F82991 is a TTH maintenance worker who appears in the fifth Private Room chat, who also goes by the initials “SS”. It is likely that their terminal was infected with Long String in LOG-123.mp4.
SS: MAINTENANCE; F82991 SPEAKING, WHO IS THIS?
CLS: HELLO, THIS IS RECEIVER #439 ON FPIDI 9
SS: OH I KNOW YOU, YOU'RE THE GUY WHO PURGED HIS TERMINAL RIGHT?
CLS: YES, DO I NEED TO GO INTO SPECIFICS OF WHY I DID THAT OR ARE YOU GOING TO HELP ME
F82991?
SS: SORRY, HOW MAY I HELP YOU?
CLS: I NEED TO KNOW HOW TO GET RID OF LONG_STRING ON THIS WITHOUT PURGING MY TERMINAL
AGAIN
SS: OKAY FIRST THING YOU WILL NEED TO DO IS:
(screen cuts to black).
The screen is then filled with the repeating text: "INFECTED BY LONG STRING ;-)"