LummaC2 Malware Introduces Innovative Anti-Sandbox Technique Utilizing Trigonometry

The LummaC2 malware, also known as Lumma Stealer, has introduced a novel anti-sandbox technique that utilizes trigonometry to avoid detection and steal valuable information from infected hosts. Outpost24 security researcher Alberto Marín highlighted this method, stating that it aims to delay the activation of the malware until human mouse activity is identified.

Originally written in the C programming language, LummaC2 has been available on underground forums since December 2022. Subsequent updates have made it more resistant to analysis through techniques like control flow flattening, and it now has the capability to deliver additional payloads.

In its current iteration (v4.0), LummaC2 mandates the use of a crypter by its customers to enhance concealment and prevent the leakage of its raw form.

A significant enhancement involves the utilization of trigonometry to identify human behavior on the compromised endpoint. Marín explained that this technique observes various cursor positions within a short time frame to effectively detect human activity, thereby thwarting detonation in analysis systems that lack realistic mouse movement emulation.

To achieve this, LummaC2 captures the cursor position five times after a predefined sleep interval of 50 m

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