A security analyst is investigating a potential data exfiltration event. The analyst discovers that several large image files were recently transferred to an external server. While the images appear normal, a binary analysis reveals that the least significant bits of the pixel data across the images contain structured, non-image data. Which data hiding technique does this evidence suggest?
Steganography is the practice of concealing data within another file, such as an image. A common method, Least Significant Bit (LSB) steganography, involves altering the last bit of each pixel's color data to embed information, which matches the scenario. Alternate data streams attach hidden data to a file within the NTFS filesystem but do not alter the file's internal content. DNS tunneling exfiltrates data via DNS queries. Browser-based keylogging captures user input and is not a data hiding technique for files.
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