⌨️

Firebird CTF: TunningU5B(MISC)

 

2nd 🩸

Author: Nuttyshell ivan
 

Brainf**k

 
The following command is used to extract USB data from a .pcapng file:
tshark -r usb1.pcapng -T fields -e usb.capdata > userdata.txt
 
usbdata.txt
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To reconstruct the keyboard key presses from the extracted data, i write a script titled key.py. The expected result of the script is to simulate the key press process.
normalKeys = { "04":"a", "05":"b", "06":"c", "07":"d", "08":"e", "09":"f", "0a":"g", "0b":"h", "0c":"i", "0d":"j", "0e":"k", "0f":"l", "10":"m", "11":"n", "12":"o", "13":"p", "14":"q", "15":"r", "16":"s", "17":"t", "18":"u", "19":"v", "1a":"w", "1b":"x", "1c":"y", "1d":"z","1e":"1", "1f":"2", "20":"3", "21":"4", "22":"5", "23":"6","24":"7","25":"8","26":"9", "27":"0","28":"<RET>","29":"<ESC>","2a":"<DEL>", "2b":"\t", "2c":"<SPACE>","2d":"-","2e":"=","2f":"[","30":"]","31":"\\", "32":"<NON>","33":";","34":"'","35":"<GA>","36":",","37":".", "38":"/","39":"<CAP>","3a":"<F1>","3b":"<F2>", "3c":"<F3>","3d":"<F4>","2b": "[tab]", "3e":"<F5>","3f":"<F6>","40":"<F7>","41":"<F8>","42":"<F9>","43":"<F10>", "44":"<F11>","45":"<F12>","2F":"[","53":"<NUM>", "54":"/", "55":"*", "56":"-", "57":"+","58":"<ENTER>", "59":"1", "5a":"2", "5b":"3", "5c":"4","5d":"5", "5e":"6", "5f":"7", "60":"8", "61":"9"} shiftKeys = { "04":"A", "05":"B", "06":"C", "07":"D", "08":"E", "09":"F", "0a":"G", "0b":"H", "0c":"I", "0d":"J", "0e":"K", "0f":"L", "10":"M", "11":"N", "12":"O", "13":"P", "14":"Q", "15":"R", "16":"S", "17":"T", "18":"U", "19":"V", "1a":"W", "1b":"X", "1c":"Y", "1d":"Z","1e":"!", "1f":"@", "20":"#", "21":"$", "22":"%", "23":"^","24":"&","25":"*","26":"(","27":")", "28":"<RET>","29":"<ESC>","2a":"<DEL>", "2b":"\t","2c":"<SPACE>", "2d":"_","2e":"+","2f":"{","30":"}","31":"|","32":"<NON>","33":"\"", "34":":","35":"<GA>","36":"<","37":">","38":"?","39":"<CAP>","3a":"<F1>", "3b":"<F2>", "3c":"<F3>","3d":"<F4>","3e":"<F5>","3f":"<F6>","40":"<F7>", "41":"<F8>","42":"<F9>","43":"<F10>","44":"<F11>","45":"<F12>"} output = [] keys = open('usbdata.txt') for line in keys: try: if line[0]!='0' or (line[1]!='0' and line[1]!='2') or line[3]!='0' or line[4]!='0' or line[9]!='0' or line[10]!='0' or line[12]!='0' or line[13]!='0' or line[15]!='0' or line[16]!='0' or line[18]!='0' or line[19]!='0' or line[21]!='0' or line[22]!='0' or line[6:8]=="00": continue if line[6:8] in normalKeys.keys(): output += [[normalKeys[line[6:8]]],[shiftKeys[line[6:8]]]][line[1]=='2'] else: output += ['[unknown]'] except: pass keys.close() flag=0 print("".join(output)) for i in range(len(output)): try: a=output.index('<DEL>') del output[a] del output[a-1] except: pass for i in range(len(output)): try: if output[i]=="<CAP>": flag+=1 output.pop(i) if flag==2: flag=0 if flag!=0: output[i]=output[i].upper() except: pass print ('output :' + "".join(output))
*/<NUM>74156/52<NUM>741/95389*/<NUM>74123<NUM>74123698/52<NUM>741/953*96321478/74274123698<NUM>741563123745963217412369874123691239874123/741963574153+<ENTER>123*/<NUM>789632189*/<NUM>7412389*/<NUM>74123123<NUM>741/89*-+<ENTER>74596321123<NUM>741953<NUM>/*978632174596321<NUM>7412369874123698/7419635<NUM>741/953*96321478/96
Based on the keyboard scancode table, the extracted key codes correspond to a numeric keypad.
 
notion image
*/<NUM>74156:f /52:i <NUM>741/953:r 89*/<NUM>74123:e <NUM>74123698:b *96321478:d /742:{ 74123698:0 or o <NUM>741563:h 123:_ 74596321:y 7412369:u 9874123:c /962:} 123:_ /7419635:a */<NUM>7896321:s 74153+<ENTER>:n <NUM>741953:k <NUM>/*9786321:3 <NUM>741/89*-+<ENTER>:m
By mapping the key presses according to the scancode table, you can draw a representation of the keyboard and determine the flag.
 
firebird{oh_y0u_can_see_my_k3yb0ard}
 
ivan spend too much time on this task.
:(