Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

2f9423b0a082c0a1bdfd6cd82e94cfbf0a7839dd445671d7290a2108c9f03fdb5d246ac5f84fdd37fc6870d7f6f4d3c7d5774fb7203df89c96a870e78930bf9c

Ciphertext (hexencoded):

2f9423b0a082c0a1bdfd6cd82e94cfbf 0a7839dd445671d7290a2108c9f03fdb 5d246ac5f84fdd37fc6870d7f6f4d3c7 d5774fb7203df89c96a870e78930bf9c

Plaintext (hexencoded):

2f9423b0a082c0a1bdfd6cd82e94cfbf 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

/\x94#\xb0\xa0\x82\xc0\xa1\xbd\xfdl\xd8.\x94\xcf\xbf {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

{"username": "guest", "is_guest": true}