Stealth virus

What is stealth virus?
Ein Stealth-Virus ist ein versteckter Computervirus, der Betriebssystemprozesse angreift und typische Viren- oder Anti-malware-Scans verhindert. Stealth-Viren verstecken sich in Dateien, Partitionen und Boot-Sektoren und sind geschickt darin, die Entdeckung bewusst zu vermeiden.

Stealth Virus eradication requires advanced anti-virus software or a clean system restart.
Stealth viruses hide corrupted computer data and other harmful control functions in system memory and copy themselves into undetectable areas of the computer, effectively fooling antivirus software. To prevent detection, stealth viruses also modify themselves in the following ways:

Code change: The stealth virus changes the code and virus signature of every infected file.

Encryption: The stealth virus encrypts data using simple encryption and uses a different encryption key for each infected file.

Brain, the first stealth virus, spread internationally in the mid-1980s.

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Further explanations for the first letter S.