Alien Object (Misc)

-$ cd ..

Here is the image that the creator of the challenge gave us. alt text

We executed exiftool on the image in the following way:

exiftool cosmos.jpg

  ExifTool Version Number         : 11.30
  File Name                       : cosmos.jpg
  Directory                       : .
  File Size                       : 8.5 MB
  File Modification Date/Time     : 2019:03:15 14:40:52+01:00
  File Access Date/Time           : 2019:03:15 14:48:06+01:00
  File Inode Change Date/Time     : 2019:03:15 14:45:17+01:00
  File Permissions                : rw-r--r--
  File Type                       : JPEG
  File Type Extension             : jpg
  MIME Type                       : image/jpeg
  JFIF Version                    : 1.01
  DCT Encode Version              : 100
  APP14 Flags 0                   : (none)
  APP14 Flags 1                   : (none)
  Color Transform                 : YCbCr
  Exif Byte Order                 : Big-endian (Motorola, MM)
  Compression                     : LZW
  Photometric Interpretation      : RGB
  Camera Model Name               : UEsDBBQAAAAIALiOMk4NBnn9agAAAGgAAAABAAAAZnPPz09R8MpPUlSIzC9VSMsvzUtRKMlIVUjLSUxXVPBILUpVyCxRyCy24uXi5XIODqoO8TBWdvQxNA6t80/yMvYP0Q03CY4vLk1Odi22SAvNMYyMTzPIK3XRNczTDTFJ1XM2KPb1D1asBQBQSwECHwAUAAAACAC4jjJODQZ5/WoAAABoAAAAAQAkAAAAAAAAACAAAAAAAAAAZgoAIAAAAAAAAQAYAG4+r2JOr9QBHHgxf02v1AEceDF/Ta/UAVBLBQYAAAAAAQABAFMAAACJAAAAAAA=
  ...

Thanks to this command, we found that the camera model name was a base64 so we decoded it

echo "UEsDBBQAAAAIALiOMk4NBnn9agAAAGgAAAABAAAAZnPPz09R8MpPUlSIzC9VSMsvzUtRKMlIVUjLSUxXVPBILUpVyCxRyCy24uXi5XIODqoO8TBWdvQxNA6t80/yMvYP0Q03CY4vLk1Odi22SAvNMYyMTzPIK3XRNczTDTFJ1XM2KPb1D1asBQBQSwECHwAUAAAACAC4jjJODQZ5/WoAAABoAAAAAQAkAAAAAAAAACAAAAAAAAAAZgoAIAAAAAAAAQAYAG4+r2JOr9QBHHgxf02v1AEceDF/Ta/UAVBLBQYAAAAAAQABAFMAAACJAAAAAAA=" | base64 -D > out.zip

We now have a zip file

unzip out.zip

  Archive:  out.zip
  inflating: f    

We now have a file f

cat f

    Good Job! You found the flag! Here it is:
    CSR{TH3#AL13U~ObJ3OT-W4S_succEs8fUl1Y_f0nuD-1n-T4e.C0sMOS!}