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Dame Dango

FWO FWF

Points: 587 [1000]

Description

As part of forensic investigations into servers operated by COViD, an investigator found this web server containing a hidden secret. Help us find the contents of this secret.

Web Server

Solution

  1. The webpage shows some gibberish characters when we visit it. From the developer console, we can see some internal CSS with three classes a, b and c. Initial
  2. If we were to toggle between the classes, we will see that the flag is in a file called csg.txt. Show A Show B
  3. Visiting http://yhi8bpzolrog3yw17fe0wlwrnwllnhic.alttablabs.sg:40731/CSG.TXT will yield the Base64 string:

    Rmo0Y19HdTNfZkdsWTNfaTFmMW8xWTFHbAo=

  4. Decoding the Base64 string does not directly give the flag, but it gave a ciphertext of Fj4c_Gu3_fGlY3_i1f1o1Y1Gl.
  5. By playing around with all the ciphers in CyberChef, we can see they just used ROT13 to encode the string… Cyberchef

    Flag

    govtech-csg{Sw4p_Th3_sTyL3_v1s1b1L1Ty}