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A stealth virus is a hidden computer virus that attacks operating system processes and averts typical anti-virus or anti-malware scans. Stealth viruses hide in files, partitions and boot sectors and are adept at deliberately avoiding detection.
Stealth virus eradication requires advanced anti-virus software or a clean system reboot.
Stealth viruses hide altered computer data and other harmful control functions in system memory and self-copy to undetectable computer areas, effectively tricking anti-virus software. In order to avoid detection, stealth viruses also self-modify in the following ways:
Brain, the first stealth virus, spread internationally during the mid-1980s.