It may have been registered in Laos, but I doubt it has ever landed in Vientiane. The company is based out of Sharjah. Maybe Laos is easing up on their registration requirments, and could become the next "Equatorial Guinea" for SHJ based operators.
That is the same crew list as I have seen. In addition, it seems that this aircraft originally was operated with the Ukrainian Air Force.
Also heard the same thing in regards to the fog, and after reading it, I wondered why they would try to land at Baucau after 3 attempts, when they could have diverted to Dili instead. One doesn't think of East Timor and fog, as it is basically a tropical island, but the Baucau region is quite "mountainous" from what I remember.