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M0yv is a modular x86/x64 Windows file-infector malware associated with the Maze ransomware ecosystem. It targets Portable Executable files on Windows and has been described as a file-infecting virus that can extend beyond simple parasitic infection to function as a dropper and remote access trojan. Publicly discussed source code attributed to the Maze operation indicates that M0yv formed part of that group’s broader tooling arsenal.
A notable feature of M0yv is its domain generation algorithm, which produces pseudo-random command-and-control domains from embedded seeds. Research on the malware’s DGA and subsequent sinkholing activity indicates that M0yv used algorithmically generated domains to support resilient network communications and hinder straightforward infrastructure blocking. This behavior aligns with its use as a backdoor-capable platform rather than a purely destructive or self-contained file infector.
M0yv is primarily a Windows threat and is notable for combining classic file-infection behavior with modular post-compromise functionality. High-confidence reporting links it to the Maze gang, a major ransomware operation that also developed or operated Maze, Egregor, and Sekhmet-related tooling. The malware’s role within that ecosystem suggests use in intrusion support, payload delivery, and remote control on compromised Windows systems.
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10 distinct techniques documented for this family, organized by ATT&CK tactic.
Lorsqu’un fichier infecté est exécuté, “M0yv” charge son propre code en mémoire, puis procède à l’infection d’autres exécutables présents sur la machine compromise ou accessibles via le réseau. Ce mécanisme permet au malware de se propager efficacement, notamment au sein des réseaux internes, favorisant une propagation latérale rapide.
Grâce à sa structure modulaire, le malware peut injecter des payloads supplémentaires telles que des keyloggers ou des outils de vol d’informations (infostealers), étendant considérablement son impact.
81 indicators attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.
IPs, domains, and DNS infrastructure linked to this family.
File hashes (MD5, SHA-1, SHA-256) from samples and reports.
Other indicator types observed in public reporting.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
No detailed overview is provided in the content, but M0yv is identified as a malware discussed in the weekly malware review.
A file infector malware family discussed in the context of its Domain Generation Algorithm (DGA) and sinkholing of its generated domains.
A polymorphic x86/x64 modular EPO file infector described as part of the gang's arsenal and detected in the wild as Win64/Expiro.
Modular x86/x64 polymorphic file infector malware developed by the Maze operation and used in prior attacks; its source code was leaked alongside the ransomware decryption keys.
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.