xermicus

Keybase proof

I hereby claim:

• I am xermicus on github.
• I am xermic (https://keybase.io/xermic) on keybase.
• I have a public key whose fingerprint is DBBF E288 93F0 32CA D1FB B554 B7A0 A849 3D39 67B6

To claim this, I am signing this object:

xermicus

## Command Mode

pdf @ main
-> print disassembly from main function

afl
-> list all functions

iz; izz
-> list strings; list more strings

xermicus

# http://crackmes.de/users/fr0gsek/fr0g_kgm1/

key = 'SeRiAlAbCdEfGhIjKlMnOpQrStUvWxYz'[::-1]

user = ''
while len(user) < 5:
        user = input('login [min 5 chars]: ')

serial = ''
for i in range(32):

xermicus

# http://crackmes.de/users/damo2k/damos_crackme_1_for_linux/

import random, sys
random.seed()

serial = [None] * 10

#1_10
c = random.randint(0x64, 0x7a)
serial[9] = chr(c)

xermicus

# http://crackmes.de/users/pancake/pcme0/

# This is not perfect, it fails to recover one specific char in the flag
# Idk what's going on there, but found it out anyway :)
# (In the final flag, the non-printable char '\0x18' should be '0'. Flag is 10 chars long.)

import sys,r2pipe

r2profile = '#!/usr/bin/rarun2\nprogram=./pcme0\nstdin=stdin.txt\nstdout='
with open('profile.rr2', 'w') as f:

xermicus

# http://crackmes.de/users/geyslan/crackme.02.32/

import random
random.seed()

password = ''
secret = '\xf7\xf8\xf1\xf4\xf1\xf8\xb3\xfc\xfc'

for i in range(len(secret)):
        candidates = ''

xermicus

# http://crackmes.de/users/macabre/rccrackme/

# NOTE: This keygen finds correct serial, but fails to insert the hyphens '-' in the
#       correct (correct in terms of the crackme) way. It gave me headaches trying 
#       to do this in python, but I think it should be easy to implement it in C.

user = input("Enter username: ")

user *= 9 // len(user) + 1 if len(user) < 10 else 1
print('User: ' + user)

xermicus

This was a very fun crackme! Instead of providing a simple "password: " prompt or something like that the author actually wrote a tiny game to play with.


	# ./spacemision
	Hello, ...?
	Hello, chief reverse engineer root of the spaceship rbinsegfaulter?
	Can you hear, me?
	Oh, these speakers seem to be broken.
	No matter, if you hear me, or not, this is probably our last chance to survive!
	We got attacked from the evil aliens from the binja-system!

xermicus

Description='netctl profile for hslu'
Interface=wlp3s0
Connection=wireless
Security=wpa-configsection
ESSID=hslu
IP=dhcp
WPAConfigSection=(
	'ssid="hslu"'
	'proto=RSN'
	'key_mgmt=WPA-EAP'

xermicus

#!/bin/bash

# Example for DMATH.
# Adapt the "ref_XXXXXXX" for other subjects (it's the same as the web URI while browsing):
sudo mount -t davfs https://elearning.hslu.ch/ilias/webdav.php/hslu/ref_3779056/ /mnt/ilias/DMATH