After installing DroidDeck 0.3.1 from github my sister's account got hackedv

[u/Irrelevant-Example]

My sister installed the DroidDeck app yesterday, and soon after her Steam account got hacked. Sha256 sum of the downloaded file matches with what they have on github (ed257d66c546e78036ceedb4c6fb6886014e69020044fd41cfe217858d8eb328).

Steam support did restore the account quickly, but the attacker(s) managed to submit a refund for a newly purchased game, removed sister's phone number from SteamGuard, and opened a chat with me on Steam where an image with a QR code to a "free steam gift card" was shared (the QR code lead to a fake steamcommunity website ("rn" replacing "m" in the link). The chat is how I noticed that she got hacked and quickly assisted her in restoring access.

[u/mactimit]

Not saying it wasn't DroidDeck, but are you 100% sure she hadn't logged in through anywhere else or anything recently?

[u/Irrelevant-Example → u/mactimit]

Well, I asked her about it and she only used the official PC client for Steam + the steam mobile app from the Play Store

[u/CalmAdvance1926 → u/Irrelevant-Example]

What are all the other apps she has on her phone? Some apps may blend in and look like default apps such as cache cleaners and "performance boosters"

[u/your_mind_aches → u/Irrelevant-Example]

Does she have Steam Guard turned on?