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Yeah, there is a trick which allows hackers to abuse your browser for this, so their logon attempts would appear to come from your location (and thus your current IP address) which kinda defeats the purpose.
The solution to that is to enable 2 factor authentication.
I viewed my account login history and the person who sent the message to my friends (through my steam account) logged in thousands of kilometers from my location.
1. Scan for malware https://www.malwarebytes.com/
2. Deauthorize all other devices https://store.steampowered.com/twofactor/manage
3. Change passwords from a clean computer
4. Generate new backup codes for your Mobile App
5. Revoke the API key https://steamcommunity.com/dev/apikey (there should be nothing in the APIKEY)
if you didnt do everything listed, someone may still have access and/or limited control over the account
Stop sharing your account credentials and your authentification code to a phishing site and things like this won't happen. This is also not a security flaw on steams end or its authentificator, both tools worked as intended.
Steam Guard mobile is just an additional independent security layer so if a user has their password and account name swiped on their PC, the hijackers still require a live phone code. It is not a full proof barrier to entry and if you give it away (which you did) with the other sensitive information, it becomes equally useless.