Strange guest users!!

hello,

I recently found this on my /etc/passwd, and I don't know where they come from, malicius users ?

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*

guest-ju5MVt:x:114:126:Guest,,,:/tmp/guest-ju5MVt:/bin/bash
guest-wG6ljf:x:115:127:Guest,,,:/tmp/guest-wG6ljf:/bin/bash
guest-pnnpDM:x:116:128:Guest,,,:/tmp/guest-pnnpDM:/bin/bash
guest-vDcp9d:x:117:129:Guest,,,:/tmp/guest-vDcp9d:/bin/bash
guest-VBqZ2D:x:118:130:Guest,,,:/tmp/guest-VBqZ2D:/bin/bash
whoopsie:x:119:131::/nonexistent:/bin/false
guest-57TzoY:x:120:132:Guest,,,:/tmp/guest-57TzoY:/bin/bash
guest-5Wr1lz:x:121:134:Guest,,,:/tmp/guest-5Wr1lz:/bin/bash

is there a way to prevent it if its bad ?


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