Threats Tagged 'string obfuscation'
View all threats tagged with 'string obfuscation'. Filter and sort to focus on specific types of threats.
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Threats Tagged 'string obfuscation'
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Vidar is an information-stealing malware first identified in 2018 that has progressively enhanced its string obfuscation methods to avoid detection and analysis. From May to September 2026, it evolved from simple XOR encryption to using ChaCha20-based algorithms and then implemented a custom virtual machine (VM) with a lightweight bytecode interpreter and custom stream ciphers that vary per build. The VM uses 14 opcode handlers with basic operations such as XOR, addition, rotation, and substitution. Version 2.0 introduced the VM, and versions 2.2 and later added ARX-based custom stream ciphers using FNV-1a hashing and golden ratio constants. These per-build changes in opcodes, constants, and substitution tables complicate static and automated analysis efforts. Join the discussion | AlienVault OTX General | 09/21/2026, 16:45:51 UTC Added: 09/22/2026, 08:02:57 UTC |
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