  Inspired by the updated information on $\Omega(2012)$ by the Belle
Collaboration, we conduct a study of all possible $S$-wave pentaquark systems
with quark contents $sssq\bar{q},q=u,d$ in a chiral quark model with the help
of Gaussian expansion method. Channel coupling is also considered. The
real-scaling method (stabilization method) is employed to identify and check
the bound states and the genuine resonances. In addition, the decay widths of
all resonances are given. The results show that $\Omega(2012)$ can be
interpreted as a $\Xi^*K$ molecular state with quantum number of
$IJ^P=0(\frac{3}{2})^-$. Other resonances are obtained: $\Xi^* K^*$ with
$IJ^P=0(\frac{1}{2})^-$ and$0(\frac{3}{2})^-$, $\Omega\pi$ with
$IJ^P=1(\frac{3}{2})^-$. These pentaquark states is expected to be further
verified in future experiments.
