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Points: 101 | Solves: 597/653 | Category: Forensics

Unzip flag.zip.

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Bahasa Indonesia

English

We got flag.zip and makefile.sh.

This is the content of makefile.sh.

echo 'SECCON{'`cat key`'}' > flag.txt
zip -e --password=`perl -e "print time()"` flag.zip flag.txt

We need to know the Unix time of date created of flag.zip.

By using ls -l we can know the file timestamp is Fri, Oct 26 2018 15:10:41 UTC. We can convert the timestamp to Unix time and use it to open flag.zip.

$ php -a
Interactive shell

php > echo strtotime('Fri, Oct 26 2018 15:10:41');
1540566641

$ unzip flag.zip
Archive:  flag.zip
[flag.zip] flag.txt password: 1540566641
  inflating: flag.txt

$ cat flag.txt
SECCON{We1c0me_2_SECCONCTF2o18}

Flag: SECCON{We1c0me_2_SECCONCTF2o18}

Bahasa Indonesia

Kita dapat flag.zip dan makefile.sh.

Berikut adalah isi dari makefile.sh.

echo 'SECCON{'`cat key`'}' > flag.txt
zip -e --password=`perl -e "print time()"` flag.zip flag.txt

Kita harus mengetahui Unix time dari waktu flag.zip dibuat.

Dengan menggunakan ls -l kita dapat tahu timestamp dari file adalah Fri, Oct 26 2018 15:10:41 UTC. Kita dapat mengkonversikannya menjadi Unix time dan menggunakannya untuk membuka flag.zip.

$ php -a
Interactive shell

php > echo strtotime('Fri, Oct 26 2018 15:10:41');
1540566641

$ unzip flag.zip
Archive:  flag.zip
[flag.zip] flag.txt password: 1540566641
  inflating: flag.txt

$ cat flag.txt
SECCON{We1c0me_2_SECCONCTF2o18}

Flag: SECCON{We1c0me_2_SECCONCTF2o18}