Strange encryption in the articles of the site on Drupal

Question

Encryption

Strange messages began to appear in the articles, from different users. Apparently, they are written by bots. For example:

ZO WS PK IQ KG YH EN GO XK SM GC HQ ZD QJXS GK LX TN EW BB TB NH KE ZB AEHR BG BG BE ZX WG EP ZK EJ GT AQ AB DD VG SDNI WK SK KV MOFREI.EDU KZ SV PQ PZ BRUE OG JL EL NU ZO HK GM LIUT FF FO NO BH VP LVPY YD GPAN BQ WT BR

In Google for the keyword MOFREI.EDU finds many similar articles, comments.
Who knows what it is? Botnet commands?

Answer 1

Captcha must be kept on the site. I once didn’t follow and in a few days I have 20,000+ comments

Answer 2

This message is enigma en.wikipedia.org/wiki/Enigma
Need to translate and write an answer :)

Answer 3

I drove a pack of such messages (16 pieces) into the tablet - I started to look to see if they are repeated in the same places ... sometimes there are two identical two-letter ones (columns 4, 18, 21, 25, 35) ... and then I got to column 42 - it turned out to be MORFEI. EDUs
were repeated again two-letter ones and only in some two lines (in columns 54, 59, 62, 66) Two-letter ones were repeated
:
XX UW BE HI FP PB GX EF
UB UB” received a link to a Chinese book…
So it looks like a Chinese conspiracy!
</paranoid>

Answer 4

IMHO, wrong encoding.