# [Dart], 165 bytes

    F(List s)=>s.indexWhere((a)=>a.contains('*'));f(String s){var b=s.split('\n'),v=F(b),c=b[v].split('  '),w=F(c),x=c[w].indexOf('*')+1;return '${w+1}${b.length-v}$x';}

[Try it online!][TIO-jo4e614p]

[Dart]: https://www.dartlang.org/
[TIO-jo4e614p]: https://tio.run/##hZFNa4NAEIbv/orFCPsRI6jJocjmmFOhhx56SHNQo4mQbsO6VUH87XZ0tcYmpYvovvPMOzMyx1Cqtt2R5yxXKKd8mzuZOCbV2zmRCSEhREIn/hQqzEROMMOUBil5VTITJ8ivi1CiiOdOfr1kiuB3gald8B2JqB3zaF8cRoIQkBJITO2Kx/vyoBu9pH3VpRvIRH1JgbBVl0u3serIuSTipM6rorEqHDRt10t5iCPTNBfdMaY3u7kvgAeG0af7HAQaj86ZS4Tm@n8OoeHRfK7hy24GWHcDaM9onC69Za7GIe@C7If95Zmw7v8BOyO0hv@5wrpgB1adEpOZtEGrLXJdF9PgF9RlmS4@JPoPEpU3FPE398zX7OmRb63ZxvM71rTf "Dart – Try It Online"