What is a Logic Bomb?

以下が翻訳結果です： "Summary Logic bombs are embedded in software and activate when specific conditions are met, making detection difficult. Insiders often create logic bombs targeting specific entities and hide them within other malware. To detect and prevent logic bombs, code reviews to guard against malicious code and monitoring for unusual software behavior are necessary. Notable types of malware, such as viruses, trojans, and worms, are generally well-known. However, logic bombs may be less common because they are unlikely to affect ordinary people. So, what are they? What is a Logic Bomb? The concept of a logic bomb is actually very simple. The malicious code is embedded in software that is usually not noticed. The code waits until specific conditions are met before detonating and sending its payload. Logic bombs are particularly threatening because they remain inactive until programmed conditions are met, unlike malware like viruses that try to spread themselves and act suspiciously towards antivirus software. Logic bombs are typically designed to attack specific targets, so there is no equivalent to virus signatures. How Logic Bombs Function and Are Triggered Programmers create logic bombs that wait until a specific condition occurs, such as a certain date and time arriving, a specific file being deleted, or a specific user logging into the workstation. One reason this form of malware can be difficult to handle is because it is so specific. Logic bombs are often created by insiders with specific grievances or targets in mind. Their target could be a person, a company, or anything else that the bomb maker wants to define. It's important for logic bombs to serve as payloads for other types of malware. For example, viruses and trojans can infect systems, install logic bombs, and then delete themselves. Examples of Successful Logic Bomb Attacks There have been several examples of successful logic bombs in history. One of the most recent was the discovery in 2023 that Newag trains were programmed to break down if the GPS reported they were being serviced at a competitor's workshop. In 2013, a logic bomb simultaneously wiped the hard drives of three South Korean banks and two media companies. In 2008, a logic bomb was discovered in the IT infrastructure of American mortgage company Fannie Mae. If it had been triggered, all of the company's servers would have been deleted." How to Detect and Prevent Logic Bombs The detection of logic bombs is difficult, and preventing them may be even more challenging. There is no magic software for this, but there are several methods to catch them before they trigger. Code reviews are crucial to prevent malicious code from being included in software. This is especially important if you or your company write your own software, or if many people have access to the source code. As I mentioned earlier, disgruntled programmers or former employees often accidentally introduce logic bombs that continue to activate afterward. In some cases, it may also take too long to attribute a logic bomb to an individual. Monitoring for unusual software behavior is another method to detect logic bombs, but this can also be difficult. Some logic bomb payloads may not trigger warnings immediately. The most important method to prevent the damage caused by logic bombs is proactive defense. This includes screening people who have access to program code, as well as general security standards (such as training people not to download random software from the internet).