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NosyLogger is a C#/.NET keylogger used in the toolset of the China-aligned APT group LongNosedGoblin. ESET assessed it as a modified version of the open-source DuckSharp keylogger; specifically, reporting notes that it does not send emails or translate logged keys into the Cyrillic alphabet, unlike DuckSharp. It is used to log keystrokes, supporting credential theft and long-term monitoring of user activity. Reporting also states that it stores encrypted keystroke logs locally and checks for debuggers. LongNosedGoblin has targeted government entities in Japan and across Southeast Asia since at least 2023, and NosyLogger was observed alongside other group tooling including NosyDownloader, NosyHistorian, NosyDoor, NosyStealer, ReverseSocks5, and an argument runner. ESET reported that LongNosedGoblin likely used NosyDownloader to deploy NosyLogger. The malware is associated with cyber-espionage activity against government networks. No specific IoCs for NosyLogger are provided in the supplied content.
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1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Keylogging component used to capture keystrokes for credential theft and surveillance.
NosyLogger is a C# and .NET keylogger, likely based on DuckSharp, used for credential theft and monitoring user activity.
Keylogger based on DuckSharp, used to capture keystrokes for espionage.
Keylogger malware used to capture keystrokes from infected systems.
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Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
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Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.