  The QGP that might be created in ultrarelativistic heavy-ion collisions is
expected to radiate thermal dilepton radiation. However, this thermal dilepton
radiation interferes with dileptons originating from hadron decays. In the
invariant mass region between the $\phi$ and $J/\Psi$ peak ($1\,$GeV$\lesssim
M_{\ell^+ \ell^-} \lesssim 3 \,$GeV) the most substantial background of hadron
decays originates from correlated D$\bar{\mathrm{D}}$-meson decays. We evaluate
this background using a Langevin simulation for charm quarks. As background
medium we utilize the well-tested UrQMD-hybrid model. The required drag and
diffusion coefficients are taken from a resonance approach. The decoupling of
the charm quarks from the hot medium is performed at a temperature of
$130\,$MeV and as hadronization mechanism a coalescence approach is chosen.
This model for charm quark interactions with the medium has already been
successfully applied to the study of the medium modification and the elliptic
flow at FAIR, RHIC and LHC energies. In this proceeding we present our results
for the dilepton radiation from correlated D$\bar{\mathrm{D}}$ decays at RHIC
energy in comparison to PHENIX measurements in the invariant mass range between
1 and 3 GeV using different interaction scenarios. These results can be
utilized to estimate the thermal QGP radiation.
