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Some malicious programs, and especially spyware/adware programs that have a high user visibility invest a lot of energy into preventing users from manually uninstalling them. One simple way to go about doing this is to simply not offer an uninstall program, but that s just the tip of the iceberg. Some programs go to great lengths to ensure that no one, especially no user (as opposed to a program that is specifically crafted for this purpose) can remove them. Here is an example on how this is possible under Windows. It is possible to install registry keys that instruct Windows to always launch the malware as soon as the system is started. The program can constantly monitor those keys while it is running to make sure those keys are never deleted. If they are, the program can immediately reinstate them. The way to fight this trick from the user s perspective would be to try and terminate the program and then delete the keys. In such case, the malware can use two separate processes, each monitoring the other. When one is terminated, the other immediately launches it again. This makes it quite difficult to get both of them to go away. Because both executables are always running, it becomes very difficult to remove the executable files from the hard drive (because they are locked by the operating system). Scattering copies of the malware engine throughout various components in the system such as Web browser add-ons, and the like is another approach.

Figure 17.10 Results for basic Monte Carlo simulation and simulation with antithetic sampling of mean factor of safety for Culmann single plane failure model.

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Each of these components constantly ensures that none of the others have been removed. If it has been, the damaged component is reinstalled immediately.

St. Dev. Factor of Safety for Culmann Model 0.6 0.55 Est. St. Dev. 0.5 0.45 0.4 0.35 0.3 n = 10 n = 100 Number of Simulations Basic MC Antithetic n = 1000

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Many people have said so the following, and it is becoming quite obvious: Today s malware is just the tip of the iceberg; it could be made far more destructive. In the future, malicious programs could take over computer systems at such low levels that it would be difficult to create any kind of antidote software simply because the malware would own the platform and would be able to control the antivirus program itself. Additionally, the concept of information-stealing worms could some day become a reality, allowing malware developers to steal their victim s valuable information and hold it for ransom! The following sections discuss some futuristic malware concepts and attempt to assess their destructive potential.

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Figure 17.11 Results for basic Monte Carlo simulation and simulation with antithetic sampling of standard deviation of factor of safety for Culmann single plane failure model.

Cryptography is a wonderful thing, but in some cases it can be utilized to perpetrate malicious deeds. Present-day malware doesn t really use cryptography all that much, but this could easily change. Asymmetric encryption creates new possibilities for the creation of information-stealing worms [Young]. These are programs that could potentially spread like any other worm, except that they would locate valuable data on an infected system (such as documents, databases, and so on) and steal it. The actual theft would be performed by encrypting the data using an asymmetric cipher; asymmetric ciphers are encryption algorithms that use a pair of keys. One key (the public key) is used for encrypting the data and another (the private key) is used for decrypting the data. It is not possible to obtain one key from the other. An information-stealing (or kleptographic) worm could simply embed an encryption key inside its body, and start encrypting every bit of data that appears to be valuable (certain file types that typically contain user data, and so on). By the time the end user realized what had happened, it would already be too late. There could be extremely valuable information sitting on the infected system that s as good as gone. Decryption of the data would not be possible only the attacker would have the decryption key. This would open the door to a brand-new level of malicious software attacks: attackers could actually blackmail their victims. Needless to say, actually implementing this idea is quite complicated. Probably the biggest challenge (from an attacker s perspective) would be to demand the ransom and successfully exchange the key for the ransom while maintaining full anonymity. Several theoretical approaches to these problems

are discussed in [Young], including zero-knowledge proofs that could be used to allow an attacker to prove that he or she is in possession of the decryption key without actually exposing it.

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