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Sophisticated stealth
In addition, the use of rootkits to mask the presence of malicious code and ‘spyware’ has increased during the last 12 months or so. The term rootkit is borrowed from the Unix world, where it was used to describe tools used to maintain ‘root’ access while remaining invisible to the system administrator. Today it’s used to refer to stealth techniques employed by malware authors to hide the changes they have made to a victim’s machine. Typically, the malware author obtains access to the system by cracking a password or exploiting an application vulnerability and then uses this as ‘leverage’ to gain other system information until he achieves administrator access to the machine. Rootkits are often used to hide the presence of a Trojan, by concealing registry edits, the Trojan’s process(es) and other system activity.
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