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Lotus Blossom Hacking Group Exploits Notepad++ Hosting Breach to Deploy Chrysalis Backdoor

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1 unique sources, 1 articles

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The China-linked Lotus Blossom hacking group exploited a hosting provider breach to deliver a previously undocumented backdoor, Chrysalis, to Notepad++ users. The attack, which occurred between June and December 2025, involved hijacking update traffic and exploiting insufficient update verification controls in older versions of the software. The group used a multi-layered shellcode loader and integrated undocumented system calls to enhance stealth and resilience. The breach was discovered and mitigated in December 2025, with Notepad++ migrating to a new hosting provider and rotating all credentials. The Chrysalis backdoor is a feature-rich implant capable of gathering system information, executing commands, and maintaining persistence. It communicates with a command-and-control (C2) server to receive additional instructions. The C2 server is currently offline, but the malware's capabilities suggest ongoing development and adaptation by the threat actor.

Timeline

  1. 03.02.2026 06:55 1 articles · 20h ago

    Lotus Blossom Hacking Group Exploits Notepad++ Hosting Breach to Deploy Chrysalis Backdoor

    The China-linked Lotus Blossom hacking group exploited a hosting provider breach to deliver a previously undocumented backdoor, Chrysalis, to Notepad++ users. The attack, which occurred between June and December 2025, involved hijacking update traffic and exploiting insufficient update verification controls in older versions of the software. The group used a multi-layered shellcode loader and integrated undocumented system calls to enhance stealth and resilience. The breach was discovered and mitigated in December 2025, with Notepad++ migrating to a new hosting provider and rotating all credentials. The Chrysalis backdoor is a feature-rich implant capable of gathering system information, executing commands, and maintaining persistence. It communicates with a command-and-control (C2) server to receive additional instructions. The C2 server is currently offline, but the malware's capabilities suggest ongoing development and adaptation by the threat actor.

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