Top 10 Malware May 2021

guest · Jun 21, 2021

Top 10 Malware May 2021
June 16, 2021
https://www.cisecurity.org/blog/top-10-malware-may-2021/

In May 2021, the MS-ISAC observed Quasar’s return to the Top 10. The Top 10 Malware variants comprise 75% of the total malware activity in May 2021, decreasing 1% from April 2021. Shlayer is likely to continue its prevalence in the Top 10 Malware for the coming quarter as more organizations move back to an in-person model. A recent patch from Apple addresses the zero-day vulnerability Shlayer used, which is likely affecting its campaign as we saw a significant decrease from the previous month.

In May 2021, malvertisement accounted for the greatest number of alerts. Malvertisement continues as the top initial infection vector due to Shlayer activity. Activity levels for dropped and malspam increased, while activity for malvertisement and multiple decreased.

Below are the Top 10 Malware ranked in order of prevalence.
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Top 10 Malware May 2021

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