高校战“疫”网络安全分享赛 Misc ez_mem&usb

打开之后是一个流量包

用wireshark导出HTTP文件，有个upload,用一下binwalk，出来了一个镜像文件

 用volatility搜一下，命令里有一个密码，看见了但是后来给忘了。。。

文件里有一个flag.img，导出

里面有一个压缩包，导出

或者用取证大师直接打开data.vmem就能看到压缩包

用cmd里的密码解压压缩包

一串字符，可以看出是usb键盘与电脑通信的流量

用一下网上搜到的脚本

import sys
import os
 
 
usb_codes = {
   0x04:"aA", 0x05:"bB", 0x06:"cC", 0x07:"dD", 0x08:"eE", 0x09:"fF",
   0x0A:"gG", 0x0B:"hH", 0x0C:"iI", 0x0D:"jJ", 0x0E:"kK", 0x0F:"lL",
   0x10:"mM", 0x11:"nN", 0x12:"oO", 0x13:"pP", 0x14:"qQ", 0x15:"rR",
   0x16:"sS", 0x17:"tT", 0x18:"uU", 0x19:"vV", 0x1A:"wW", 0x1B:"xX",
   0x1C:"yY", 0x1D:"zZ", 0x1E:"1!", 0x1F:"2@", 0x20:"3#", 0x21:"4$",
   0x22:"5%", 0x23:"6^", 0x24:"7&", 0x25:"8*", 0x26:"9(", 0x27:"0)",
   0x2C:"  ", 0x2D:"-_", 0x2E:"=+", 0x2F:"[{", 0x30:"]}",  0x32:"#~",
   0x33:";:", 0x34:"'\"",  0x36:",<",  0x37:".>", 0x4f:">", 0x50:"<"
   }
 
def code2chr(filepath):
    lines = []
    pos = 0
    for x in open(filepath,"r").readlines():
        code = int(x[6:8],16)   # 即第三个字节
        if code == 0:
            continue
        # newline or down arrow - move down
        if code == 0x51 or code == 0x28:
            pos += 1
            continue
        # up arrow - move up
        if code == 0x52:
            pos -= 1
            continue
 
        # select the character based on the Shift key
        while len(lines) <= pos:
            lines.append("")
        if code in range(4,81):
            if int(x[0:2],16) == 2:
                lines[pos] += usb_codes[code][1]
            else:
                lines[pos] += usb_codes[code][0]
        
    for x in lines:
        print(x)
 
 
if __name__ == "__main__":
    # check argv
    filepath = 'usbdata.txt'
    code2chr(filepath)
    '''
    if len(sys.argv) != 2:
        print("Usage:\n\tpython keyboardScanCode.py datafile.txt\nhow to get datafile:\t tshark -r file.usb.pcapng -T fields -e usb.capdata > datafile.txt")
        exit(1)
    else:
        filepath = sys.argv[1]
        code2chr(filepath)
    '''