APT / THREAT GROUP

FlawedAmmyy

aliases

Last seen:Mar 17, 2026

Intelligence Profile

FlawedAmmyy is a well-known Remote Access Tool (RAT) attributed to criminal gang TA505 and used to get the control of target machines. The name reminds the strong link with the leaked source code of Ammyy Admin from which it took the main structure.

Threat Analysis

FlawedAmmyy is a known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of unknown activity patterns.

External References

→https://attack.mitre.org/software/S0381/

→https://blog.intel471.com/2020/05/21/a-brief-history-of-ta505/

→https://blog.trendmicro.com/trendlabs-security-intelligence/ta505-at-it-again-variety-is-the-spice-of-servhelper-and-flawedammyy/

→https://go.crowdstrike.com/rs/281-OBQ-266/images/Report2020CrowdStrikeGlobalThreatReport.pdf

→https://habr.com/ru/company/pt/blog/475328/

Quick Facts

TypeAPT / Threat Group

Aliases2

Also Known As

win.flawedammyyFlawedAmmyy

External Intelligence

Malpedia: win.flawedammyy

Research Links

MITRE ATT&CK VirusTotal Google (news) Twitter/X search

Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.

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