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Chaos Ransomware Upgrades With Aggressive New C++ Variant

ID: 85767270-b032-5e9c-b910-cddebec0c21e

STIX ID: report--85767270-b032-5e9c-b910-cddebec0c21e

Feed Name: Dark Reading

Threat Score
75/100

Date Published: 2025-10-09

Date Updated: 2026-05-05

Author: Elizabeth Montalbano, Contributing Writer

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Chaos ransomware has evolved into a more aggressive C++ variant that combines selective encryption with destructive deletion of very large files and a clipboard-hijacking feature that swaps copied Bitcoin addresses to an attacker-controlled Bech32 wallet; FortiGuard Labs details execution timing, file-size rules (encrypt <50MB, skip 50B–1.3GB, delete >1.3GB), clipboard manipulation via the Windows Clipboard API, AV signatures, and IoCs to aid detection and defense.

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