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Mastering Kali Linux for Advanced Penetration Testing by Robert W. Beggs

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Using persistent agents

Traditionally, attackers would place a backdoor on a compromised system—if the front door provided authorized access to legitimate users, the backdoor applications allowed attackers to return to an exploited system and access to services and data.

Unfortunately, the classical backdoors provided limited interactivity and were not designed to be persistent on the compromised systems for very long time frames. This was viewed as a significant shortcoming by the attacker community, because once the backdoor was discovered and removed, there was additional work required to repeat the compromise steps and exploit the system, which was made more difficult by the forewarned system administrators defending the network and its resources. ...

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