Threats Tagged 'chrysalis'

A path traversal vulnerability affecting the Windows version of WinRAR allows the attackers to execute arbitrary code by crafting malicious archive files. This vulnerability was exploited in the wild and was discovered by Anton Cherepanov, Peter Košinár, and Peter Strýček from ESET.

HighVulnerabilityBritish Indian Ocean TerritoryIndiaIndonesia+4#cve#cve-2025-8088#cwe-35

Between June and December 2025, state-sponsored threat group Lotus Blossom compromised the hosting infrastructure for Notepad++, allowing them to intercept and redirect update traffic. This enabled selective targeting of users primarily in Southeast Asian government, telecommunications and critical infrastructure sectors. Two infection chains were identified - one using Lua script injection to deliver Cobalt Strike and another using DLL side-loading for a Chrysalis backdoor. The campaign affected additional sectors across South America, US, Europe and Southeast Asia including cloud hosting, energy, financial, government, manufacturing and software development. The attack exploited insufficient verification in older versions of the Notepad++ updater to serve malicious installers to targeted victims.

MediumMalwareGermanyFranceUnited Kingdom+5#cobalt strike#chrysalis#supply chain

Rapid7 Labs has uncovered a sophisticated campaign attributed to the Chinese APT group Lotus Blossom, involving a new custom backdoor named Chrysalis. The attack compromised Notepad++ infrastructure to deliver the backdoor. Analysis revealed multiple custom loaders, including one using Microsoft Warbird for obfuscation. The Chrysalis backdoor has extensive capabilities for information gathering, file operations, and remote command execution. Additional artifacts found include Cobalt Strike beacons and Metasploit payloads. The campaign shows Lotus Blossom evolving its tactics, mixing custom and off-the-shelf tools with advanced obfuscation techniques to evade detection.

MediumMalwareGermanyFranceUnited Kingdom+5#obfuscation#apt#cobalt strike