The ultimate guide to privacy protection. Stop infections before they happen. Find the right solution for you. Featured Event: RSA Trojans are programs that claim to perform one function but actually do another, typically malicious. Cybersecurity Basics.
Trojan horse — Virus or malware? For Home View all Malwarebytes products. Trojan soldiers watch as the Greeks appear to sail away, leaving behind a giant wooden horse as a token of surrender. Drunk on victory, the Trojans bring the horse inside their walls, only to discover Odysseus and his men were hidden inside the whole time. While technically they are not computer viruses but rather a separate form of malware, "Trojan horse virus" has become a common way to refer to them.
People sometimes think of a Trojan as a virus or a worm, but it is really neither. A virus is a file infector which can self-replicate and spread by attaching itself to another program. Most viruses are now seen as legacy threats. Worms have also become rare, though they do pop up from time to time.
Think of Trojans as an umbrella term for malware delivery, because there are various kinds of Trojans. Put another way, a Trojan is a delivery strategy that hackers use to deliver any number of threats, from ransomware that immediately demands money, to spyware that conceals itself while it steals valuable information like personal and financial data.
Keep in mind that adware or PUPs potentially unwanted programs can be confused with Trojans because the delivery method is similar.
For example, sometimes adware sneaks onto your computer as part of a bundle of software. The program authors usually include the adware for marketing affiliate reasons so they can monetize their installer with offers—usually clearly labeled. Such adware bundlers are typically less malicious than Trojans.
Also, they do not conceal themselves as Trojans do. But since the adware distribution vector resembles that of a Trojan, it can cause confusion. Trojans can look like just about anything, from free software and music, to browser advertisements to seemingly legitimate apps. Any number of unwise user behaviors can lead to a Trojan infection.
Here are a few examples:. It presented itself as a simple game along the lines of twenty questions. However, behind the scenes, the game copied itself onto shared directories where other users could find it.
Unfortunately, you cannot easily remove ". It's built into the operating system itself. Happily, the ". Remember, the system searches for commands starting from the beginning of your path, running the first matching program that it finds.
Still, mistyping a command name could lead to a privilege escalation attack on a Windows system, so be careful when typing commands with an account with administrator privileges.
So, in light of these deviously named Trojan horses, what can we do to defend ourselves? First, we must keep the malicious code off of our systems in the first place by employing the antivirus tools described in Chapter 2 and the backdoor defenses described in Chapter 5.
Also, you should be ready to kill suspicious processes that usurp the names of legitimate processes. PsKill can shut down any running process, regardless of its name. However, be careful with this tool!
If you shut down a legitimate process, you could cause your system to be unstable or even create an instant crash. Therefore, you need to research each process of concern in more detail before shutting it down.
To conduct this research, you can use some tools we initially discussed in Chapter 5. Remember our good friends, Lsof and Fport? As you might recall, Fport, run on a regular basis by diligent system administrators, will help you discover strange port usage associated with Trojan horses on your system.
For each running process that has an open TCP or UDP port on the network, Fport shows the process ID, process name, port number, and the full pathname of the file that the process ran from on the hard drive. Fport is very simple, yet highly effective. Remember our example in which the attacker renamed Netcat so that it appeared as iexplore. In Figure 6. Why is iexplore. That looks like a problem! Fport tells us that there are a variety of programs using ports on this machine.
All of these ports are pretty normal on a Windows machine, except for the one with a Process ID Pid of It's called iexplore. That just doesn't look right! Unfortunately, this kind of analysis requires an administrator to be intimately familiar with what is supposed to be running on the system. That way, if a counterfeit pops up, an administrator can quickly identify it and investigate.
This can be very difficult, but rock-solid system administrators should have a gut feel for what is installed and running on critical systems. If an experienced sys admin notifies you that "something just doesn't look right with this program," you ignore their concerns at your own peril.
Your best bet is to analyze suspect programs in a laboratory environment to determine if they are attempting to access files or the network unexpectedly. In Chapter 11, we'll discuss a recommended laboratory environment and analysis process you can use to pinpoint problematic software. Another defense for these Trojan naming schemes is to block executable e-mail attachments at your Internet gateway. You should filter out all programs that are potentially executable. These include the familiar EXE programs, but go well beyond that, too.
In reality, you should filter out at least all of the program types described in Table 6. I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time. Pearson Education, Inc. This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site.
Please note that other Pearson websites and online products and services have their own separate privacy policies. To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:.
For inquiries and questions, we collect the inquiry or question, together with name, contact details email address, phone number and mailing address and any other additional information voluntarily submitted to us through a Contact Us form or an email.
We use this information to address the inquiry and respond to the question. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.
Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.
Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing.
Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law. If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information informit. On rare occasions it is necessary to send out a strictly service related announcement.
For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature. We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.
Pearson automatically collects log data to help ensure the delivery, availability and security of this site. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources. Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site.
While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson but not the third party web trend services to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.
This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising.
Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site. Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.
Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time. If a user's personally identifiable information changes such as your postal address or email address , we provide a way to correct or update that user's personal data provided to us.
This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service informit. Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT.
If you choose to remove yourself from our mailing list s simply visit the following page and uncheck any communication you no longer want to receive: www. While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest pearson.
California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.
This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site. Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.
We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements.
This scanner is free and will always remain free for our website's users. This file is not matched with any known malware in the database. You can either do a full real-time scan of the file or skip it to upload a new file. Doing a full scan with 64 antivirus programs can take up to minutes per file. Full Scan Upload New File. Upload File.
Analyzing 0 s. By submitting data to it, you agree to their Terms of Service and Privacy Policy , and to the sharing of your sample submission with the security community. Please do not submit files with personal information if you do not want them to be shared.
Brandon Skies Brandon is a researcher and content creator in the fields of cyber-security and virtual privacy. It will send multiple requests from a computer or a group of computers to overwhelm a target web address and cause a denial of service. Downloader Trojan : A downloader Trojan targets a computer that has already been infected by malware, then downloads and installs more malicious programs to it.
This could be additional Trojans or other types of malware like adware. Exploit Trojan : An exploit malware program contains code or data that takes advantage of specific vulnerabilities within an application or computer system. The cyber criminal will target users through a method like a phishing attack, then use the code in the program to exploit a known vulnerability.
Fake antivirus Trojan : A fake antivirus Trojan simulates the actions of legitimate antivirus software. The Trojan is designed to detect and remove threats like a regular antivirus program, then extort money from users for removing threats that may be nonexistent. Game-thief Trojan : A game-thief Trojan is specifically designed to steal user account information from people playing online games. Infostealer Trojan : This malware can either be used to install Trojans or prevent the user from detecting the existence of a malicious program.
The components of infostealer Trojans can make it difficult for antivirus systems to discover them in scans. Mailfinder Trojan : A mailfinder Trojan aims to harvest and steal email addresses that have been stored on a computer. The attacker will then hold the user or organization ransom until they pay a ransom fee to undo the device damage or unlock the affected data.
The cyber criminal maintains access to the device through a remote network connection, which they use to steal information or spy on a user. Its purpose is to stop malicious programs from being detected, which enables malware to remain active on an infected computer for a longer period.
This includes logging their keyboard actions, taking screenshots, accessing the applications they use, and tracking login data. Victims were compromised by trojanized versions of a legitimate SolarWinds digitally signed file named: SolarWinds. The trojanized file is a backdoor. Once on a target machine, it remains dormant for a two-week period and will then retrieve commands that allow it to transfer, execute, perform reconnaissance, reboot and halt system services.
Communication occurs over http to predetermined URI's. How To Recognize a Trojan Virus.
0コメント