Backdoor trojan example

The Trojan horse is one of the popular choices for cyber criminals. It tricks the endpoint users into downloading or opening the Trojan horse without realizing it's a threat to their cyber security.

Only a few people can recognize a Trojan at first glance. As it disguises itself as a legitimate file or program that you actually want to be on your endpoint. A Trojan horse isn't just a single type of virus.

backdoor trojan example

It also varies to its purpose. The cyber criminal can target a specific person or disseminate the Trojan horse of his choice everywhere. This list will make you understand the different types of Trojan horses and what do they do:. Backdoor It gives malicious users remote access over the infected computer. They can do whatever they want such as sending, receiving, launching and deleting files, displaying data and rebooting the endpoint.

Rootkit These are designed to hide certain objects or activities in your system. This can effectively prevent malicious programs being detected. Trojan-Banker Its purpose is to steal your account data for online banking systems, e-payment systems and credit or debit cards. Not only it can affect endpoints, but also websites. By sending multiple requests — from your computer and several other infected computers — the attack can overload the target address which leads to a denial of service.

Trojan-Downloader Trojan-Downloaders can download and install new versions of malicious programs onto your computer — including Trojans and adware.

backdoor trojan example

They are created to extort money from you. In return, they'll remove the detection and threat removal. Even though, the threats that they report are don't actually exist. Trojan-GameThief If you're into gaming, you know that online gaming can also garner loads of cash. Cyber criminals also crafted this Trojan virus which steals user account information from online gamers.

Trojan-Ransom This Trojan can change data on your endpoint. This can lead to endpoint malfunction. The cyber criminal will demand a ransom.

Trojan-Mailfinder This robs email addresses from your endpoint. We'll always preach the basic of security online. Though, that's all up to you if you'll practice safety. We're still here to guide you on further steps on how to fully stay safe from Trojan viruses.

Just follow the tips in here:. Antivirus An effective antivirus can alert you when there's a suspicious file on your endpoint. You can start using free branded antivirus offered in the Internet. A Trojan can also take a form of an antivirus, so trusting a branded antivirus can also keep you away from the danger. Up-to-date Security Software What's the use of antivirus when it's outdated? Update them when the updates are ready. It'll upgrade the software for better virus mitigation.

Avoid Malicious Websites These spread the danger among the community of Internet users. Malicious websites mostly have pop-up messages that can trick you. Better stay out of trouble. Ignore Unknown Emails When you receive an email from an unknown sender, you can just ignore them and delete them. Trojans also take the form of an email attachments.Some Trojan Horses may even give hackers access to your personal information.

Read on to learn about the most common types of Trojan Horses and the safest ways to remove them from your computer. What you will find out in this article:. Take a look at our comparison of the best antivirus software to keep your computer safe from cyber threats.

FounderSoftwareLab. Some 33 centuries ago, the ancient Greeks constructed a giant wooden horse and gave it to the Trojans as a gift of peace. Hiding inside the Trojan horse were Greek warriors, who tricked the Trojans into giving them access to the city and went on to take control of it.

Underneath, however, they are waiting for an opportunity to take control of your computer. In cybersecurity terms, a Trojan horse is a piece of malware that can damage, steal, or otherwise harm your data or your computer network. Often referred to simply as a Trojan, this malicious software is usually disguised as a legitimate computer program. Once downloaded and installed on your system, it allows hackers to spy on your online activity, access and copy files from your hard drive, modify and delete your data, hamper the performance of your computer, and even steal your personal information.

Trojan horses first appeared as non-malicious software back in the mids and have gone through numerous stages of development since. In the late eighties, the first-ever type of ransomware was the so-called AIDS Trojan distributed on floppy discs. During the early s, Trojans have evolved to allow their creators to take full control of the infected computer using the remote administration technology.

Nowadays, Trojan horses are distributed the same way as most other types of malware. While viruses can self-execute and self-replicate, Trojans cannot do that.

Instead, the user has to execute a Trojan themselves by launching the program or installation that the Trojan is bundled with. There are many types of Trojan horses in circulation, some of them more harmful than the others.

Thankfully, most of them are routinely detected and removed by the best antivirus software. According to various statistics, Trojans account for anywhere between 25 and 80 percent of all malware infections around the world.A backdoor is a malicious computer program that is used to provide the attacker with unauthorized remote access to a compromised PC system by exploiting security vulnerabilities.

A Backdoor works in the background and hides from the user. It is very similar to other malware viruses and, therefore, it is quite difficult to detect. A backdoor is one of the most dangerous parasite types, as it allows hackers to perform any possible actions on a compromised computer. Quite often, a backdoor has additional destructive capabilities, such as keystroke logging, screenshot capture, file infection, andencryption.

Most backdoors are malicious programs that must be somehow installed to a computer. Nevertheless, some parasites do not require the installation, as their files are already integrated into software that is running on a remote host. Programmers sometimes leave such backdoors in their software for diagnostics and troubleshooting purposes.

However, hackers use these flaws to break into the system. Generally speaking, backdoors are specific trojans, viruses, keyloggers, spyware and remote administration tools. They work in the same manner as mentioned viral applications do. However, their functions and payload are much more complex and dangerous, so they are grouped into one particular category.

The most of such parasites must be manually installed in a bundle with other software.

Backdoor Attack

There are four major ways how these threats get into the system. Widely spread backdoors affect mostly computers running the Microsoft Windows operating system. However, lots of less prevalent parasites are designed to work in different environments, like macOS and Linux.

Phishing Example

A backdoor allows the attacker to work with an infected computer as with its own PC and use it for various malicious purposes or even criminal activities. In most of the cases, it is really hard to find out who is controlling the parasite. In fact, all backdoors are very difficult to detect. They can violate user privacy for months and even years until the user will notice them. Backroods can be used to install other malicious software, such as ransomware or coin mining malware.

Furthermore, backdoors can be used for destructive purposes. If the hacker was unable to obtain any valuable and useful information from an infected computer or have already stolen it, he eventually may destroy the entire system in order to wipe out his tracks. This means that all hard disks would be formatted and all the files on them would be unrecoverably erased. There are lots of different backdoors. The following examples illustrate how functional, and extremely dangerous these parasites can be.

The parasite decreases overall system security by changing the default Windows firewall settings and initiating other system changes. The backdoor automatically runs on every Windows startup, and it can be stopped only with the help of updated anti-spyware. FinSpy malware is a controversial spyware tool that is usually installed by bypassing security flaws within systems.

Tixanbot is an extremely dangerous backdoor that gives the remote attacker full unauthorized access to a compromised computer.A Trojan horse, or Trojan, is a type of malicious code or software that looks legitimate but can take control of your computer.

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A Trojan is designed to damage, disrupt, steal, or in general inflict some other harmful action on your data or network. A Trojan acts like a bona fide application or file to trick you. It seeks to deceive you into loading and executing the malware on your device. Once installed, a Trojan can perform the action it was designed for. Viruses can execute and replicate themselves. A Trojan cannot. A user has to execute Trojans. Even so, Trojan malware and Trojan virus are often used interchangeably.

The email is from a cybercriminal, and the file you clicked on — and downloaded and opened — has gone on to install malware on your device. It varies. Trojans are designed to do different things. It lets an attacker access your computer and control it.

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Your data can be downloaded by a third party and stolen. Or more malware can be uploaded to your device. This Trojan performs DDoS attacks. The idea is to take down a network by flooding it with traffic. That traffic comes from your infected computer and others. This Trojan targets your already-infected computer. It downloads and installs new versions of malicious programs.

These can include Trojans and adware. This Trojan seeks a ransom to undo damage it has done to your computer. This Trojan can give an attacker full control over your computer via a remote network connection. Its uses include stealing your information or spying on you. A rootkit aims to hide or obscure an object on your infected computer.

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The idea? To extend the time a malicious program runs on your device. This type of Trojan infects your mobile device and can send and intercept text messages. Texts to premium-rate numbers can drive up your phone costs.

This Trojan takes aim at your financial accounts. That includes banking, credit card, and bill pay data. Trojan malware attacks can inflict a lot of damage. At the same time, Trojans continue to evolve. Here are three examples. They can also impact your mobile devices, including cell phones and tablets. In general, a Trojan comes attached to what looks like a legitimate program. In reality, it is a fake version of the app, loaded up with malware.

In addition, these apps can also steal information from your device, and generate revenue by sending premium SMS texts.

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One form of Trojan malware has targeted Android devices specifically.As a result, remote access is granted to resources within an application, such as databases and file servers, giving perpetrators the ability to remotely issue system commands and update malware. Backdoor installation is achieved by taking advantage of vulnerable components in a web application. Once installed, detection is difficult as files tend to be highly obfuscated.

In an RFI scenario, the referencing function is tricked into downloading a backdoor trojan from a remote host. Example of a backdoor dashboard with command execute capabilities. Perpetrators typically identify targets using scanners, which locate websites having unpatched or outdated components that enable file injection.

A successful scanner then abuses the vulnerability to install the backdoor on the underlying server. Once installed, it can be accessed at any time, even if the vulnerability enabling its injection has since been patched. Backdoor trojan injection is often done in a two-step process to bypass security rules preventing the upload of files above a certain size. The first phase involves installation of a dropper—a small file whose sole function is to retrieve a bigger file from a remote location.

It initiates the second phase—the downloading and installation of the backdoor script on the server. Once installed, backdoors are very hard to weed out.

Traditionally, detection involves using software scanners to search for known malware signatures in a server file system. This process is error prone, however.

backdoor trojan example

Detection is further complicated since many applications are built on external frameworks that use third-party plugins; these are sometimes laden with vulnerabilities or built-in backdoors. Scanners that rely on heuristic and signature-based rules might not be able to detect hidden code in such frameworks. Even if a backdoor is detected, typical mitigation methods or even a system reinstallation are unlikely to remove it from an application.

This is particularly true for backdoors having a persistent presence in rewritable memory. At Imperva, we use a combination of methods to prevent backdoor installation, as well as to detect and quarantine existing backdoor shells.

As a result, your site is secured from the moment you onboard our service. The solution takes the novel approach of intercepting connection requests to malicious shells—a preferable alternative to scanning a server for backdoor files. Unlike backdoor files, which are easily hidden, connection requests cannot be obfuscated to hide their malicious intent. By tracing back such communication attempts, the Imperva cloud service can identify any backdoor shell, even if its source code was encrypted to avoid scanners.

Search Learning Center for. Backdoor Attack AppSecThreats.Not every case of a successful intrusion is "crowned" with a replaced Web site on the server, data theft or damage. Often electronic intruders do not wish to create a spectacle but prefer to avoid fame by hiding their presence on compromised systems, sometimes leaving certain unexpected things.

backdoor trojan example

They use sophisticated techniques to install specific "malware" backdoors to let them in again later with full control and in secret. Obviously, hackers have a variety of motives for installing malevolent software malware.

These types of software tend to yield instant access to the system to continuously steal various types of information from it - for example, strategic company's designs or numbers of credit cards.

In some cases, they use compromised machines as launch points for massive Denial of Service attacks. Perhaps the most common reason hackers tend to settle on another system is the possibility of creating launch pads that attack other computers while disguised as innocent computer addresses.

This is a certain kind of spoofing where the intrusion logs fool the target system into believing that it is communicating with another, legitimate computer rather than that of an intruder. Under normal conditions, it is hardly to compromise LAN security from the Internet, because in most cases LANs are tied to the Internet via reserved addresses such as type Thus, a hacker cannot have direct access from the Internet, which presents a certain problem for him.

Installing shell programs e. Telnet on any Internet-accessible computer will allow the intruder to gain access to the LAN and spread his control over the infrastructure. Such types of attacks are prevalent on Unix computers, because they use more common remote access shell services SSH, or more rarely, Telnet and no additional installation is required.

This article will, however, focus on Microsoft Windows-based systems. An intelligent hacker will not try to put his program on a server that is monitored and checked regularly. He will secretly, without the knowledge of any legitimate user. Therefore, his attempts to get in will certainly not be through the main domain controller which has its log frequently examined, network traffic monitored and will detect any alterations immediately.

Of course, everything depends on the observance of the security policy and as is well known, network administrators are not always scrupulous in performing their work. Nevertheless, a host that plays no key role in the network makes a perfect target for a hacker. Before commencing the selection process, a successful hacker tends to transfer the zone and thereafter identify probable roles of individual hosts within a domain by deducing the knowledge from their names.Trojans appear to contain benign or useful functionality, but also contain code paths that are hidden from normal operation that violate the intended security policies of the user or system administrator.

The technical impact, would be to execute unauthorized code or commands on the victims machine. As we look through the PE File format. We are searching for corrupted data. Corruption from a memory dump will be highlighted in red. The GIF below verifies the no red policy.

This tells us we have a complete sample for analysis. This should theoretically make analysis easier. Depending on if its packed, protected, encrypted or armed. We know one thing is true, we will not have to rebuild a memory dumped file and this is great news:. Windows GUI applications need to register a windows class before creating a graphical window. The windows procedure processes messages sent to a window. Here we can see the code path of the Windows Procedure:.

The hardest part of analyzing any Trojan is finding the hidden Call or Pointer to the malware code. Looking up at the window procedures picture above.

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After stepping through the application and setting your favorite breakpoints you will arrive to an encrypted code cave:. The code caves instructions will cycle through the decryption loop, its only one while loop. However, its nested deep inside the sample:.

The Different Examples of a Trojan Horse

The largest section of the decryption logic places many xor and shift operations on the encrypted code cave to decode the encrypted buffers data:. Malware Logic:. Stepping into the code caves buffer and following the logic. You will see the following instructions:. The instructions above, show the starting area of the malware architects logic. We can see the whole payload here:. API Hashes:. Systems Supported By This Trojan:.

Lets turn back to the APIs listed above and pick out a few to talk about and see if we can understand a summary of what this sample is doing:. The processes it drops and executes provides the malware components to be modular in design. Such as the key-logging and remote viewing capabilities. Project "Androm" Backdoor Trojan February 8, We know one thing is true, we will not have to rebuild a memory dumped file and this is great news: Metadata:. After stepping through the application and setting your favorite breakpoints you will arrive to an encrypted code cave: The code caves instructions will cycle through the decryption loop, its only one while loop.

However, its nested deep inside the sample: The largest section of the decryption logic places many xor and shift operations on the encrypted code cave to decode the encrypted buffers data: Once the data has been decrypted, you will see the following decoded code cave:. You will see the following instructions: The instructions above, show the starting area of the malware architects logic.

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