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GrayFish is a highly sophisticated Windows espionage platform associated with the Equation Group and regarded as the successor to EquationDrug. It is characterized by an unusually stealthy architecture that resides entirely in the Windows registry and relies on a bootkit to obtain execution during operating system startup. GrayFish has been described as the most advanced attack platform in the Equation arsenal and was deployed against new victims after earlier Equation frameworks such as EquationDrug.
The platform is designed for long-term covert access and post-compromise espionage. Its registry-resident design and boot-time execution provide strong defense-evasion and persistence properties, reducing reliance on conventional filesystem artifacts. GrayFish is part of a broader Equation ecosystem that also included EquationLaser, EquationDrug, DoubleFantasy, TripleFantasy, and Fanny, reflecting a mature, modular toolchain used for selective, high-value intrusions rather than indiscriminate mass deployment.
GrayFish has been publicly linked to the Equation Group, a threat actor widely assessed as one of the most technically capable cyber-espionage operators observed, with operations dating back to the early 2000s and possibly earlier. The malware is associated with advanced tradecraft comparable to other top-tier state-grade intrusion platforms. High-confidence reporting supports GrayFish as a Windows-focused implant platform emphasizing stealth, persistence, and post-exploitation access, but the supplied facts do not directly substantiate a fuller capability list beyond its bootkit-enabled, registry-resident operation.
Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.
1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
EquationDrug, which is still in use, dates back to 2003, although the more modern GrayFish platform is being pushed to new victims.
1 distinct technique documented for this family, organized by ATT&CK tactic.
2 indicators attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.
File hashes (MD5, SHA-1, SHA-256) from samples and reports.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Equation group implant named as part of the group's malware arsenal.
Mentioned as another malware/tool that used a similar signed-driver abuse method to load code in kernel mode.
Known Equation Group malware/platform referenced as part of prior toolsets whose cryptographic implementation was compared with the ShadowBrokers leak.
A more modern espionage platform referenced as the successor being deployed to new victims in place of EquationDrug.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.