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Something worth knowing is that "attribution" is extremely difficult.

Also "attribution engineering" is really quite easy and difficult to see through.

Often the purpose of a hack is not to exfiltrate data or sabotage systems but is exactly to direct blame (or sometimes distract/misdirect)

Indeed in vault 5 of Snowden's NSA leaks an "attribution engineering toolkit" was a interesting find. Malware is almost always engineered to throw forensic investigators off the scent.

That all said, I think this incident happening in US gov, in the current climate, without immediate urgent investigation is scandalous and in itself an indicator of deeper and very serious skulduggery.