Anatomy of a Modern Virus Attack
1)
Basic Small Office Setup with a remote worker connecting to the Office using a Virtual Private Network Connection
Please bear in mind that there are other Vectors that could trigger a very similar attack
2)
Remote Worker gets Virus
Virus is transmitted through the Firewall as VPN User is seen as a trusted Client. PC inside Firewall is infected
3)
Virus behind the Firewall checks for update on Internet — bypasses Firewall as Communication was started Inside
Update is newer than Antivirus Definitions on Email Virus Checker
4)
Infected machine mass sends email — virus is newer than the AV Signatures so passes inspection
Simultaneously attempts to randomly infect Networked PC’s
Entire Network Compromised — creating Zombie Machines
5)
Zombie Machines regularly check with Internet for Updates and Instructions
At Virus Writer’s command machines will run code on all Zombie machines as part of a Distributed Denial of Service Attack* on the organisation of virus writer’s choosing
* A Distributed Denial of Service Attack attempts to disable or hinder a Target system by the sheer mass of requests being asked of it at once. This form of attack is almost impossible to defend against. Co-ordinated attacks against the "Root DNS Servers" on the internet almost brought down the WHOLE of the Global Internet
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