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Umbreon is malware that provides unauthorized access to a compromised system through SSH or any other protocol that relies on PAM for authentication. The content indicates it can enable access via standard authentication facilities and can also work with its backdoor component, Espeon, to provide additional access by delivering a reverse shell when a special packet is received. High-confidence associated behavior is PAM-based authentication abuse for system access and reverse-shell capability via the related Espeon backdoor. No specific threat actor, industry targeting, infection vector, or indicators of compromise are provided in the content.
Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.
6 distinct techniques documented for this family, organized by ATT&CK tactic.
Numerous entries state malware can create a remote shell or reverse shell, for example 4H RAT, BLACKCOFFEE, DarkComet, PlugX, QuasarRAT, and others. | The content repeatedly describes threat actors and malware using cmd.exe, the Windows command shell, to execute commands, launch payloads, run batch files, and automate actions on compromised hosts.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Backdoor providing access via SSH and an additional backdoor (Espeon) that can provide a reverse shell triggered by a special packet.
Backdoor that provides access via SSH or other PAM-authenticated protocols.
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.