If you remember at Google I/O 2017 developer conference, the search giant Google announced that Android is getting official support for Kotlin Programming language. So, Kotlin has been growing at a fast pace and developers are learning Kotlin programming language with an intention to code safer and faster Android app.
https://techviral.net/wp-content/uploads/2018/01/KOTLIN-2.jpg
However, the recent reports from Trend Micro say that they have found a new malicious app which is dubbed as ANDROIDOS_BKOTKLIND.HRX. The new app is actually coded in Kotlin Programming language and it’s the first malware coded in Kotlin.

The malware was spotted in Swift Cleaner. The malware poses itself as a tool which is used for cleaning and optimization purposes. The app also recorded 1,000-5,000 installations and the malware has the capability of remote command execution, SMS sending, URL forwarding, identity theft, click-frauds.

source- https://techviral.net/first-android-malware-written-kotlin-dangerous/