sluggard,
@sluggard@infosec.exchange avatar

@jerry @support
It might be an overly broad interpretation.
Infosec.exchange is in the Emerging Threats "ET Open" ruleset (now owned by Proofpoint)
https://rules.emergingthreats.net/OPEN_download_instructions.html

infosec.exchange/@ginkgo/109436074199108459; is in emerging-malware.rules

in emerging-phishing.rules, there is this:
infosec.exchange/@rmceoin/109604157428550003

both show up in sid-msg.map

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