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Effect of Anti-Virus in Computer Network: A Mathematical Model in Deterministic and Stochastic Approach

K. Chinnadurai1, S. Athithan2*

1,2Department of Mathematics, College of Engineering and Technology, SRM Institute of Science and Technologt, Kattankulathur – 603203, Tamilnadu, India

2*[email protected], 1[email protected]


A mathematical model of computer network is designed and determined both deterministic and stochastic point of view. The model exhibits two equilibria which are virus free equilibrium and endemic equilibrium. Basic reproduction number R0 is found and is used to study and predict the nature of the equilibrium points of the model.

Numerical simulation is carried to show the validity of our analytical findings both in deterministic and stochastic.

The results are also compared between deterministic and stochastic. Most of the parameters used in our model shows a significant change in the behaviour of the network, particularly anti-virus effect parameter exhibits better effect as we increase the vale of the parameter, the infected nodes gets decreases. In this manner it is good to consider our model to predict the nature of the computer networks under the assumptions of our model.


Computer Virus, Simulation, Differential Equations, Stochastic Differential Equations, Virus breeding.

1. Introduction

efficiendi. The relationship between the computer virus and anti-virus with the poverty people handling capacity depends upon the software(program) selling Price based on the product/demand but not in people Economic level. Now a days computer programmers are becoming more and more realistic based social problems [1].

Virtual virus is a handheld malicious application that contains malware, Trojan horses, parasite, and logic blast.It is a machine capable of modifying itself and targeting other machines.

And they reside by deleting records, destroying information, or altering regular operations. Since machine virus and biological virus are extremely similar [3]. This dynamic modeling of the computer virus spread process is a decisive method to identifying the behavior of computer virus.

Because, some factual estimation could be put in place to avert infection on this basis [2]. Now a days computer virus are responsible for huge economic loss. It remove data, cause system failure, etc. The PC virus started in 1980s. When real computers came in the market and then computer virus also came along with these Computer virus were small code pieces which attached to large files and systems. If we running the affected files then the virus used to get loaded into memory [6]. A broad description of the development of computer virus concealment strategies and protection mechanisms associated in anti-virus devices. To remain hidden from the anti-virus scanners, machine viruses are increasingly refining their codes to render them invisible. Anti- virus techniques, on the other side, constantly pursue the techniques and methods of viruses to defeat their risks [7]. The integration of new machines into the network and the withdrawal of outdated machines from the network shall be taken into consideration. While the machines on the wireless network are loaded with antivirus applications [8]. Metamorphic strategies are


widely used by computer virus developers to create viruses that alter their internal configuration during each infection. First, analyze four virus creation kits to determine the degree of metamorphism each provides, and to be able to quantify precisely the degree of metamorphism produced by these virus generators [11]. The above referred articles they are not used the external virus spreading devices. In this model newly we are introduces a parameter to affect the network through the external devices for example pendrive, memory card, memory stick and etc. It is a type of malicious software program that replicates itself or affecting other programs by moderate them. There are three main types of PC virus: File infectors: This type of virus affects applications contained in files. It spread once the user runs the affected file. This virus copies itself to locations on the computer where it can be accomplished and will affect files. Boot-sector virus: It is a malicious virus that affects the computer storage sector where startup files are accomplished when a computer starts. Macro virus: It affects a Microsoft Word and create a sequence of actions to be performed automatically when started. A typical virus is a introduction of some comic at certain points while writing. Macro virus also spreads as an e-mail virus. This is seem that the dynamic behavior of the purposed model is developed by a beginning R0.This paper is systematized as follows. Section 1 Introduction about the computer virus. Section 2 frame the computer virus based deterministic model Section 3 and 4 Analysis proves the local and global stability of the virus-free equilibrium and talked about the stability of the viral equilibrium are respectively. In section 5, Stochastic model. In Section 6, the numerical simulations are given to present the factualness of the theoretical results. Finally, Section 7 summarizing this work.

2. The Model Formulation and Analysis

We have planned and analyzed a non-linear model for computer virus at every time, a computer is divided as internal and external based on weather it is connected to website or not. On the time, all of the internet computers are further distinguished into three states. Based on this we considered the peoples in the age group involved in Poverty . Let N(t), I(t) and R(t) indicate their corresponding numbers on time t. N(t) is the total population of computers , I(t) is the computers are affected by the viruses and R(t) computers are made virus free and return to normal state. The SIR model is framed as follows

dS/dt = Λ - αS NI + σR - µS

dI/dt = αS NI - ξδI - (θ + µ)I (2.1 ) dR /dt = ξδI - σR - µR + θI

where N = S + I + R The model (2.1) can be simplified as follows:

dS/dt = Λ - µN

dI/dt = αS - ξδI - (θ + µ)I ( 2.2 ) dR/dt = ξδI - σR - µR + θI


Table 1. Description of parameters

Parameters Description

Λ Recruitment value µ Ordinary removal

σ Computer Networks can be susceptible again after the recovery

α Rate of Computer virus transmission (Through External devices connecting susceptible and infected )

ξ Anti-virus Inclusion and its effects δ Recovery rate due to Anti-Virus

θ Normal Recovery rate of Computer Network

Figure 1. Model Transition Diagram

a. Existence of Equilibria

The equilibrium point for this NIR model (3) has been found at, Λ - µN = 0

αS(I/N) - ξδI - (θ + µ)I = 0 ( 2.3 ) ξδI - σR - µR + θI = 0

The system (2.3) has following equilibria namely

(i)Virus free equilibrium(VFE) E0(N0; 0; 0) = (Λ/µ , 0, 0)

(ii)Endemic Equilibrium (EE) E1 ( N*,I*,R*) = (Λ/µ, Λ(σ−ξδ –( µ + θ)) 𝛼𝜇 (1+ξδ +θ

𝜎 +𝜇) , I(ξδ +θ

𝜎 +𝜇) ) 3. Stability Analysis

The variational matrix for the system (2.1) is given by J0 =

S11 0 0 S21 S22 S23

0 S32 S33

Where, S11 = -µ , S21 = αI(I+R)

N2 , S22 = (αN−2αI−𝛼𝑅

N ) − ξδ+ µ + θ , s23 = −αI

N , S32 = ξ δ + θ, S33 = -( µ+σ)


3.1 Stability analysis of Virus free equilibrium

Theorem 3.1 The Virus Free Equilibrium E0 is locally asymptotically stable provided R0 < 1.

Proof To study the stability of virus free equilibrium the variational matrix M of the system corresponding to virus free equilibrium E0 is obtained as

M1 =

−𝝁 𝟎 𝟎

𝟎 (𝜶𝑵−𝜶𝑹

𝑵 ) − 𝛏𝛅 + µ + 𝛉 𝟎

𝟎 𝛏𝛅 + 𝛉 −( 𝝁 + 𝝈)

The eigenvalues of this variational matrix are given by the roots of the following characteristic equation in λ.

λ1 = -µ , λ2 = -(µ+ 𝜎), λ3 = 𝛼 − ξδ + µ + θ .

Hence the equilibrium point E0 is locally asymptotically stable provide R0 < 1.

3.2 Stability analysis of endemic equilibrium

Theorem 3.2 The endemic equilibrium E1 is locally asymptotically stable provided the parameters of the model satisfy Routh-Hurwitz criteria for R0 > 1.

Proof The variational matrix , M2 corresponding to E1is given by M2 =

𝑆11 0 0 𝑆21 𝑆22 𝑆23

0 𝑆32 𝑆33

Where, S11 = -µ , S21 = 𝛼𝐼(𝐼+𝑅)

𝑁2 , S22 = (𝛼𝑁−2𝛼𝐼−𝛼𝑅

𝑁 ) − ξδ + µ + θ , s23 = −𝛼𝐼

𝑁 , S32 = ξ δ + θ, S33 = -( µ+σ)

The eigenvalues of this variational matrix are given by the roots of the following characteristic equation in λ1 = -µ, and 𝑆22 𝑆23

𝑆32 𝑆33 we get the quadratic equation . b1λ2 + b2λ + b3 = 0 ,

where, b2= -S22 –S33 , b3= S22 S33 – S32S23 by Routh Hurwitz criteria, roots of the quadratic equation provided R0>1.

Hence the equilibrium point E1 is locally asymptotically stable provided R0 > 1.

4. Global Stability

4.1 Global Stability of Virus Free Equilibrium

Theorem 4.1 The virus-free equilibrium E0 of model (2.3) is globally asymptotically stable when R0 ≤ 1.

Proof We prove using comparison theorem described in,


𝑹′ = 𝑭 − 𝑽 𝑹𝑰𝝀𝑯(𝑺−𝑺𝟎 𝟎) i.e., 𝑹′𝑰′ ≤ 𝑭 − 𝑽 𝑹𝑰

Since, the eigenvalues of the matrix F-V all have negative real parts, then system (2.3) is stable whenever R0 < 1. So (I,R)→(0,0) as t→ ∞. By comparison theorem, it follows that (I,R)→(0,0)


and S→𝜦

µ at t→ ∞. Then (S, I, R)→ 𝑬𝟏 𝐚𝐬 𝐭 → ∞. So, E1 is globally asymptotically stable for R0<1.

4.2 Global Stability of Virus Free Equilibrium

In order to investigate the global stability of the endemic equilibrium E1, we adopt the approach developed by [3]. Assume that R0 > 1, the E1 exists for all N, I, R >∈, for some ∈> 0.

Let 𝝀𝑯𝑁 = g( N, I, R) be positive and monotonic function in ℝ+3. V(N, I, R) = N - 𝑔(𝑁

,𝐼,𝑅) 𝑔(𝜏,𝐼,𝑅) 𝑁

𝑑𝜏 + 𝐼 − 𝐼𝑔 𝑁𝑔(𝑁,𝐼,𝜏,𝑅,𝑅)𝑑𝜏 + 𝑅 − 𝑅𝑔 𝑁𝑔 𝑁,𝐼,𝐼,𝑅,𝜏 𝑑𝜏 (4.1)

If g(N, I, R) is monotonic with respect to its variables, then the state E1 is the extremum and the global minimum of this function. So obviously


𝜕𝑁 = 1 − 𝑔 𝑁,𝐼,𝑅

𝑔(𝑁 ,𝐼,𝑅),𝜕𝑉

𝜕𝐼 = 1 − 𝑔 𝑁,𝐼,𝑅

𝑔(𝑁,𝐼 ,𝑅),𝜕𝑉

𝜕𝑅 = 1 − 𝑔 𝑁,𝐼,𝑅

𝑔(𝑁,𝐼,𝑅 ) (4.2)

Grow monotonically, then the function g(N, I, R) and h(N, I, R) have only one stationary point.

Further, since


𝜕𝑁2 = 𝑔 𝑁,𝐼,𝑅

𝑔 𝑁 ,𝐼,𝑅 2.𝑔 𝑁,𝐼,𝑅

𝜕𝑁 ,


𝜕𝐼2 = 𝑔 𝑁,𝐼,𝑅

𝑔 𝑁,𝐼 ,𝑅 2.𝑔 𝑁,𝐼 ,𝑅

𝜕𝐼 , (4.3)


𝜕𝑅2 = 𝑔 𝑁,𝐼,𝑅

𝑔 𝑁,𝐼,𝑅 2.𝑔 𝑁,𝐼,𝑅

𝜕𝑅 ,

are non-negative, then g(N, I, R) have minimum. That is, V(N, I, R) ≥ V(N*, I*, R*) and hence, V is a Lyapunov function, and its time derivative is given by


𝑑𝑡 = 𝑁 − 𝑁 𝑔 𝑁, 𝐼, 𝑅

𝑔 𝑁 , 𝐼, 𝑅 + 𝐼 − 𝐼 𝑔 𝑁, 𝐼, 𝑅

𝑔(𝑁, 𝐼 , 𝑅)+ 𝑅 − 𝑅 𝑔 𝑁, 𝐼, 𝑅 𝑔(𝑁, 𝐼, 𝑅 )

= 𝜇𝑁 1 − 𝑁

𝑁 1 − 𝑔 𝑁, 𝐼, 𝑅

𝑔 𝑁 , 𝐼, 𝑅 + 𝜇 + 𝜃 𝐼 1 − 𝐼

𝐼 1 − 𝑔 𝑁, 𝐼, 𝑅 𝑔 𝑁, 𝐼 , 𝑅

+ 𝜇 + 𝜎 𝑅 1 − 𝑅

𝑅 1 − 𝑔 𝑁, 𝐼, 𝑅 𝑔 𝑁, 𝐼, 𝑅

Since E1 > 0, the functions g(N, I, R) is concave with respect to I & R and

𝜕2𝑔(𝑁, 𝐼, 𝑅)

𝜕𝐼2 ≤ 0,𝜕2𝑔(𝑁, 𝐼, 𝑅)

𝜕𝑅2 ≤ 0 Then 𝑑𝑉

𝑑𝑡 ≤ 0 for all N, I, R > 0. The monotonicity of g(N, I, R) with respect to N, I & R ensure that

1 − 𝑁

𝑁 1 − 𝑔 𝑁, 𝐼, 𝑅

𝑔 𝑁 , 𝐼, 𝑅 ≤ 0, 1 − 𝐼

𝐼 1 − 𝑔 𝑁, 𝐼, 𝑅

𝑔 𝑁, 𝐼 , 𝑅 ≤ 0,

1 − 𝑅

𝑅 1 − 𝑔 𝑁, 𝐼, 𝑅

𝑔 𝑁, 𝐼, 𝑅 ≤ 0,


holds for all N, I, R > 0.Thus, we estabilish the following result.

Theorem 4.2 Tne endemic equilibrium E1 0f the model(2) is globally asymptotically stable whenever conditions outlined in Eq.(4.3) are satisfied.”

5. Stochastic Model

“ Here we are expanding our deterministic model to stochastic model, because stochastic model are more capable of detecting natural variations in the problem of computer viruses.

Derivation of SDE model is based on Yuvan‟s approach[4]. Let X(t) = (X1(t), X2(t), X3(t))T be a continuous random variable for (N(t), I(t), R(t))T and T denotes the transpose of a matrix. Let ∆X

= X(t+∆t) – X(t) = (∆X1,∆X2,∆X3)T denotes the random vector for the change in random variables during time interval ∆t. Here, we will write the transition maps which define all possible changes between states in the SDE model. Based on our ODE model system (2), here we see that there exist 11 possible changes between states in a small time interval ∆t. State changes and their probabilities are discussed in Table 2. Let us consider the case the recruitment of one computer network becomes susceptible / infected network. In this case, the state change ∆X is denoted by ∆X = ( 1, 0, 0 ) its probability of the change is given by prob( ∆X1, ∆X2, ∆X3 ) = ( 1, 0, 0 ) | (X1, X2, X3 ) = P1 = Λ∆t + o(∆t)

One will quickly work out the expectation change E(∆X) and its covariance matrix V(∆X) associated with ∆X by neglecting the terms higher than o(∆X). The expectation of ∆X is given by

E(∆X) = 11𝑖=1𝑃𝑖 ∆X 𝑖∆t=

𝛬 − 𝜇𝑋1

𝛼𝑋2 𝑋1−𝑋2−𝑋3

𝑋1 − 𝜉𝛿𝑋2− 𝜃 + 𝜇 𝑋2 𝜉𝛿𝑋2− 𝜎 + 𝜇 𝑋3+ 𝜃𝑋2


=𝑓(X1, X2, X3) ∆t

Here, it can be noted that the expectation vector and the function f are in the same form as those in ODE system (2.3). Since, V(∆X) = E( (∆X)(∆X)T ) – E(∆X)(E(∆X)T) and E((∆X)(

∆X)T) = f(X)f((X)T)∆t, it can be approximately diffusion matrix V times ∆t by neglecting the term of (∆t)2 such that V(∆X) ≈ E((∆X)( ∆X)T). Hence, ”

E((∆X)( ∆X)T) = 10𝑖=1𝑃𝑖( ∆X 𝑖(∆X)𝑖𝑇)∆t=

𝑉11 0 0 0 𝑉22 𝑉23 0 𝑉32 𝑉33

. ∆t = 𝛺. ∆t

Table 2. Possible changes of states and their probabilities.

Possible State Change Probability of state change

(∆X)1 = (1, 0, 0)T Changed into the affected computer network

P1 = Λ∆t+o(∆t) (∆X)2 = (-1, 0, 0)T Change into the Naturally Removed

computer network

P2 = µX1∆t+o(∆t) (∆X)3 = (0, 1, 0)T Changed into susceptible network P3 = αX2∆t+o(∆t) (∆X)4 = (0, -1, 1)T Changed into susceptible and infected

computer network P4 = α𝑋2


𝑋1∆t+o(∆t) (∆X)5 = (0, -1, 1)T Change into infected and recovery

network to the total network

P5 = αX2X3∆t+o(∆t)


(∆X)6 = (0, -1, 1)T Change into infected network to the recovery network

P6 = ξδX2∆t+o(∆t) (∆X)7 = (0, -1, 1)T Change into infected network and the

growth of recovery

P7 = θX2∆t+o(∆t) (∆X)8 = (0, -1, 0)T Changed into the network removed

depend on the infection network down rate

P8 = µX2∆t+o(∆t)

(∆X)9 = (0, 0, -1)T Changed into removed computer to susceptible by external device

P9 = σX3∆t+o(∆t) (∆X)10 = (0, 0, -1)T Changed into Natural Removed

Computer Network

P10 = µX3∆t+o(∆t) (∆X)11 = (0, 0, 0)T No Change P11 = 1 – 10𝑖=1𝑃𝑖 +o(∆t)

where the above diffusion matrix is symmetric, positive-definite and each component of this 3x3 diffusion matrix can be obtained as follows:

V11 = P1+P2, V22 = P3+P4+P5+P6+P7+P8, V33 = P6+P7+P9+P10, V23 = V32 = P6+P7, V12 = V21 = 0, V13 = V31 = 0.

We follow the approach discussed in [4, 7] and construct a matrix V = MMT, where S is a 3x6 matrix. M =

𝛬 − µ𝑋1

0 0

0 0


𝛼𝑋2 𝑋1−𝑋2−𝑋3

𝑋1 − 𝜇𝑋2


0 0 0

− 𝜉𝛿𝑋2 − 𝜃𝑋2 0

𝜉𝛿𝑋2 𝜃𝑋2 − 𝜎 + 𝜇 𝑋2

Then, the Ito stochastic differential model has the following from:

d(X(t)) = f(X1,X2,X3)dt + M.dW(t)

with initial condition X(0) = (X1(0), X2(0), X3(0))T and a Wiener Process,

W(t) = (W1(t), W2(t), W3(t), W4(t), W5(t),W6(t))T. Keeping in view of the above facts, we get the stochastic differential equation model as follows:

dN = (Λ-µN)dt + 𝛬𝑑𝑊1- µ𝑁𝑑𝑊2 dI = (𝛼𝐼(𝑁−𝐼−𝑅)

𝑁 – ξδI – (θ+µ)I)dt + 𝛼𝐼(𝑁−𝐼−𝑅)

𝑁 − µ𝐼𝑑𝑊3− 𝜉𝛿𝐼𝑑𝑊4− 𝜃𝐼𝑑𝑊5

dR = ( ξδI – σR - µR + θI )dt + 𝜉𝛿𝐼𝑑𝑊4+ 𝜃𝐼𝑑𝑊5− 𝜎 + 𝜇𝐼𝑑𝑊6 6. Numerical Simulation

“In this section, we verified our analytical results using numerical simulation.

Experimentally verified results are shown here with justification. The system (2.3) is simulated for various set of parameters satisfying the condition of local asymptotic stability of equilibria E0

and E1. To see the dynamic behaviour of the model for virus free equilibria. We consider the parameter set S1 = {Λ = 10; µ = 0.05; δ = 0.4; σ = 0.006; ξ = 0.21; α = 0.0008; θ = 0.006}, For the parameter set S1 the system (2.3) has only the virus free equilibrium and it is locally asymptotically stable (see Fig. 2).


Again for a different set of parameters S2 = {Λ = 1000; µ = 0.0145; δ = 0.000961; σ = 0.00612; ξ = 0.0051; α = 0.9912; θ = 0.0621 } For S2 the system (2.3) has feasible equilibria is the endemic equilibrium is locally asymptotically stable (see Fig. 3). To verify the stability of equilibrium with respect to the initial conditions we plotted Figs.4,5 ,6 and 7. Fig. 4 depicts the stability of endemic equilibrium point for different initial values on both total computer 14 network and computer virus affected networks. Fig. 5 depicts the stability of endemic equilibrium point for different initial values on both virus removed computer networks again goes to affected network if we change the numeric values when it is stable at different position. Fig. 6 and 7 depicts the stability of endemic equilibrium point for different initial values on both δ and ξ parameters effects are respectively. Also for a different set of parameters at 3- Dimension S3 = {Λ

= 0.2; µ = 0.001; δ = 0.03; σ = 0.03; ξ = 0.03; α = 0.01; θ = 0.31} For the system (2.3) has been feasible equilibria of 3-dimensional flow is stable at different position of each parameter in S3 the endemic equilibrium is locally asymptotically stable (see Fig. 8). Here, we simulate both deterministic and stochastic models for the following set of parameters: Λ = 01000, µ = 0.0145, δ= 0.000961, α = 0.9912, θ = 0.0621, σ = 0.051, ξ 0.00612. The simulation results for both deterministic and stochastic models are shown in Figures 9. The stochastic model (SDE model) is simulated by Euler- Maruyama method. Here, the results of stochastic model seem better than the deterministic model as the curve corresponding to computer infected network lies below the one that corresponds to the deterministic model”

Figure 2. Variation of network population under the equilibrium E0

Figure 3. Variation of network population under the endemic equilibrium E1


Figure 4. Plot of Parameter effects in α

Figure 5. Plot of Parameter effect in σ

Figure 6. Plot of Parameter Effect in δ

Figure 7. Plot of Parameter Effect in ξ


Figure 8. 3D-Plot of Computer virus network

Figure 9. SDE Vs ODE-Plot of Computer virus Network

7. Results Discussion and Conclusion

We have found the equilibrium of the model and analyzed their stabilities for the deterministic model. The deterministic model has been extended to a stochastic model to see the effect of our model as realistic one since the stochastic models were exhibiting the real world scenario. Both the deterministic and stochastic models were simulated numerically to support our analytical findings. There are figures to show the stability of our model and there are figures to


show the effectiveness of our parameters. Through our model, we found that the effect of virus transmission from outer/external sources (this parameter is known from our model as α). There are other parameters which are affecting network which makes our system susceptible after recovery, recovery due to anti-virus (as σ and ξ). We also found that anti-virus effect is to be followed on the computer network is a better advice and it is lowering down the infections on the network through computer viruses(as δ). The stability of equilibrium points of our model are plotted deterministic and as stochastically. We found that the stochastic effect also make our equilibrium points circulating very much nearer to our deterministic stable points. This confirms the convergence of our equilibrium point in deterministic and stochastic. These points were suggesting that the convergence of our model‟s equilibrium points are good and one may follow our findings for their future perspectives.


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