Software that injects Trojans, viruses, worms and other malware into a computer. When run, it typically decompresses the malware components hidden within the dropper file and executes them, sometimes without saving them on disk to avoid detection. The Trojan dropper may appear to users as legitimate software that they want to install. To avoid detection, droppers may also include images and other benign data in their package. "Joiner" programs are typically used to create Trojan droppers with many files. See
Trojan and
wiretap Trojan.