2021网刃杯-baby-usb

提取数据

用tshark命令可以提取对应的Leftover Capture Data域中数据：

tshark -r key.pcapng -T fields -e usb.capdata | sed '/^\s*$/d' > usbdata1.txt

无法用kali的root用户来运行命令 只能用普通用户

提取键盘流量

将生成的数据用脚本处理

f=open('C://Users//Anneliese//Desktop//网刃杯//misc//usbdata1.txt','r')
fi=open('C://Users//Anneliese//Desktop//网刃杯//misc//out.txt','w')
while 1:
    a=f.readline().strip()
    if a:
        if len(a)==16: # 鼠标流量的话len改为8
            out=''
            for i in range(0,len(a),2):
                if i+2 != len(a):
                    out+=a[i]+a[i+1]+":"
                else:
                    out+=a[i]+a[i+1]
            fi.write(out)
            fi.write('\n')
    else:
        break
fi.close()

得到文件out.txt

还原信息

提取出键盘流量后需要用脚本还原数据对应的信息

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":"","29":"","2a":"", "2b":"\t",
         "2c":"","2d":"-","2e":"=","2f":"[","30":"]","31":"\\",
         "32":"","33":";","34":"'","35":"","36":",","37":".",
         "38":"/","39":"","3a":"","3b":"", "3c":"","3d":"",
         "3e":"","3f":"","40":"","41":"","42":"","43":"",
         "44":"","45":""}
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":"","29":"","2a":"", "2b":"\t","2c":"",
          "2d":"_","2e":"+","2f":"{","30":"}","31":"|","32":"","33":"\"",
          "34":":","35":"","36":"<","37":">","38":"?","39":"","3a":"",
          "3b":"", "3c":"","3d":"","3e":"","3f":"","40":"",
          "41":"","42":"","43":"","44":"","45":""}
output = []
keys = open('out.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 output[a]
        del output[a-1]
    except:
        pass
for i in range(len(output)):
    try:
        if output[i]=="":
            flag+=1
            output.pop(i)
            if flag==2:
                flag=0
        if flag!=0:
            output[i]=output[i].upper()
    except:
        pass
print ('output :' + "".join(output))

> ct<DEL>onh<DEL>gratue<DEL>latioke<DEL><DEL>nsonfiny<DEL>dingmebutiwii<DEL>llns<DEL>ottellyouwheretqa<DEL><DEL>hepz<DEL>asswordws<DEL><DEL>ox<DEL>fwe<DEL>od<DEL>rddoc<DEL>cumentisgoarfv<DEL><DEL><DEL>ndfinditagain output :congratulationsonfindingmebutiwillnottellyouwherethepasswordofworddocumentisgoandfinditagain

可以看到删除的就是key

The key is qazwsxedcrfv

word文件

参考：http://www.ga1axy.top/index.php/archives/22/
参考：https://wp.n03tack.top/posts/1010/#baby-usb