Who did Kreatcher talk to in OOTP?

[Hagrid]

No: HPFGUIDX 161298

aussie writes:

I haven't finished my re-read of OOTP (Order Of The Phoenix) yet, but 
there were a lot of JKR clues that gave the impression Kreatcher went 
to speak to someone.

>From the time Harry explained his vision or Mr Weasley's attack to 
Sirius (with Kreatcher standing outside the door) Kreatcher would 
disappear, and have a different attitude when he returned.

When Harry checked to see if Sirius was in Grimauld Place, Kreatcher 
had bandages on his hands (Dobby-like injury after disobeying his 
master).

any ideas? Has this been in discussions before?
Aussie