 172.31.1.36:1616Binary: 172.31.0.10/tyro_infoleak1_bdc3f08dab986b30317b0937a096d794Approach:The binary provided options to see the contents of a memory address using a relative offset or an ... |
Task:<span><span>Something seems weird about this password reset token validator.172.31.0.10/randdumb_978360d545acfc8dea2bbeddec27a211.jsRunning on 172.31.1.51:5534</span> Approach:</span>The server is a simple node.js script that computes a new random token with each request, compares it to the submitted random token,... |
#Rain or Shine
I've been working so hard on problems that I didn't even notice it was raining outside. I decided to take a short break and record some ambient sound for a game I've been working on, and just for fun I stuck a flag somewhere in there too! Can you find it for me?
**Hint:** *If you're stuck, start [here](h... |
Task:<span><span>Baby's second infoleak, a tiny bit harder. (https://en.wikipedia.org/wiki/Information_leakage)Server: 172.31.1.37:1615Binary: 172.31.0.10/tyro_infoleak2_3a3b043ca422415917e99afdc20618e5</span> </span>Approach:This task was identical to infoleak1 except that absolute addresses were not allowed. Since we... |
The ciphertext is base-34 encoded. There aren't many clues that would suggest what the problem is, except analysis of the character set. The characters used are within the lowercase letter set and digits, suggesting the possibility of a number encoded as base >16. The highest character observed is 'x', which is present... |
b *0x080492a4commands 1 set $last_data = $eax call memcpy($tmp, $last_data, 0x14) continueend
b *0x080492adcommands 2 call memcpy($last_data, $tmp, 0x14) set $argv = *(char***)($ebp+0xc) set $flag = $argv[1] set $i = *(int*)($esp+0x18) set $flag[$i] += 1 x/s $flag set $eip = 0x0804927e ... |
##Static analysisThis one is a .NET application ,i opened it in dnspy , it is not obfuscated .It has few functions "Key_Click" in "Form1" class is the function used as event handler for the keys ,set in the constructor of the class,. There are 8 if statements that must be satisfied in a specific order, luckliy the or... |
This file is x64 native app ,it has a text box and validate button.The file is not packed and strings are not obfuscated , goodboy and badboy messages are plaintext in the file Cross referencing the goodboy message leads to a function that has a call to GetDlgItemTextW, this is the function that will get the... |
##Static analysisThis file has no strings , no imports and not packed.
##Dynamic/code analysisThe code starts like this  It finds functions dynamically , the "key buffer" is filled with the output of some api calls ,the code is designed for a specific operating system configuration.By tracing the "key buff... |
This was a set of bonus points awarded to Neg9 for finding another team's RSA private key stored in their world readable home folder on the community jump box. Neg9 connected as the team, and spammed the wall about how this account was own3d. Then changed permissions and moved the private key to a more appropriate .s... |
## Worst Pwn Ever (Pwn)
###ENG[PL](#pl-version)
We get netcat connection parameters to work with.After connecting to the server we get a custom command-line prompt, but typing some random things cause the connection to close.Some fuzzing lead us to typing `1+()` which crashes with a nice python exception that we can't ... |
Task:<span><span>Baby's third infoleak even a tiny mit more even than hard to have. (https://en.wikipedia.org/wiki/Information_leakage)Server: 172.31.1.38:1614Binary: 172.31.0.10/tyro_infoleak3_b2d435964aac6bc1098ce62d35cba9af</span> </span>Approach:This challenge was identical to infoloeak2 with the added restriction ... |
##Static analysisThe website said that this challenge has a kernel driver. The name of the file is loader so we probably dont care about it , only the loaded driver, so i opened it in CFF explorer and extracted the 3 files. 
* there are two PE64 files, one of them has some metadata that indicates that it Di... |
Description: Mr. Moneybags is taking a day off - but new users get $500 just for joining! I bet you could earn over $100,000 this way! server: http://172.31.1.55/<h2>Exploration</h2>Hitting the URL with a browser shows a simple web service with a registration link. Signup requires a username, a password, and a si... |
# Misc 200: hsab
Connecting to the server we give a proof of work, and then we are dropped into a shell.No other programs are loaded with it, checking /bin with```cd /binecho *```we see only bash and a server binary. Checking /home there is a ctf/ directory and inside is flag.raywhich probably contains the flag, the on... |
.NET APP just copy the validation code in 'btnCheck_Click' and bruteforce the 3 values, or you can analyze the code a bit more and find the xor deobfuscation.
```__author__ = 'abd el rahman'#RGB.exe
x = [113,96,111,90,77,21,67,88,83,16,79,22,73,126,82,21,88,91,126,89,17,83,16,82,126,21,76,21,91,16,79,70,92]key = x[3] ... |
## Offensive 400 (Offensive, 400p) ###ENG[PL](#pl-version)
Challenge starts on webpage which doesn't contain anything (or it looks like this). But after looking at the source code we spot interesting javacript file (named "ads.js"). After deobfuscation it looked like this:
```javascriptvar mnt = function() { window.hos... |
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