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SEABORGIUM, also known as Blue Callisto and Callisto Group, is a likely Russia-based espionage threat actor active since at least 2017. The group is primarily known for credential-phishing operations targeting government, national security, foreign policy, and academic organizations, with a particular focus on the United States, the United Kingdom, Europe, and, since 2022, Ukraine-related entities. Reported targeting has included government officials, organizations involved in national security matters, universities, a private logistics-related company in Ukraine, and an organization investigating war crimes. Interest in research institutions connected to nuclear non-proliferation has also been observed. The actor’s tradecraft centers on phishing for account credentials, often using convincing webmail or Google-themed login lures. Observed operations have included prefilled victim email fields in phishing pages, browser fingerprinting and environment checks designed to identify automated scanners or security tooling before presenting the final credential-harvesting content, and the use of phishing frameworks such as Evilginx. The group has also shown continuity in tradecraft, retaining legacy phishing techniques that have remained effective over multiple years while making incremental infrastructure and tooling changes. Observed ATT&CK-aligned behaviors include spearphishing via service, command and scripting interpreter use in client-side scripts, obfuscated or decoded content, and system information discovery through browser-side checks. Overall, SEABORGIUM is best characterized as a persistent Russian espionage actor specializing in targeted phishing, credential theft, reconnaissance of victim environments, and defensive screening of malicious infrastructure to reduce detection.
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.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
Attributed origin per open-source reporting.
10 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 malware family attributed to this actor across reporting.
14 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
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.