Offense and defense in the world reverse tt3441810

tt3441810 tinyctf-2014

 

Attachment to a bunch of data, hexadecimal data portion is extracted,

 

 flag should be hidden in it, (is this wisdom re,)

Reservations can display characters, and then remove the fill character (to find the law 0.0)

Processing script:

 

 1 text=[0x68, 0x66, 0x6C, 0x00, 0x00, 0x48, 0xBF, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48,
 2     0x8D, 0x34, 0x24, 0x48, 0xBA, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0xB8, 0x01,
 3     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x05, 0x68, 0x61, 0x67, 0x00, 0x00, 0x48, 0xBF,
 4     0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x8D, 0x34, 0x24, 0x48, 0xBA, 0x02, 0x00,
 5     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0xB8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 6     0x0F, 0x05, 0x68, 0x7B, 0x70, 0x00, 0x00, 0x48, 0xBF, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 7     0x00, 0x48, 0x8D, 0x34, 0x24, 0x48, 0xBA, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48,
 8     0xB8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x05, 0x68, 0x6F, 0x70, 0x00, 0x00,
 9     0x48, 0xBF, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x8D, 0x34, 0x24, 0x48, 0xBA,
10     0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0xB8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
11     0x00, 0x00, 0x0F, 0x05, 0x68, 0x70, 0x6F, 0x00, 0x00, 0x48, 0xBF, 0x01, 0x00, 0x00, 0x00, 0x00,
12     0x00, 0x00, 0x00, 0x48, 0x8D, 0x34, 0x24, 0x48, 0xBA, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
13     0x00, 0x48, 0xB8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x05, 0x68, 0x70, 0x72,
14     0x00, 0x00, 0x48, 0xBF, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x8D, 0x34, 0x24,
15     0x48, 0xBA, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0xB8, 0x01, 0x00, 0x00, 0x00,
16     0x00, 0x00, 0x00, 0x00, 0x0F, 0x05, 0x68, 0x65, 0x74, 0x00, 0x00, 0x48, 0xBF, 0x01, 0x00, 0x00,
17     0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x8D, 0x34, 0x24, 0x48, 0xBA, 0x02, 0x00, 0x00, 0x00, 0x00,
18     0x00, 0x00, 0x00, 0x48, 0xB8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x05, 0x68,
19     0x7D, 0x0A, 0x00, 0x00, 0x48, 0xBF, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x8D,
20     0x34, 0x24, 0x48, 0xBA, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0xB8, 0x01, 0x00,
21     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x05, 0x48, 0x31, 0xFF, 0x48, 0xB8, 0x3C, 0x00, 0x00,
22     0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x05 ]
23 t=[]
24 for x in text:
25     if x>=32 and x<=125:
26         t.append(x)
27 s=''.join(map(chr,t))
28 print(s)
29 s=s.replace('HH4$HH','')
30 print(s)
31 s=s.replace('h','')
32 print(s)

Output:

hflHH4 $ HHhagHH4 $ HHh {pHH4 $ HHhopHH4 $ HHhpoHH4 $ HHhprHH4 $ HHhetHH4 $ HHh} HH4 $ HHH1H <
hflhagh {phophpohprheth} H1H <
flag {poppopret} H1H <

 

 

Offense and defense in the world to submit poppopret

0.0, try a few days, I am helpless