The software works silently in the background and sends real-time screenshots to the attackers when the victim is logged into their poker software.
The attackers can simply join your cash game poker table and know exactly what your hole cards are, this gives them a huge advantage like UB poker used god-mode a few years back.
Anti-Virus programs like Avast and Avira are able to detect and remove the unwanted virus from your computer. According to PokerStars and FullTilt they are aware of the issue and have found no evidence that any players have lost funds since the virus was released in April.