MalwareTech-shellcode1.py

#MalwareTech Challenge: shellcode1 (solver)
#link: https://www.malwaretech.com/challenges-shellcode1
# -- sad0p

def rotate_left(input_byte, count):

    input_byte = bin(input_byte).lstrip('0b')
    while(len(input_byte) < 8):
        input_byte = '0' + input_byte

    #00110_010 => 010_00110
    input_byte = input_byte[count - 8:] + input_byte[:count] 
    return int(input_byte, 2)

def main():
    mb_flag = [0x32, 0x62, 0x0A, 0x3A, 0xDB, 0x9A, 0x42, 0x2A, 0x62, 0x62, 0x1A, \
               0x7A, 0x22, 0x2A, 0x69, 0x4A, 0x9A, 0x72, 0xA2, 0x69, 0x52, 0xAA, \
               0x9A, 0xA2, 0x69, 0x32, 0x7A, 0x92, 0x69, 0x2A, 0xC2, 0x82, 0x62, \
               0x7A, 0x4A, 0xA2, 0x9A, 0xEB]

    count = 0;
    while(count < len(mb_flag)):
        mb_flag[count] = rotate_left(mb_flag[count], 5)
        count = count + 1
    
    for c in mb_flag:
        print(chr(c), end='')

if __name__ == '__main__':
    main()