1. Overview

From data collected throughout 2019 and data as of June 30, 2020, we extracted information about malware, whose distribution by type is shown in Figure 1-1. Compared with 2019, the percentages of various types of malware in 2020 H1 changed, with backdoors overtaking crytominers to become No .1 with a percentage of 48.05%, and the percentage of cryptominers fell significantly. Meanwhile, worms’ activity level was basically flat on 2019. Cryptominers, worms, and backdoors together accounted for 87% of all malware activities.