- For anyone who, like me, wasn't sure what's going on in the linked, archived PR: this is Mythos attempting to socially engineer a malicious PR during a test run by the UK AI Safety Institute.
AISI has published a report about the incident which was preciously discussed on HN: https://news.ycombinator.com/item?id=49175717
- Working with maintainers (on the GitHub side) there’s definitely been a rise of malware dropper attacks against popular OSS repos, though this is particularly brazen - pressure tactics and all.
- Actual details on the incident: https://github.com/w1b/aisi-mythos-inc-2026-07-28-01-recover...
Both the attacker and the target account are very similar and look fake/bots.
- yeah, this being one component of what was being discussed in the aisi writeup here: https://cdn.prod.website-files.com/663bd486c5e4c81588db7a1d/...
- Not going to comment on the PR commentary, but the victim GitHub account is suspicious itself, recent account, a few fresh repos, following 14.5k others, and I count three surnames on the account (the username, plus two in the README history).
- I saw a contribution by this maintainer to another user who ALSO HAS 14.5k followers: https://github.com/yumiaura/myCat/pull/99 "yumiaura" and a preference for "my[APPNAME]" repo naming.
What is this?
Are the histories that Github presents all derived from someone's uploaded git repo .. e.g. can I simply claim to have created a GIT repo in 1970, and the "github commit graph" will dutifully represent this claim in its green-colored activity graph?
- They're almost certainly not genuine accounts, maybe used for phishing or social engineering?
- What does this malware do? Who operates it?
