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KTA529 is a threat group also known as Lotus Blossom, Spring Dragon, Billbug, and Thrip. Reporting states that between June and December 2025 the group compromised Notepad++ hosting infrastructure, enabling interception/hijacking of Notepad++ update traffic to deliver a previously undocumented backdoor named CHRYSALIS. No additional targeting, geographic attribution, or sub-group structure is provided in the available content.
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1 distinct technique observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 malware family attributed to this actor across reporting.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Compromised the Notepad++ hosting/update infrastructure (June–Dec 2025) to hijack update traffic and deliver a previously undocumented backdoor (CHRYSALIS), consistent with a supply-chain/update-channel compromise.
Compromised Notepad++ hosting/update infrastructure to perform a supply-chain style attack, intercepting update traffic to deliver the CHRYSALIS backdoor.
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Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
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