Defender evasion: assessing and improving detections
Published on April 19, 2025, the article describes a two-part series on Windows Defender evasion, including direct syscalls and XOR. Part one provides basic experimental code and points to defensive uses in evaluating antivirus defenses and improving detections.
Source: Técnicas para Bypassar o Windows Defender: Direct Syscalls e XOR (hackmosphere.fr). Text prepared with AI from this source.
What happened and what to do
Published on April 19, 2025, the article describes a two-part series covering how antivirus works, setting up a lab, and techniques intended to bypass Windows Defender using direct syscalls and XOR. Part one provides basic code for experimentation. The article notes that understanding these techniques can help security teams assess antivirus defenses and develop better detections.
A practical response is to test detection capabilities in an isolated, authorized lab, record relevant events, and track whether security rules identify the behaviors under evaluation. A company could implement collection and monitoring for these signals, dashboards for detection coverage, and a process to review and update detections, without running experiments on production systems.
How the consultancy can help
Wendelmaques can diagnose exposure and monitoring gaps, define the scope of defensive testing in a controlled environment, and implement event collection, dashboards, and a process for detection review and operation.
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