I don't know if this was painted before
GW changed their range, but to me it looks like:
Ruff/neck: Scorched Brown
Body: Vomit brown over Vermin brown or Calthan.
Both cases brought up with Bleached Bone / Kammando Khaki
http://www.dakkadakka.com/wiki/en/Paint_Range_Compatibility_Chart
YMMV, I'm not great at browns/greens.