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Nemesis Kitten, also tracked as PHOSPHORUS and Yellow Dev 24, is an Iran-based threat actor associated with mass scanning of internet-facing enterprise infrastructure, particularly Fortinet appliances and Microsoft Exchange servers. The actor has been observed combining broad reconnaissance and opportunistic targeting with post-compromise abuse of native administrative functionality and open-source tooling. In some intrusions, the group deployed ransomware through BitLocker rather than a bespoke encryptor, indicating a pragmatic approach that blends living-off-the-land techniques with disruptive or extortion-oriented outcomes. Reported victim geography includes organizations in the United States, Australia, the United Arab Emirates, and South Africa. The actor's activity reflects a capability set spanning internet-scale scanning, initial access against exposed systems, defense evasion through legitimate tooling, and post-exploitation actions culminating in ransomware deployment.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Geographies tied to known operations.
Attributed origin per open-source reporting.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Match sector + geo + tech-stack targeting against your real footprint.
Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.