QQPASS is an old but still-growing family of spyware, worms, backdoors, Trojans, and even scripts that steal Tencent QQ login information. QQPASS's motives are not as straightforward as that of other Trojan spywares', like TSPY_LINEAGE and TSPY_BANKER. Monetary reward, however, is the likely motive pushing this threat family to stay in the wild for so long and evolve with the changing threat landscape.

Read an article that documents QQPASS's behavior and describes how attackers can use stolen information, here: QQ Me... But TC :(.