The Trojan Horse Malware Effects On Computers

Updated on October 21, 2022, by Xcitium

Trojan Horse Malware Effects

What Are the Effects of Trojan Horse Malware?

Trojan horse malware can steal sensitive information, provide attackers with unauthorized access, install additional malware, disable security software, and disrupt normal system operations. Unlike viruses, Trojans do not self-replicate. Instead, they rely on users to unknowingly install them by disguising themselves as legitimate software or files. Once installed, they can compromise personal data, financial information, and business systems.

How Trojan Horse Malware Affects a Computer

A Trojan typically follows these stages:

Tricks the user into downloading or opening a malicious file.
Installs itself silently on the device.
Establishes communication with an attacker-controlled server.
Executes malicious commands such as data theft or malware installation.
Maintains persistence to survive reboots.
Attempts to avoid detection by security software.

Early detection helps minimize the damage caused by Trojan infections.

Named after the giant wooden horse the Grecian army used to mount a surprise attack inside Troy during the Trojan War, a trojan horse virus exists to provide a backdoor for malware or for hackers into a system. Trojan horse virus authors engineer them in such a way that they show up as harmless, convenient, and useful programs. This way makes users unintentionally install these dangerous programs on their computers and introduce Trojan horse malware effects into the system.

The Trojan horse virus gathers passwords and personal Trojan horse virus gathers passwords and personal information for as long as 200 days if left undetected.. When the hackers gain the data, they use all of the stolen information in several ways. They sell it to the black market, steal bank account access, or ask for ransom.

In 2016, the highest distribution of malware infections was the Trojan horse virus. During the last quarter of 2016, 74.99% of malware infections were trojans. This shows how effective Trojan horse viruses in tricking users to install them.

Distribution of malware infections of desktop PCs worldwide as of 4th quarter 2016, by type.

The Different Trojan Horse Malware Effects

Keyloggers keep a record of anything users sort on their keyboard. It’ll eventually secure passwords and usernames on any accounts they logged within. Cybercriminals will be able to compromise all their accounts which can result in identity theft. Identity theft can harm their accounts, their reputations, and, most of all, their lives. Cybercriminals can use their bank accounts to buy products or even blackmail any person.

Manipulation of Requests

Cybercriminals complete their attack through the use of a Trojan horse virus. When cybercriminals successfully acquire users’ bank account details, they can manipulate the total amount and destination account while they confirm and encode details of the transaction. This won’t even be a noticeable Trojan horse malware effect.

Turning Endpoints into Zombies

Cybercriminals might not want anything except enriching themselves through network resources. However, Distributed-Denial-of-Service (DDOS) is a rampant attack to flood the victim server with thousands of traffic connections until it is incapable to handle the load and goes offline. When this is detected, the hosting site will be forced to disable due to security features, but that doesn’t mean they purchased millions of computers just to conduct the attack. It’s actually a strategic plan since they’re using other computers that won’t lead to them and who won’t lead to their real IP addresses.

Victims Lose Control Over Their Computers

The Trojan-DDoS can start up the Denial of Service (DoS) attacks. Not only it can affect endpoints, but also websites. By sending multiple requests – from an endpoint and several other infected computers – the attack can overload the target address which leads to a denial of service.

Hence, the end user loses his/her control over his/her endpoint. The user’s endpoint becomes an accessory to a cybercrime he/she didn’t want in the first place.

Undetectable Trojan Horse Virus

Ordinary antivirus can’t detect sophisticated Trojan horse virus. Due to its deceitful characteristics, it can hide its activity from the Task Manager. A Rootkit Trojan may be able to subvert the software that is expected to find it (e.g. antivirus). The removal of a Rootkit Trojan can be difficult or practically impossible. Most especially in cases where the rootkit stays in the kernel, reinstallation of the operating system may be the only way to resolve the problem.

Common Effects of Trojan Horse Malware

Effect	Impact
Credential Theft	Steals usernames and passwords
Financial Fraud	Captures banking and payment information
Data Breach	Exposes confidential business or personal data
Remote Access	Allows attackers to control the infected device
Malware Download	Installs ransomware, spyware, or additional Trojans
System Instability	Causes crashes and reduced performance
Security Bypass	Disables antivirus or endpoint protection
Network Compromise	Enables attackers to move laterally within networks

Understanding these effects highlights why Trojans remain a serious cybersecurity threat.

The Qualities that AEP Serves to Eliminate Trojan Horse Malware Effects

Host Intrusion Prevention System Basic

HIPS represents a preemptive approach to network security and utilizes advanced techniques to detect and block attempts to breach a computer system. It utilizes several advanced techniques to scan network traffic and look for patterns in the data. If a possible breach is discovered, HIPS can take several different defensive actions depending on the type and severity of the detected Trojan Horse malware effects. Defensive actions can include alerting the user and/or administrator and automatically dropping suspicious data streams.

Machine Learning Through The Artificial Intelligence

Machine learning is a vast and ever-changing field, and Xcitium uses the latest machine learning techniques to determine to determine if a file is malicious or benign. Xcitium has created a predictive model started with collecting a huge number and variety of malicious and benign files. Features are extracted from files along with the files’ label (e.g. good or bad). Finally, the model is trained by feeding all of these features to it and allowing it to crunch the numbers and find patterns and clusters in the data. When the features of a file with an unknown label are presented to the model, it can return a confidence score of how similar these features are to those of the malicious and benign sets. That effectively defends the endpoints from the Trojan Horse malware effects. These concepts underpin VirusScope, Xcitium’s file and behavioral analysis engine residing on the local client.

AEP Self Protection

As Xcitium Advanced Endpoint Protection (AEP) protects your endpoints against trojan horse malware effects, the AEP application itself routinely comes under attack by malicious applications trying to circumvent its protection. Fortunately, Xcitium AEP includes robust self-protection countermeasures that prevent malicious applications from gaining control or circumventing Xcitium AEP services.

Endpoint Application Control

There are multiple routes for an unknown code to execute on a host CPU, and Application Control provides a key tool in controlling trojan horse malware effects. Application Control provided by Xcitium Advanced Endpoint Protection (AEP) blocks unauthorized executables on servers, corporate desktops, and fixed-function devices. Using a dynamic trust model and innovative security features such as local and global reputation intelligence, real-time behavioral analytics, and auto-immunization of endpoints, it immediately thwarts advanced persistent threats—without requiring labor-intensive list management or signature updates.

Combining Endpoint Protection Platform (EPP) and Endpoint Detection Response (EDR)

Xcitium Advanced Endpoint Protection (AEP) combines both superior prevention with the ability to detect/respond to threats as they emerge. Xcitium AEP goes beyond prevention provided by conventional signature-based detection and AV. Xcitium AEP includes multiple preventative capabilities including AV, HIPS, ongoing Artificial Intelligence/Machine Learning monitoring and layers on the ability to manage and monitor endpoints to quickly resolve issues. Advanced Endpoint Protection provides deep visibility into file activity on your endpoints, detecting malicious behavior that other security solutions may miss, and provides you the control investigate, contain and remediate your entire endpoint environment.

If there will be an instance that a Trojan horse virus will get through the containerization technology, Xcitium AEP can respond immediately when this happens. It tracks any malicious activities that are not supposed to occur while the endpoint environment is in use or idle.

Warning Signs of Trojan Malware

A computer infected with a Trojan may show:

Slow system performance
Frequent crashes or freezing
Unexpected pop-up messages
Unknown applications or processes
Browser redirects
Unusual network traffic
Disabled security software
Unauthorized account activity
Missing or modified files

Some advanced Trojans remain hidden, making continuous endpoint monitoring essential.

Trojan Horse Malware vs Virus

Trojan Horse vs Computer Virus

Trojan Horse	Computer Virus
Disguises itself as legitimate software	Attaches to legitimate files
Requires user interaction for installation	Replicates by infecting files
Does not self-replicate	Self-replicates
Often creates backdoors	Primarily spreads and infects files
Frequently steals data	Often corrupts or damages files

Although both are malware, their behavior and attack methods differ significantly.

Why Trojan Horse Malware Is Dangerous for Businesses

Trojan infections can result in:

Data breaches
Financial losses
Credential theft
Business email compromise
Regulatory penalties
Operational downtime
Intellectual property theft
Reputation damage

Organizations should implement layered security controls to reduce these risks.

How Trojan Horse Malware Spreads

Common Infection Methods

Trojans commonly spread through:

Phishing emails
Malicious attachments
Fake software downloads
Cracked software
Compromised websites
Fake software updates
Social engineering attacks
USB devices

Recognizing these delivery methods helps users avoid infection.

Best Practices to Prevent Trojan Infections

Reduce your risk by:

Downloading software only from trusted sources.
Keeping operating systems and applications updated.
Using advanced endpoint protection.
Enabling Multi-Factor Authentication (MFA).
Avoiding suspicious email attachments and links.
Performing regular malware scans.
Restricting administrative privileges.
Implementing Zero Trust security principles.
Training employees to recognize phishing attacks.

Preventive security measures are far more effective than recovering after an infection.

Example: Trojan Horse Attack

An employee downloads what appears to be a free productivity tool.

Hidden inside the installer is a Trojan that:

Installs silently.
Opens a backdoor.
Steals saved browser passwords.
Downloads additional malware.
Sends confidential business information to an attacker.

Behavior-based endpoint protection detects the suspicious activity, blocks the Trojan, and isolates the affected device before additional damage occurs.

Trojan Horse Attack Lifecycle

Lifecycle content increases topical depth.

Trojan Horse Attack Lifecycle

Stage	Activity
Delivery	Trojan arrives through phishing, downloads, or compromised websites
Installation	User executes the malicious file
Persistence	Trojan establishes long-term access
Command and Control	Connects to attacker infrastructure
Malicious Actions	Steals data, installs malware, or enables remote access
Detection and Response	Security tools identify and contain the threat

Understanding this lifecycle helps organizations strengthen detection and response strategies.

Trojan Horse Prevention Checklist

Security Best Practices

Best Practice	Benefit
Endpoint Protection	Blocks Trojan execution
Email Security	Stops phishing attacks
Multi-Factor Authentication	Protects user accounts
Patch Management	Reduces exploitable vulnerabilities
Application Allowlisting	Prevents unauthorized software
Security Awareness Training	Lowers social engineering success
Continuous Monitoring	Detects suspicious activity early

Xcitium AEP: Trojan Horse Malware Effects Remover

Cybersecurity experts encourage enterprises to choose an endpoint protection that has a superb disaster prevention. It promotes a healthy working environment for the whole enterprise as the employees and clients are at peace when doing business. Xcitium Advanced Endpoint Protection defends the endpoint environment from Trojan horse malware effects. It is the next-generation cyber security system that blocks bad files and automatically contains unknown files in a virtual container using Default Deny Platform™ and containerization technology. The unknown “contained” file is analyzed and an accelerated verdict is obtained through the Valkyrie cloud-based advanced malware analysis platform. It gives you the trojan horse virus protection.

Xcitium Advanced Endpoint Protection gives a lightweight, scalable Default Deny Platform with a unique endpoint security approach. This results in complete protection and enterprise visibility. The app-based platform removes the difficulty in using and solving the issues. Provisioned in minutes, Advanced Endpoint Protection also contains unified IT and security management console, that through an app-enabled platform reduces the effort of managing your Android, iOS, OSX, Linux, and Windows devices, on every segment of your physical and virtual networks.

Experience the optimal endpoint environment using Xcitium AEP! Sign-up for the 30-day free trial now!

Frequently Asked Questions About Trojan Horse Malware Effects

What are the effects of Trojan horse malware?

Trojan horse malware can steal sensitive information, install additional malware, enable unauthorized remote access, disable security software, and reduce system performance.

Can a Trojan horse steal passwords?

Yes. Many Trojans include credential-stealing capabilities that capture usernames, passwords, browser cookies, and financial information.

How does Trojan horse malware infect a computer?

Trojans typically spread through phishing emails, malicious downloads, fake software updates, compromised websites, or social engineering attacks that trick users into installing them.

Can antivirus detect Trojan horse malware?

Modern endpoint security solutions use signatures, behavioral analysis, AI, and threat intelligence to detect and block both known and unknown Trojans.

What should I do if my computer has a Trojan?

Disconnect the device from sensitive networks if necessary, run a full malware scan with trusted security software, remove or quarantine detected threats, update your system, change important passwords after confirming the device is clean, and monitor for suspicious activity.

How can businesses protect against Trojan horse attacks?

Businesses should implement endpoint protection, Zero Trust security, Multi-Factor Authentication, employee security awareness training, application control, and continuous monitoring to reduce the risk of Trojan infections.

Discover Malware for Free