According to security researchers* over 20 handsets from various Chinese manufacturers have malware pre-installed (after they leave the factory but before they get to the consumer).
Source: http://mobile.slashdot.org/story/15/09/04/1817214/20-chineseā¦
Since there's many fans of Chinese Android smartphones here: install a reputable anti-virus from Google Play such as Avira Mobile (free) to see if you are affected.
*It should be noted that many "security researchers" are grandstanding idiots due to conflicts of interest. Whether these ones are I do not know.
Agree, Possible solutions: